diff --git a/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache b/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
index 4fbaf983be8..08b43352e48 100644
--- a/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/jackson_annotations.mustache
@@ -4,7 +4,7 @@
  * If the field is required, always include it, even if it is null.
  * Else use custom behaviour, IOW use whatever is defined on the object mapper
  }}
-  @JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}})
+  @JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{#isNullable}}false{{/isNullable}}{{^isNullable}}{{required}}{{/isNullable}})
   @JsonInclude({{#isMap}}{{#items.isNullable}}content = JsonInclude.Include.ALWAYS, {{/items.isNullable}}{{/isMap}}value = JsonInclude.Include.{{#required}}ALWAYS{{/required}}{{^required}}USE_DEFAULTS{{/required}})
 {{#withXml}}
   @JacksonXmlProperty(localName = "{{items.xmlName}}{{^items.xmlName}}{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}{{/items.xmlName}}"{{#isXmlAttribute}}, isAttribute = true{{/isXmlAttribute}}{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}})
diff --git a/modules/openapi-generator/src/main/resources/Java/pojo.mustache b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
index ebdea8b6192..d4133686321 100644
--- a/modules/openapi-generator/src/main/resources/Java/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
@@ -115,7 +115,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{#jsonb}}@JsonbCreator{{/jsonb}}{{#jackson}}@JsonCreator{{/jackson}}
   public {{classname}}(
   {{#readOnlyVars}}
-    {{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}
+    {{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{#isNullable}}false{{/isNullable}}{{^isNullable}}{{required}}{{/isNullable}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}
   {{/readOnlyVars}}
   ) {
     this();
@@ -130,7 +130,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   /**
    * Constructor with all args parameters
    */
-  public {{classname}}({{#vendorExtensions.x-java-all-args-constructor-vars}}{{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}{{/vendorExtensions.x-java-all-args-constructor-vars}}) {
+  public {{classname}}({{#vendorExtensions.x-java-all-args-constructor-vars}}{{#jsonb}}@JsonbProperty(value = "{{baseName}}"{{^required}}, nullable = true{{/required}}){{/jsonb}}{{#jackson}}@JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{#isNullable}}false{{/isNullable}}{{^isNullable}}{{required}}{{/isNullable}}){{/jackson}} {{{datatypeWithEnum}}} {{name}}{{^-last}}, {{/-last}}{{/vendorExtensions.x-java-all-args-constructor-vars}}) {
 {{#parent}}
     super({{#parentVars}}{{name}}{{^-last}}, {{/-last}}{{/parentVars}});
 {{/parent}}
@@ -261,7 +261,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     return {{name}};
   }
   {{/vendorExtensions.x-is-jackson-optional-nullable}}{{#vendorExtensions.x-is-jackson-optional-nullable}}
-  @JsonProperty(JSON_PROPERTY_{{nameInSnakeCase}})
+  @JsonProperty(value = JSON_PROPERTY_{{nameInSnakeCase}}, required = {{#isNullable}}false{{/isNullable}}{{^isNullable}}{{required}}{{/isNullable}})
   {{#isReadOnly}}private{{/isReadOnly}}{{^isReadOnly}}public{{/isReadOnly}} void {{setter}}_JsonNullable(JsonNullable<{{{datatypeWithEnum}}}> {{name}}) {
     {{! For getters/setters that have name differing from attribute name, we must include setter (albeit private) for jackson to be able to set the attribute}}
     this.{{name}} = {{name}};
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
index 24d02b510e8..8eed5697e12 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java
@@ -2113,10 +2113,10 @@ public class JavaClientCodegenTest {
         assertFileContains(
                 output.resolve("src/main/java/org/openapitools/client/model/BigDog.java"),
                 "@Deprecated\n public BigDog declawed(@jakarta.annotation.Nullable Boolean declawed) {", // deprecated builder method
-                "@Deprecated\n @jakarta.annotation.Nullable\n @JsonProperty(JSON_PROPERTY_DECLAWED)\n"
+                "@Deprecated\n @jakarta.annotation.Nullable\n @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)\n"
                         + " @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)\n\n"
                         + " public Boolean getDeclawed() {", // deprecated getter
-                "@Deprecated\n @JsonProperty(JSON_PROPERTY_DECLAWED)\n"
+                "@Deprecated\n @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)\n"
                         + " @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)\n"
                         + " public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {" // deprecated setter
         );
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
index 06f845179a2..287ecef8644 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Bird.java
@@ -58,7 +58,7 @@ public class Bird {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -66,7 +66,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -83,7 +83,7 @@ public class Bird {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -91,7 +91,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
index 7ff4ce49257..030cf4d7e99 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
index 90b54a66761..174b0af6b3c 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -69,7 +69,7 @@ public class DataQuery extends Query {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -77,7 +77,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -94,7 +94,7 @@ public class DataQuery extends Query {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -102,7 +102,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -119,7 +119,7 @@ public class DataQuery extends Query {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -127,7 +127,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
index 0d7cb986a72..d25c334efe1 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -141,7 +141,7 @@ public class DefaultValue {
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -149,7 +149,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -174,7 +174,7 @@ public class DefaultValue {
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -182,7 +182,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -207,7 +207,7 @@ public class DefaultValue {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -215,7 +215,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -240,7 +240,7 @@ public class DefaultValue {
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -248,7 +248,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -273,7 +273,7 @@ public class DefaultValue {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -281,7 +281,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -316,14 +316,14 @@ public class DefaultValue {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
     return arrayStringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   public void setArrayStringNullable_JsonNullable(JsonNullable<List<String>> arrayStringNullable) {
     this.arrayStringNullable = arrayStringNullable;
   }
@@ -361,14 +361,14 @@ public class DefaultValue {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
     return arrayStringExtensionNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   public void setArrayStringExtensionNullable_JsonNullable(JsonNullable<List<String>> arrayStringExtensionNullable) {
     this.arrayStringExtensionNullable = arrayStringExtensionNullable;
   }
@@ -394,14 +394,14 @@ public class DefaultValue {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
     return stringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   public void setStringNullable_JsonNullable(JsonNullable<String> stringNullable) {
     this.stringNullable = stringNullable;
   }
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 7ea3b30b998..106b8e39628 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -64,7 +64,7 @@ public class NumberPropertiesOnly {
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -72,7 +72,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -89,7 +89,7 @@ public class NumberPropertiesOnly {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -97,7 +97,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -116,7 +116,7 @@ public class NumberPropertiesOnly {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -124,7 +124,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
index 4da18d65512..7cf1c57c228 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -170,7 +170,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
index dcf399eec9f..df8b7c3b43b 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Query.java
@@ -98,7 +98,7 @@ public class Query {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -106,7 +106,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -131,7 +131,7 @@ public class Query {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -139,7 +139,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
index f01968cbe72..46e7343d3f6 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index 684501f2e16..1ba68fe32b3 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -54,7 +54,7 @@ public class TestFormObjectMultipartRequestMarker {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class TestFormObjectMultipartRequestMarker {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index ecb9756d320..cb765eb8ac8 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -69,7 +69,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -77,7 +77,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -94,7 +94,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -102,7 +102,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -119,7 +119,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -152,7 +152,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index 7e08f171879..f488461482a 100644
--- a/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -65,7 +65,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -73,7 +73,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
index c9f37623bef..9a2246b06be 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Bird.java
@@ -60,14 +60,14 @@ public class Bird {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSize() {
     return size;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -84,14 +84,14 @@ public class Bird {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
index c2a9d52f544..ff125f83430 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Category.java
@@ -60,14 +60,14 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
index cf48072fc78..0fab96204b0 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -69,14 +69,14 @@ public class DataQuery extends Query {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSuffix() {
     return suffix;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -93,14 +93,14 @@ public class DataQuery extends Query {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getText() {
     return text;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -117,14 +117,14 @@ public class DataQuery extends Query {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Instant getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable Instant date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
index 679a8ca4d55..418a35cde77 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -139,14 +139,14 @@ public class DefaultValue {
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
     return arrayStringEnumRefDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -171,14 +171,14 @@ public class DefaultValue {
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
     return arrayStringEnumDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -203,14 +203,14 @@ public class DefaultValue {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayStringDefault() {
     return arrayStringDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -235,14 +235,14 @@ public class DefaultValue {
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Integer> getArrayIntegerDefault() {
     return arrayIntegerDefault;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -267,14 +267,14 @@ public class DefaultValue {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayString() {
     return arrayString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -308,7 +308,7 @@ public class DefaultValue {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
@@ -352,7 +352,7 @@ public class DefaultValue {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
@@ -384,7 +384,7 @@ public class DefaultValue {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index db637a9ca16..dd4bcf0d66a 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -66,14 +66,14 @@ public class NumberPropertiesOnly {
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -90,14 +90,14 @@ public class NumberPropertiesOnly {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -116,14 +116,14 @@ public class NumberPropertiesOnly {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
index bc3827be1d1..5971623b8b2 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,14 +121,14 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,14 +145,14 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -169,14 +169,14 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -201,14 +201,14 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,14 +233,14 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -257,14 +257,14 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
index ce8c1ffee8b..d5f21fb4e84 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Query.java
@@ -99,14 +99,14 @@ public class Query {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -131,14 +131,14 @@ public class Query {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<OutcomesEnum> getOutcomes() {
     return outcomes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
index 3f6bb18404a..11c0fcc0d9a 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,14 +60,14 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index 24ed53ddf36..af0e0282c12 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -55,14 +55,14 @@ public class TestFormObjectMultipartRequestMarker {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 5a3763185c2..558b7f67607 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -70,14 +70,14 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSize() {
     return size;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -94,14 +94,14 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -118,14 +118,14 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,14 +142,14 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index 5b7c704af8a..91f8863eb49 100644
--- a/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/native/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -65,14 +65,14 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getValues() {
     return values;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
index 975a9dc431a..9cf4ddddde5 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Bird.java
@@ -55,7 +55,7 @@ public class Bird {
    * @return size
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -63,7 +63,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@jakarta.annotation.Nullable String size) {
     this.size = size;
@@ -80,7 +80,7 @@ public class Bird {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -88,7 +88,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
index 60c02f39fd2..cfb1aa573e6 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
index bd54ecdb3d1..ec3e1cafa39 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -66,7 +66,7 @@ public class DataQuery extends Query {
    * @return suffix
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -74,7 +74,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@jakarta.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -91,7 +91,7 @@ public class DataQuery extends Query {
    * @return text
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -99,7 +99,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@jakarta.annotation.Nullable String text) {
     this.text = text;
@@ -116,7 +116,7 @@ public class DataQuery extends Query {
    * @return date
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Instant getDate() {
@@ -124,7 +124,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@jakarta.annotation.Nullable Instant date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
index c766f20bab5..4b3af80aa83 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -138,7 +138,7 @@ public class DefaultValue {
    * @return arrayStringEnumRefDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -146,7 +146,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@jakarta.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -171,7 +171,7 @@ public class DefaultValue {
    * @return arrayStringEnumDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -179,7 +179,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@jakarta.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -204,7 +204,7 @@ public class DefaultValue {
    * @return arrayStringDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -212,7 +212,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@jakarta.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -237,7 +237,7 @@ public class DefaultValue {
    * @return arrayIntegerDefault
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -245,7 +245,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@jakarta.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -270,7 +270,7 @@ public class DefaultValue {
    * @return arrayString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -278,7 +278,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@jakarta.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -313,7 +313,7 @@ public class DefaultValue {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
@@ -358,7 +358,7 @@ public class DefaultValue {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
@@ -391,7 +391,7 @@ public class DefaultValue {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index cbf77a4fabf..1f9167f5f41 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -61,7 +61,7 @@ public class NumberPropertiesOnly {
    * @return number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -69,7 +69,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@jakarta.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -86,7 +86,7 @@ public class NumberPropertiesOnly {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -94,7 +94,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -113,7 +113,7 @@ public class NumberPropertiesOnly {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -121,7 +121,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
index 53f76bd6635..f863d56ecdb 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -117,7 +117,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -150,7 +150,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -167,7 +167,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -175,7 +175,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -200,7 +200,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -208,7 +208,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,7 +233,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -241,7 +241,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -258,7 +258,7 @@ public class Pet {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -266,7 +266,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
index 52509751063..142b9f0744f 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Query.java
@@ -95,7 +95,7 @@ public class Query {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -103,7 +103,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class Query {
    * @return outcomes
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -136,7 +136,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@jakarta.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
index 562ef208f48..86d03332dd8 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index 024aaf6963f..b336d2c6c63 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -51,7 +51,7 @@ public class TestFormObjectMultipartRequestMarker {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public class TestFormObjectMultipartRequestMarker {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index a1db893f4a9..9260a135430 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -66,7 +66,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return size
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -74,7 +74,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@jakarta.annotation.Nullable String size) {
     this.size = size;
@@ -91,7 +91,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -99,7 +99,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
@@ -116,7 +116,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index aab92b39e28..1c5990fd0e5 100644
--- a/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/restclient/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -62,7 +62,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
    * @return values
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -70,7 +70,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@jakarta.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
index 92b238e34d8..9927effbdf3 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Bird.java
@@ -55,7 +55,7 @@ public class Bird {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -63,7 +63,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -80,7 +80,7 @@ public class Bird {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -88,7 +88,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
index 9e869527523..f367d726a60 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
index 5aa8add6f33..3fcaa5787e5 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -66,7 +66,7 @@ public class DataQuery extends Query {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -74,7 +74,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -91,7 +91,7 @@ public class DataQuery extends Query {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -99,7 +99,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -116,7 +116,7 @@ public class DataQuery extends Query {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -124,7 +124,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
index 7af76b56beb..4ac5da160be 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -138,7 +138,7 @@ public class DefaultValue {
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -146,7 +146,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -171,7 +171,7 @@ public class DefaultValue {
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -179,7 +179,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -204,7 +204,7 @@ public class DefaultValue {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -212,7 +212,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -237,7 +237,7 @@ public class DefaultValue {
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -245,7 +245,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -270,7 +270,7 @@ public class DefaultValue {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -278,7 +278,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -313,14 +313,14 @@ public class DefaultValue {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
     return arrayStringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   public void setArrayStringNullable_JsonNullable(JsonNullable<List<String>> arrayStringNullable) {
     this.arrayStringNullable = arrayStringNullable;
   }
@@ -358,14 +358,14 @@ public class DefaultValue {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
     return arrayStringExtensionNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   public void setArrayStringExtensionNullable_JsonNullable(JsonNullable<List<String>> arrayStringExtensionNullable) {
     this.arrayStringExtensionNullable = arrayStringExtensionNullable;
   }
@@ -391,14 +391,14 @@ public class DefaultValue {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
     return stringNullable;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   public void setStringNullable_JsonNullable(JsonNullable<String> stringNullable) {
     this.stringNullable = stringNullable;
   }
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 14657e0e4e0..961689a7251 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -61,7 +61,7 @@ public class NumberPropertiesOnly {
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -69,7 +69,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -86,7 +86,7 @@ public class NumberPropertiesOnly {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -94,7 +94,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -113,7 +113,7 @@ public class NumberPropertiesOnly {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -121,7 +121,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
index 7729a46aa72..0d25b5c89a0 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
@@ -117,7 +117,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -150,7 +150,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -167,7 +167,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -175,7 +175,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -200,7 +200,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -208,7 +208,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,7 +233,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -241,7 +241,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -258,7 +258,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -266,7 +266,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
index 9b7df902f31..aee7a4b741e 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Query.java
@@ -95,7 +95,7 @@ public class Query {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -103,7 +103,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class Query {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -136,7 +136,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
index b03f9124789..91cbb67fe4d 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index 78cedabb311..afe1c90764d 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -51,7 +51,7 @@ public class TestFormObjectMultipartRequestMarker {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public class TestFormObjectMultipartRequestMarker {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index 514b4452f39..ebd388bc597 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -66,7 +66,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -74,7 +74,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -91,7 +91,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -99,7 +99,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -116,7 +116,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index 7ea59823aab..9285a8e5af9 100644
--- a/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resteasy/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -62,7 +62,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -70,7 +70,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
index fc1c8ed702b..fdc99c7e2e3 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Bird.java
@@ -55,7 +55,7 @@ public class Bird {
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -63,7 +63,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -80,7 +80,7 @@ public class Bird {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -88,7 +88,7 @@ public class Bird {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
index af06f2102b3..54489761ada 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
index bedeac2de31..d07329c2076 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DataQuery.java
@@ -66,7 +66,7 @@ public class DataQuery extends Query {
    * @return suffix
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSuffix() {
@@ -74,7 +74,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SUFFIX)
+  @JsonProperty(value = JSON_PROPERTY_SUFFIX, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSuffix(@javax.annotation.Nullable String suffix) {
     this.suffix = suffix;
@@ -91,7 +91,7 @@ public class DataQuery extends Query {
    * @return text
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getText() {
@@ -99,7 +99,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TEXT)
+  @JsonProperty(value = JSON_PROPERTY_TEXT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setText(@javax.annotation.Nullable String text) {
     this.text = text;
@@ -116,7 +116,7 @@ public class DataQuery extends Query {
    * @return date
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDate() {
@@ -124,7 +124,7 @@ public class DataQuery extends Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDate(@javax.annotation.Nullable OffsetDateTime date) {
     this.date = date;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
index 055b607a458..6242b44fbe3 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/DefaultValue.java
@@ -138,7 +138,7 @@ public class DefaultValue {
    * @return arrayStringEnumRefDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<StringEnumRef> getArrayStringEnumRefDefault() {
@@ -146,7 +146,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_REF_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumRefDefault(@javax.annotation.Nullable List<StringEnumRef> arrayStringEnumRefDefault) {
     this.arrayStringEnumRefDefault = arrayStringEnumRefDefault;
@@ -171,7 +171,7 @@ public class DefaultValue {
    * @return arrayStringEnumDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayStringEnumDefaultEnum> getArrayStringEnumDefault() {
@@ -179,7 +179,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_ENUM_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringEnumDefault(@javax.annotation.Nullable List<ArrayStringEnumDefaultEnum> arrayStringEnumDefault) {
     this.arrayStringEnumDefault = arrayStringEnumDefault;
@@ -204,7 +204,7 @@ public class DefaultValue {
    * @return arrayStringDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayStringDefault() {
@@ -212,7 +212,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayStringDefault(@javax.annotation.Nullable List<String> arrayStringDefault) {
     this.arrayStringDefault = arrayStringDefault;
@@ -237,7 +237,7 @@ public class DefaultValue {
    * @return arrayIntegerDefault
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getArrayIntegerDefault() {
@@ -245,7 +245,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_INTEGER_DEFAULT)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_INTEGER_DEFAULT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayIntegerDefault(@javax.annotation.Nullable List<Integer> arrayIntegerDefault) {
     this.arrayIntegerDefault = arrayIntegerDefault;
@@ -270,7 +270,7 @@ public class DefaultValue {
    * @return arrayString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayString() {
@@ -278,7 +278,7 @@ public class DefaultValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayString(@javax.annotation.Nullable List<String> arrayString) {
     this.arrayString = arrayString;
@@ -313,7 +313,7 @@ public class DefaultValue {
         return arrayStringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringNullable_JsonNullable() {
@@ -358,7 +358,7 @@ public class DefaultValue {
         return arrayStringExtensionNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_STRING_EXTENSION_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<String>> getArrayStringExtensionNullable_JsonNullable() {
@@ -391,7 +391,7 @@ public class DefaultValue {
         return stringNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_STRING_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringNullable_JsonNullable() {
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
index 96f2b15e7df..e73bb900357 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/NumberPropertiesOnly.java
@@ -61,7 +61,7 @@ public class NumberPropertiesOnly {
    * @return number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNumber() {
@@ -69,7 +69,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumber(@javax.annotation.Nullable BigDecimal number) {
     this.number = number;
@@ -86,7 +86,7 @@ public class NumberPropertiesOnly {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -94,7 +94,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -113,7 +113,7 @@ public class NumberPropertiesOnly {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -121,7 +121,7 @@ public class NumberPropertiesOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
index 5d5a9fa3328..2ae97ad1f46 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
@@ -117,7 +117,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -150,7 +150,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -167,7 +167,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -175,7 +175,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -200,7 +200,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -208,7 +208,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,7 +233,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -241,7 +241,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -258,7 +258,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -266,7 +266,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
index 91067f5033a..b2c48ed0e3d 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Query.java
@@ -95,7 +95,7 @@ public class Query {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -103,7 +103,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class Query {
    * @return outcomes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<OutcomesEnum> getOutcomes() {
@@ -136,7 +136,7 @@ public class Query {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTCOMES)
+  @JsonProperty(value = JSON_PROPERTY_OUTCOMES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOutcomes(@javax.annotation.Nullable List<OutcomesEnum> outcomes) {
     this.outcomes = outcomes;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
index a64fb501fb8..12b03c2c443 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
index af1486a506e..64a7ecdf3d0 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java
@@ -51,7 +51,7 @@ public class TestFormObjectMultipartRequestMarker {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -59,7 +59,7 @@ public class TestFormObjectMultipartRequestMarker {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
index af4cd985430..53d9f24c15e 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.java
@@ -66,7 +66,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return size
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSize() {
@@ -74,7 +74,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSize(@javax.annotation.Nullable String size) {
     this.size = size;
@@ -91,7 +91,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -99,7 +99,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
@@ -116,7 +116,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -149,7 +149,7 @@ public class TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
index d3be005a7fd..61dcd19032d 100644
--- a/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
+++ b/samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.java
@@ -62,7 +62,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
    * @return values
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getValues() {
@@ -70,7 +70,7 @@ public class TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUES)
+  @JsonProperty(value = JSON_PROPERTY_VALUES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValues(@javax.annotation.Nullable List<String> values) {
     this.values = values;
diff --git a/samples/client/others/java/restclient-enum-in-multipart/src/main/java/org/openapitools/client/model/InlineObject.java b/samples/client/others/java/restclient-enum-in-multipart/src/main/java/org/openapitools/client/model/InlineObject.java
index c61a3ccf369..9d9ebad9f2c 100644
--- a/samples/client/others/java/restclient-enum-in-multipart/src/main/java/org/openapitools/client/model/InlineObject.java
+++ b/samples/client/others/java/restclient-enum-in-multipart/src/main/java/org/openapitools/client/model/InlineObject.java
@@ -52,7 +52,7 @@ public class InlineObject {
    * @return messageId
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_MESSAGE_ID)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE_ID, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public UUID getMessageId() {
@@ -60,7 +60,7 @@ public class InlineObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE_ID)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE_ID, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setMessageId(@jakarta.annotation.Nonnull UUID messageId) {
     this.messageId = messageId;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Addressable.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Addressable.java
index 7320a079ff4..038f3b1c930 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Addressable.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Addressable.java
@@ -55,7 +55,7 @@ public class Addressable {
    * @return href
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getHref() {
@@ -63,7 +63,7 @@ public class Addressable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHref(@javax.annotation.Nullable String href) {
     this.href = href;
@@ -80,7 +80,7 @@ public class Addressable {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getId() {
@@ -88,7 +88,7 @@ public class Addressable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable String id) {
     this.id = id;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Apple.java
index 7372ae0f030..43da5bb89f7 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Apple.java
@@ -58,7 +58,7 @@ public final class Apple implements Fruit {
    * @return seeds
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SEEDS)
+  @JsonProperty(value = JSON_PROPERTY_SEEDS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getSeeds() {
@@ -66,7 +66,7 @@ public final class Apple implements Fruit {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SEEDS)
+  @JsonProperty(value = JSON_PROPERTY_SEEDS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setSeeds(@javax.annotation.Nonnull Integer seeds) {
     this.seeds = seeds;
@@ -83,7 +83,7 @@ public final class Apple implements Fruit {
    * @return fruitType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FRUIT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_FRUIT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public FruitType getFruitType() {
@@ -91,7 +91,7 @@ public final class Apple implements Fruit {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FRUIT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_FRUIT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFruitType(@javax.annotation.Nonnull FruitType fruitType) {
     this.fruitType = fruitType;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Banana.java
index 9eedf912aa3..ef87516eed7 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Banana.java
@@ -58,7 +58,7 @@ public final class Banana implements Fruit {
    * @return length
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getLength() {
@@ -66,7 +66,7 @@ public final class Banana implements Fruit {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLength(@javax.annotation.Nonnull Integer length) {
     this.length = length;
@@ -83,7 +83,7 @@ public final class Banana implements Fruit {
    * @return fruitType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FRUIT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_FRUIT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public FruitType getFruitType() {
@@ -91,7 +91,7 @@ public final class Banana implements Fruit {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FRUIT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_FRUIT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFruitType(@javax.annotation.Nonnull FruitType fruitType) {
     this.fruitType = fruitType;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Bar.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Bar.java
index c68aad46c5a..85849876b36 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Bar.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Bar.java
@@ -77,7 +77,7 @@ public final class Bar extends Entity implements BarRefOrValue {
    * @return id
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getId() {
@@ -85,7 +85,7 @@ public final class Bar extends Entity implements BarRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setId(@javax.annotation.Nonnull String id) {
     this.id = id;
@@ -102,7 +102,7 @@ public final class Bar extends Entity implements BarRefOrValue {
    * @return barPropA
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_BAR_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBarPropA() {
@@ -110,7 +110,7 @@ public final class Bar extends Entity implements BarRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_BAR_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBarPropA(@javax.annotation.Nullable String barPropA) {
     this.barPropA = barPropA;
@@ -127,7 +127,7 @@ public final class Bar extends Entity implements BarRefOrValue {
    * @return fooPropB
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFooPropB() {
@@ -135,7 +135,7 @@ public final class Bar extends Entity implements BarRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFooPropB(@javax.annotation.Nullable String fooPropB) {
     this.fooPropB = fooPropB;
@@ -152,7 +152,7 @@ public final class Bar extends Entity implements BarRefOrValue {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public FooRefOrValue getFoo() {
@@ -160,7 +160,7 @@ public final class Bar extends Entity implements BarRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFoo(@javax.annotation.Nullable FooRefOrValue foo) {
     this.foo = foo;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/BarCreate.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/BarCreate.java
index dc8b590e4e7..bde7fe3bdef 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/BarCreate.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/BarCreate.java
@@ -73,7 +73,7 @@ public class BarCreate extends Entity {
    * @return barPropA
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_BAR_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBarPropA() {
@@ -81,7 +81,7 @@ public class BarCreate extends Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_BAR_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBarPropA(@javax.annotation.Nullable String barPropA) {
     this.barPropA = barPropA;
@@ -98,7 +98,7 @@ public class BarCreate extends Entity {
    * @return fooPropB
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFooPropB() {
@@ -106,7 +106,7 @@ public class BarCreate extends Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFooPropB(@javax.annotation.Nullable String fooPropB) {
     this.fooPropB = fooPropB;
@@ -123,7 +123,7 @@ public class BarCreate extends Entity {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public FooRefOrValue getFoo() {
@@ -131,7 +131,7 @@ public class BarCreate extends Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFoo(@javax.annotation.Nullable FooRefOrValue foo) {
     this.foo = foo;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Entity.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Entity.java
index 01290f52d13..a60e9b783b8 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Entity.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Entity.java
@@ -87,7 +87,7 @@ public class Entity {
    * @return href
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getHref() {
@@ -95,7 +95,7 @@ public class Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHref(@javax.annotation.Nullable String href) {
     this.href = href;
@@ -112,7 +112,7 @@ public class Entity {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getId() {
@@ -120,7 +120,7 @@ public class Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable String id) {
     this.id = id;
@@ -137,7 +137,7 @@ public class Entity {
    * @return atSchemaLocation
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtSchemaLocation() {
@@ -145,7 +145,7 @@ public class Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtSchemaLocation(@javax.annotation.Nullable String atSchemaLocation) {
     this.atSchemaLocation = atSchemaLocation;
@@ -162,7 +162,7 @@ public class Entity {
    * @return atBaseType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtBaseType() {
@@ -170,7 +170,7 @@ public class Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtBaseType(@javax.annotation.Nullable String atBaseType) {
     this.atBaseType = atBaseType;
@@ -187,7 +187,7 @@ public class Entity {
    * @return atType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getAtType() {
@@ -195,7 +195,7 @@ public class Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setAtType(@javax.annotation.Nonnull String atType) {
     this.atType = atType;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/EntityRef.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/EntityRef.java
index bd81921d4a5..0ba18979052 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/EntityRef.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/EntityRef.java
@@ -93,7 +93,7 @@ public class EntityRef {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -101,7 +101,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -118,7 +118,7 @@ public class EntityRef {
    * @return atReferredType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_REFERRED_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_REFERRED_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtReferredType() {
@@ -126,7 +126,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_REFERRED_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_REFERRED_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtReferredType(@javax.annotation.Nullable String atReferredType) {
     this.atReferredType = atReferredType;
@@ -143,7 +143,7 @@ public class EntityRef {
    * @return href
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getHref() {
@@ -151,7 +151,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HREF)
+  @JsonProperty(value = JSON_PROPERTY_HREF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHref(@javax.annotation.Nullable String href) {
     this.href = href;
@@ -168,7 +168,7 @@ public class EntityRef {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getId() {
@@ -176,7 +176,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable String id) {
     this.id = id;
@@ -193,7 +193,7 @@ public class EntityRef {
    * @return atSchemaLocation
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtSchemaLocation() {
@@ -201,7 +201,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtSchemaLocation(@javax.annotation.Nullable String atSchemaLocation) {
     this.atSchemaLocation = atSchemaLocation;
@@ -218,7 +218,7 @@ public class EntityRef {
    * @return atBaseType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtBaseType() {
@@ -226,7 +226,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtBaseType(@javax.annotation.Nullable String atBaseType) {
     this.atBaseType = atBaseType;
@@ -243,7 +243,7 @@ public class EntityRef {
    * @return atType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getAtType() {
@@ -251,7 +251,7 @@ public class EntityRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setAtType(@javax.annotation.Nonnull String atType) {
     this.atType = atType;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Extensible.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Extensible.java
index c6dc4fd549e..a0f2b6a9ebc 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Extensible.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Extensible.java
@@ -60,7 +60,7 @@ public class Extensible {
    * @return atSchemaLocation
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtSchemaLocation() {
@@ -68,7 +68,7 @@ public class Extensible {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_SCHEMA_LOCATION)
+  @JsonProperty(value = JSON_PROPERTY_AT_SCHEMA_LOCATION, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtSchemaLocation(@javax.annotation.Nullable String atSchemaLocation) {
     this.atSchemaLocation = atSchemaLocation;
@@ -85,7 +85,7 @@ public class Extensible {
    * @return atBaseType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAtBaseType() {
@@ -93,7 +93,7 @@ public class Extensible {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_BASE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_BASE_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAtBaseType(@javax.annotation.Nullable String atBaseType) {
     this.atBaseType = atBaseType;
@@ -110,7 +110,7 @@ public class Extensible {
    * @return atType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getAtType() {
@@ -118,7 +118,7 @@ public class Extensible {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_AT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_AT_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setAtType(@javax.annotation.Nonnull String atType) {
     this.atType = atType;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Foo.java
index 9789f3302d0..96bb226467f 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Foo.java
@@ -66,7 +66,7 @@ public final class Foo extends Entity implements FooRefOrValue {
    * @return fooPropA
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFooPropA() {
@@ -74,7 +74,7 @@ public final class Foo extends Entity implements FooRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFooPropA(@javax.annotation.Nullable String fooPropA) {
     this.fooPropA = fooPropA;
@@ -91,7 +91,7 @@ public final class Foo extends Entity implements FooRefOrValue {
    * @return fooPropB
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFooPropB() {
@@ -99,7 +99,7 @@ public final class Foo extends Entity implements FooRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOO_PROP_B)
+  @JsonProperty(value = JSON_PROPERTY_FOO_PROP_B, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFooPropB(@javax.annotation.Nullable String fooPropB) {
     this.fooPropB = fooPropB;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/FooRef.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/FooRef.java
index 08dd57fe170..63681ab8116 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/FooRef.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/FooRef.java
@@ -61,7 +61,7 @@ public final class FooRef extends EntityRef implements FooRefOrValue {
    * @return foorefPropA
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOOREF_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_FOOREF_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoorefPropA() {
@@ -69,7 +69,7 @@ public final class FooRef extends EntityRef implements FooRefOrValue {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FOOREF_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_FOOREF_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFoorefPropA(@javax.annotation.Nullable String foorefPropA) {
     this.foorefPropA = foorefPropA;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pasta.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pasta.java
index 8fc0889dc0a..7b2403ee739 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pasta.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pasta.java
@@ -61,7 +61,7 @@ public class Pasta extends Entity {
    * @return vendor
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_VENDOR)
+  @JsonProperty(value = JSON_PROPERTY_VENDOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getVendor() {
@@ -69,7 +69,7 @@ public class Pasta extends Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VENDOR)
+  @JsonProperty(value = JSON_PROPERTY_VENDOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setVendor(@javax.annotation.Nullable String vendor) {
     this.vendor = vendor;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pizza.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pizza.java
index 6d278481922..66f7254fbe3 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pizza.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/Pizza.java
@@ -65,7 +65,7 @@ public class Pizza extends Entity {
    * @return pizzaSize
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PIZZA_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_PIZZA_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPizzaSize() {
@@ -73,7 +73,7 @@ public class Pizza extends Entity {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PIZZA_SIZE)
+  @JsonProperty(value = JSON_PROPERTY_PIZZA_SIZE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPizzaSize(@javax.annotation.Nullable BigDecimal pizzaSize) {
     this.pizzaSize = pizzaSize;
diff --git a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/PizzaSpeziale.java b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/PizzaSpeziale.java
index cdf3b3e91b6..90617497ff7 100644
--- a/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/PizzaSpeziale.java
+++ b/samples/client/others/java/webclient-sealedInterface/src/main/java/org/openapitools/client/model/PizzaSpeziale.java
@@ -62,7 +62,7 @@ public class PizzaSpeziale extends Pizza {
    * @return toppings
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TOPPINGS)
+  @JsonProperty(value = JSON_PROPERTY_TOPPINGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getToppings() {
@@ -70,7 +70,7 @@ public class PizzaSpeziale extends Pizza {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TOPPINGS)
+  @JsonProperty(value = JSON_PROPERTY_TOPPINGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setToppings(@javax.annotation.Nullable String toppings) {
     this.toppings = toppings;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 6e02ac8143e..b9674ea5f83 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -68,7 +68,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -76,7 +76,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -101,7 +101,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -109,7 +109,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 1a4fd7c8fcf..372c3fdfbd6 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -59,7 +59,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -67,7 +67,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -84,7 +84,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -92,7 +92,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
index f2ec7920776..432317e80f9 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -71,7 +71,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -79,7 +79,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 0c1d8e3eba3..3798d7766c8 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -73,7 +73,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index b7f76bcc1d1..4ef1612fdd2 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -73,7 +73,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index 6ae04f80688..9b353d6ccca 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -75,7 +75,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -83,7 +83,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -108,7 +108,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -116,7 +116,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -141,7 +141,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -149,7 +149,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
index 6a4476be146..9763f7117a2 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -78,7 +78,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -86,7 +86,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,7 +103,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -111,7 +111,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -128,7 +128,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -136,7 +136,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -153,7 +153,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -161,7 +161,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -178,7 +178,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -186,7 +186,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -203,7 +203,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -211,7 +211,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
index 23149f0f7b3..73e9e8930f1 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -64,7 +64,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -72,7 +72,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
index 74b16faf896..db17d3c40fb 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index d0cb8f970ae..4ffc3fc8d0c 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -65,7 +65,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -73,7 +73,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
index 2beafc76b73..b7be8bb0964 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
index 1b6d91416fa..79b2d7ab912 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Client.java
@@ -53,7 +53,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -61,7 +61,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index b48b19b391c..e845fee4b12 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -55,7 +55,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -63,7 +63,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
index cd6e9c8d84a..41c51a84bc3 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -64,7 +64,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -72,7 +72,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index 08aa385c696..52ffa0a0c15 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -131,7 +131,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -139,7 +139,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,7 +164,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -172,7 +172,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
index 2bf448cd7d8..ead88027f5e 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -241,7 +241,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -249,7 +249,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -266,7 +266,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -274,7 +274,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -291,7 +291,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -299,7 +299,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -316,7 +316,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -324,7 +324,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -347,14 +347,14 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -374,7 +374,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -382,7 +382,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -399,7 +399,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -407,7 +407,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -424,7 +424,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -432,7 +432,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 6717bcd8740..ebbf32d8b2f 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -62,7 +62,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -70,7 +70,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -95,7 +95,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -103,7 +103,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index d4bff303664..d9e64e21a86 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -62,7 +62,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -70,7 +70,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -95,7 +95,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -103,7 +103,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
index fc6b1be25d1..d723fb6fd2d 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -53,7 +53,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -61,7 +61,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 54dd731e9cc..9cb5f377f19 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -55,7 +55,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -63,7 +63,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 277cb8d190a..e67dffc8f4f 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -136,7 +136,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -144,7 +144,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -163,7 +163,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -171,7 +171,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -188,7 +188,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -196,7 +196,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -215,7 +215,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -223,7 +223,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -242,7 +242,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -250,7 +250,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -269,7 +269,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -277,7 +277,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -294,7 +294,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -302,7 +302,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -319,7 +319,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -327,7 +327,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -344,7 +344,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -352,7 +352,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -369,7 +369,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -377,7 +377,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -394,7 +394,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -402,7 +402,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -419,7 +419,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -427,7 +427,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -444,7 +444,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -452,7 +452,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -469,7 +469,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -477,7 +477,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -494,7 +494,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -502,7 +502,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -519,7 +519,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -527,7 +527,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 6c0ef1bd75b..42f7c8b9fb1 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -52,8 +52,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -65,7 +65,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 43d8408b4fd..dbb0003010e 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -63,14 +63,14 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
index 7b63a9d99b1..c0471df6bff 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -113,7 +113,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -121,7 +121,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -146,7 +146,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -154,7 +154,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -179,7 +179,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -187,7 +187,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -212,7 +212,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -220,7 +220,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 28a1e233ac8..3eb9fa6ce7d 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -68,7 +68,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -76,7 +76,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -93,7 +93,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -101,7 +101,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -126,7 +126,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -134,7 +134,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
index af1e10a74cd..c0eea7937cd 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,7 +84,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -92,7 +92,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 17ce92bcd41..f420579841e 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -114,7 +114,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -122,7 +122,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
index 0a091599895..bf2fd2b993f 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
index ba53e092111..eb26fdd4d37 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -54,7 +54,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -62,7 +62,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index 66420c5ab62..dd708439c5f 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
index 49c8d2e6a60..e09bb76d67f 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Name.java
@@ -61,8 +61,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -80,7 +80,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -88,7 +88,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -99,7 +99,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -119,7 +119,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -127,7 +127,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -138,7 +138,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
index e6ece570c95..7958fb0ccfd 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,14 +127,14 @@ public class NullableClass extends HashMap<String, Object> {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -160,14 +160,14 @@ public class NullableClass extends HashMap<String, Object> {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -193,14 +193,14 @@ public class NullableClass extends HashMap<String, Object> {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -226,14 +226,14 @@ public class NullableClass extends HashMap<String, Object> {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -259,14 +259,14 @@ public class NullableClass extends HashMap<String, Object> {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -292,14 +292,14 @@ public class NullableClass extends HashMap<String, Object> {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -337,14 +337,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -382,14 +382,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -417,7 +417,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,14 +460,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -505,14 +505,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -540,7 +540,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index 022f36112c6..356a23dc3dc 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -54,7 +54,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -62,7 +62,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 4c27ae76866..285bd6ece9b 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -73,7 +73,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -81,7 +81,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -100,7 +100,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -108,7 +108,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -127,7 +127,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -135,7 +135,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -162,7 +162,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -170,7 +170,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
index 0a4dc4b7941..91e1883b7a8 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,7 +166,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -174,7 +174,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -191,7 +191,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -199,7 +199,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -216,7 +216,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -224,7 +224,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -241,7 +241,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -249,7 +249,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index 2671985307b..ae521960d7b 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -64,7 +64,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -72,7 +72,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -89,7 +89,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -97,7 +97,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -114,7 +114,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -122,7 +122,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 760d412e563..30b2b2811d7 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -54,7 +54,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -62,7 +62,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index d7c8c8c7809..1c239fadba1 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -107,7 +107,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -115,7 +115,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -138,14 +138,14 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
index 178bcdf5a62..93ee44799cc 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,7 +123,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -131,7 +131,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -148,7 +148,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -156,7 +156,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -173,7 +173,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -181,7 +181,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -206,7 +206,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -215,7 +215,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -240,7 +240,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -248,7 +248,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -265,7 +265,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -273,7 +273,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d7fe46e812c..9bbc3996a5a 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -51,7 +51,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -90,7 +90,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1ebc72ac3a1..df5ec4acfc8 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -54,7 +54,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -62,7 +62,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
index 6a65527b1e2..2542f7dbdbd 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 041204a7bc2..7d4fd937f0d 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -57,7 +57,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -65,7 +65,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
index c28536928e2..80b9d672fa5 100644
--- a/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -96,7 +96,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -113,7 +113,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -121,7 +121,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -138,7 +138,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -146,7 +146,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -163,7 +163,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -171,7 +171,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -188,7 +188,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -196,7 +196,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -213,7 +213,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -221,7 +221,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -238,7 +238,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -246,7 +246,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -263,7 +263,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -271,7 +271,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 8e9d4da7934..2e119eed415 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -99,7 +99,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -107,7 +107,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 6cf1b1af63d..3796f7a337a 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -82,7 +82,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -90,7 +90,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Animal.java
index 3cb0c0ec4c7..6b97a3d2709 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -94,7 +94,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -102,7 +102,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 48a9566027c..6872779a024 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index b3618cd6bb3..4cb5c0a30b2 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayTest.java
index c898e1d8038..f4650bf62d9 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -106,7 +106,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -114,7 +114,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -140,7 +140,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -148,7 +148,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Capitalization.java
index 61e2a6cbb8c..cb3de8a47df 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -101,7 +101,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -109,7 +109,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,7 +127,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -135,7 +135,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -153,7 +153,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -161,7 +161,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -179,7 +179,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -187,7 +187,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -205,7 +205,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -213,7 +213,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Cat.java
index db2cf2a7e7e..639661476fe 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Category.java
index 033f50b7676..046f100ee89 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 2cda978c379..4e947e67a48 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d2b984a2cd..df3587f2cb1 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Client.java
index 1f741134586..3aa9e08d862 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 6a376d1d3c2..2ac6efe31ae 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Dog.java
index 6bc6de6e196..982d98f19a4 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumArrays.java
index eceadd7fdb0..849334be0f8 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -162,7 +162,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -170,7 +170,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumTest.java
index 003b2bb4a1d..a6d9a2632c9 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -289,7 +289,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -297,7 +297,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -315,7 +315,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -323,7 +323,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -347,7 +347,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -375,7 +375,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -383,7 +383,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -401,7 +401,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -409,7 +409,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -427,7 +427,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -435,7 +435,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 06987804723..5baa7501532 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -93,7 +93,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -101,7 +101,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/File.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/File.java
index fb2a9bb0ba0..85a65ea43eb 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/File.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/File.java
@@ -50,7 +50,7 @@ public class File {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public class File {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index ddc0c63e75c..16e482e3f2f 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable File file) {
     this.file = file;
@@ -93,7 +93,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<File> getFiles() {
@@ -101,7 +101,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<File> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Foo.java
index 1343e29a90e..58c0c144e2c 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b8e4d184c0f..9870f6d3a4d 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FormatTest.java
index 3d52274486b..fcb09a26743 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -161,7 +161,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -169,7 +169,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -187,7 +187,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -195,7 +195,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -215,7 +215,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -223,7 +223,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -243,7 +243,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -251,7 +251,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -271,7 +271,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -279,7 +279,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -297,7 +297,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -305,7 +305,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -323,7 +323,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -331,7 +331,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -349,7 +349,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -357,7 +357,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -375,7 +375,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -383,7 +383,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -401,7 +401,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -409,7 +409,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -427,7 +427,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -435,7 +435,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -453,7 +453,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -461,7 +461,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -479,7 +479,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -487,7 +487,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -505,7 +505,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -513,7 +513,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -531,7 +531,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -539,7 +539,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 7c4a334d50e..9c10d1e40ad 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -60,7 +60,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 91b101d36e3..4ea7a5b57f6 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,7 +59,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MapTest.java
index 1e33c5d356b..2406bc60925 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -144,7 +144,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -152,7 +152,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,7 +178,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -186,7 +186,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -212,7 +212,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -220,7 +220,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 35fc496e043..97e81a9172c 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -91,7 +91,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -99,7 +99,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,7 +125,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -133,7 +133,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Model200Response.java
index f6ba2eaecc0..110ea86dcb3 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -82,7 +82,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -90,7 +90,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 6e3b10f29d2..aa74261abf5 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -87,7 +87,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -95,7 +95,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,7 +113,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -121,7 +121,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelList.java
index a4f2f221946..0a30e58fe24 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelReturn.java
index c4f64dc9a66..6217c43b9dc 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Name.java
index c960d818abf..379491b6472 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Name.java
@@ -75,7 +75,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -83,7 +83,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -136,7 +136,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NullableClass.java
index dcc4d006a09..10309cafeb9 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -117,7 +117,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -151,7 +151,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -185,7 +185,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> isBooleanProp_JsonNullable() {
@@ -219,7 +219,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -253,7 +253,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -287,7 +287,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -333,7 +333,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -379,7 +379,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -415,7 +415,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -423,7 +423,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,7 +459,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -541,7 +541,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -549,7 +549,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NumberOnly.java
index 93f1be9d1d9..ee6767819fd 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 5d41c6ad971..9e835a4d220 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -98,7 +98,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -106,7 +106,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -126,7 +126,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -134,7 +134,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -162,7 +162,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -170,7 +170,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Order.java
index 175fdf7e48e..2466f5e8e71 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -139,7 +139,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -147,7 +147,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,7 +165,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -173,7 +173,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -191,7 +191,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -199,7 +199,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -217,7 +217,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -225,7 +225,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -243,7 +243,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -251,7 +251,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7d44a03ed8b..314b073d421 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -87,7 +87,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -95,7 +95,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,7 +113,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -121,7 +121,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index bb003e14871..c9d09b761aa 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index be54ca76ea2..f2e8a3ea944 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Pet.java
index 7443c1c1f4a..32893ec2202 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -172,7 +172,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -180,7 +180,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -206,7 +206,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -215,7 +215,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -241,7 +241,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -249,7 +249,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -267,7 +267,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -275,7 +275,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index abc888cc0f8..258267bf3f3 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -57,7 +57,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/SpecialModelName.java
index f77d213e8b7..03eaec13fbf 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Tag.java
index 3ebd839fc00..dc6d909d470 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 598d5be46bb..839c0fec3f8 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/User.java
index 41a720b9b06..a63c9387e01 100644
--- a/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/feign-hc5/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -111,7 +111,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -119,7 +119,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -137,7 +137,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -145,7 +145,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -163,7 +163,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -171,7 +171,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -189,7 +189,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -197,7 +197,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -215,7 +215,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -223,7 +223,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -241,7 +241,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -249,7 +249,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -267,7 +267,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -275,7 +275,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 63d0643a02c..5a00601d9b9 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -60,7 +60,7 @@ public class AdditionalPropertiesAnyType {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public class AdditionalPropertiesAnyType {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 5302b991144..037be1ed0c4 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -61,7 +61,7 @@ public class AdditionalPropertiesArray {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -69,7 +69,7 @@ public class AdditionalPropertiesArray {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 774896820ea..64ab41427ff 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -60,7 +60,7 @@ public class AdditionalPropertiesBoolean {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public class AdditionalPropertiesBoolean {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 5518a4dee76..a6e09091e13 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -118,7 +118,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -126,7 +126,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -153,7 +153,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -161,7 +161,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -188,7 +188,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -196,7 +196,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -223,7 +223,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -231,7 +231,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -258,7 +258,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -266,7 +266,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -293,7 +293,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -301,7 +301,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -328,7 +328,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -336,7 +336,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -363,7 +363,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -371,7 +371,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -390,7 +390,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -398,7 +398,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -417,7 +417,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -425,7 +425,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -444,7 +444,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -452,7 +452,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index 852546a6732..0ea7697f67d 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -60,7 +60,7 @@ public class AdditionalPropertiesInteger {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public class AdditionalPropertiesInteger {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 84619c9b698..dda788b1660 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -61,7 +61,7 @@ public class AdditionalPropertiesNumber {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -69,7 +69,7 @@ public class AdditionalPropertiesNumber {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 045289dd5ee..60d48540188 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -61,7 +61,7 @@ public class AdditionalPropertiesObject {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -69,7 +69,7 @@ public class AdditionalPropertiesObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 3672021e21e..a050dd36392 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -60,7 +60,7 @@ public class AdditionalPropertiesString {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -68,7 +68,7 @@ public class AdditionalPropertiesString {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
index 2c7101170ab..900f493a9eb 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
@@ -75,7 +75,7 @@ public class Animal {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -83,7 +83,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -102,7 +102,7 @@ public class Animal {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -110,7 +110,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 52e60fb16cd..6651ba92765 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public class ArrayOfArrayOfNumberOnly {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -76,7 +76,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 4d4563a2a99..64ce38ecdb3 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -68,7 +68,7 @@ public class ArrayOfNumberOnly {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -76,7 +76,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
index 67691d1d0c7..0d4cf72edb9 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -78,7 +78,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -86,7 +86,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -113,7 +113,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -121,7 +121,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -148,7 +148,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -156,7 +156,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
index 2ae5a69ccee..9f9ca3e1a3c 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
@@ -106,7 +106,7 @@ public class BigCat extends Cat {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -114,7 +114,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
index 22e0ed1083d..da36d34ef20 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -81,7 +81,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -89,7 +89,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -108,7 +108,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -116,7 +116,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -135,7 +135,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -143,7 +143,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -162,7 +162,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -170,7 +170,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -189,7 +189,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -197,7 +197,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -216,7 +216,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -224,7 +224,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
index 5be75660b4f..951a7d14359 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
@@ -70,7 +70,7 @@ public class Cat extends Animal {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -78,7 +78,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
index 91554ea6168..4805e533caf 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Category.java
@@ -61,7 +61,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Category {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
index 6d020666560..673c4ab5e97 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -57,7 +57,7 @@ public class ClassModel {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -65,7 +65,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
index d038bc5e20d..4c350579907 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Client.java
@@ -56,7 +56,7 @@ public class Client {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -64,7 +64,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
index 888e70f85b9..7ed62c30012 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
@@ -67,7 +67,7 @@ public class Dog extends Animal {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -75,7 +75,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
index c412bf74092..66a113f994a 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -134,7 +134,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -142,7 +142,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -169,7 +169,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -177,7 +177,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
index 5ecc21666cc..8ebd04cac48 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -222,7 +222,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -230,7 +230,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -249,7 +249,7 @@ public class EnumTest {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -257,7 +257,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -276,7 +276,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -284,7 +284,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -303,7 +303,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -311,7 +311,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -330,7 +330,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -338,7 +338,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
index 3e72c52d574..6b9b33f92a5 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/File.java
@@ -57,7 +57,7 @@ public class File {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -65,7 +65,7 @@ public class File {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index b8b11af3e2c..30080b82db2 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -65,7 +65,7 @@ public class FileSchemaTestClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getFile() {
@@ -73,7 +73,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable File file) {
     this.file = file;
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<File> getFiles() {
@@ -108,7 +108,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<File> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
index 66ec9f08da5..1086b32b992 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -129,7 +129,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -137,7 +137,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -158,7 +158,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -166,7 +166,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -214,7 +214,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -222,7 +222,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -243,7 +243,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -251,7 +251,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -272,7 +272,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -280,7 +280,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -299,7 +299,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -307,7 +307,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -326,7 +326,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -334,7 +334,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -353,7 +353,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -361,7 +361,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -380,7 +380,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -388,7 +388,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -407,7 +407,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -415,7 +415,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -434,7 +434,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", value = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -442,7 +442,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -461,7 +461,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -469,7 +469,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -488,7 +488,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -496,7 +496,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 5fcc92d5a5a..fac750d11d4 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -66,7 +66,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
index 0c4977a745a..141fcb2fb60 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
@@ -116,7 +116,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -124,7 +124,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -151,7 +151,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -159,7 +159,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -186,7 +186,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -194,7 +194,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -221,7 +221,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -229,7 +229,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b7ab11702e8..30f2d7e45ae 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -71,7 +71,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -79,7 +79,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -106,7 +106,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -133,7 +133,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -141,7 +141,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
index d2ed8760125..b4b09e157f1 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -63,7 +63,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -71,7 +71,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -90,7 +90,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -98,7 +98,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 508950b3b3f..a78d19918d2 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -67,7 +67,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -75,7 +75,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -94,7 +94,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -102,7 +102,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -121,7 +121,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -129,7 +129,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
index fbd91b164fc..89f06608997 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
@@ -57,7 +57,7 @@ public class ModelList {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -65,7 +65,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
index 00984d19a40..05db1f34e8a 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -58,7 +58,7 @@ public class ModelReturn {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -66,7 +66,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
index a9dd9d034b9..4f79cd75752 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Name.java
@@ -82,7 +82,7 @@ public class Name {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -90,7 +90,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -103,7 +103,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -125,7 +125,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -133,7 +133,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -146,7 +146,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
index f136994b8da..575b14fd7b0 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -57,7 +57,7 @@ public class NumberOnly {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -65,7 +65,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
index d40f71bdde2..449c0f0aa1f 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Order.java
@@ -119,7 +119,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -154,7 +154,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -173,7 +173,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -181,7 +181,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -200,7 +200,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -208,7 +208,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -227,7 +227,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -235,7 +235,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -254,7 +254,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -262,7 +262,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
index 1681a52b79f..7bb88743d0f 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -67,7 +67,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -75,7 +75,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -94,7 +94,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -102,7 +102,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -121,7 +121,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -129,7 +129,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
index a4f161034d9..cbf7e16ee49 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
@@ -126,7 +126,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -134,7 +134,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -153,7 +153,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -161,7 +161,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -180,7 +180,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -188,7 +188,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -215,7 +215,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -224,7 +224,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -251,7 +251,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -259,7 +259,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -278,7 +278,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -286,7 +286,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 2ad33bb9189..9bb90aed82c 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -63,7 +63,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -85,7 +85,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -93,7 +93,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 7cf5f00bc71..d6502fc8506 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -57,7 +57,7 @@ public class SpecialModelName {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -65,7 +65,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
index adfb86f8f94..786e6115778 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
@@ -61,7 +61,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index ab43f995f92..af746dbf6de 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -80,7 +80,7 @@ public class TypeHolderDefault {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -88,7 +88,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -107,7 +107,7 @@ public class TypeHolderDefault {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -115,7 +115,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -134,7 +134,7 @@ public class TypeHolderDefault {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -142,7 +142,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -161,7 +161,7 @@ public class TypeHolderDefault {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -169,7 +169,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -196,7 +196,7 @@ public class TypeHolderDefault {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -204,7 +204,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 9455dcedfb6..591ca3c7507 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -85,7 +85,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "what", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -93,7 +93,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -112,7 +112,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "1.234", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -120,7 +120,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -139,7 +139,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "1.234", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -147,7 +147,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -166,7 +166,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "-2", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -174,7 +174,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -193,7 +193,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "true", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -201,7 +201,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -228,7 +228,7 @@ public class TypeHolderExample {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "[0, 1, 2, 3]", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -236,7 +236,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
index cabbaed555a..ffc4adbf47c 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/User.java
@@ -91,7 +91,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -99,7 +99,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -118,7 +118,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -126,7 +126,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -145,7 +145,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -153,7 +153,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -172,7 +172,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -180,7 +180,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -199,7 +199,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -207,7 +207,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -226,7 +226,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -234,7 +234,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -253,7 +253,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -261,7 +261,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -280,7 +280,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -288,7 +288,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
index cf8bd91783a..6681734e257 100644
--- a/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -200,7 +200,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -208,7 +208,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -227,7 +227,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -235,7 +235,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -254,7 +254,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -262,7 +262,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -281,7 +281,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isAttributeBoolean() {
@@ -289,7 +289,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -316,7 +316,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -324,7 +324,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -343,7 +343,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -351,7 +351,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -370,7 +370,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -378,7 +378,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -397,7 +397,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -405,7 +405,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -424,7 +424,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNameBoolean() {
@@ -432,7 +432,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -459,7 +459,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -467,7 +467,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -494,7 +494,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -502,7 +502,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -521,7 +521,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -529,7 +529,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -548,7 +548,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -556,7 +556,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -575,7 +575,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -583,7 +583,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -602,7 +602,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixBoolean() {
@@ -610,7 +610,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -637,7 +637,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -645,7 +645,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -672,7 +672,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -680,7 +680,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -699,7 +699,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -707,7 +707,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -726,7 +726,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -734,7 +734,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -753,7 +753,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -761,7 +761,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -780,7 +780,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNamespaceBoolean() {
@@ -788,7 +788,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -815,7 +815,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -823,7 +823,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -850,7 +850,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -858,7 +858,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -877,7 +877,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "string", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -885,7 +885,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -904,7 +904,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "1.234", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -912,7 +912,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -931,7 +931,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "-2", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -939,7 +939,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -958,7 +958,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(example = "true", value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixNsBoolean() {
@@ -966,7 +966,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -993,7 +993,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -1001,7 +1001,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1028,7 +1028,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1036,7 +1036,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 8e9d4da7934..2e119eed415 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -99,7 +99,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -107,7 +107,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 6cf1b1af63d..3796f7a337a 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -82,7 +82,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -90,7 +90,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
index 3cb0c0ec4c7..6b97a3d2709 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -94,7 +94,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -102,7 +102,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 48a9566027c..6872779a024 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index b3618cd6bb3..4cb5c0a30b2 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
index c898e1d8038..f4650bf62d9 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -106,7 +106,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -114,7 +114,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -140,7 +140,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -148,7 +148,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
index 61e2a6cbb8c..cb3de8a47df 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -101,7 +101,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -109,7 +109,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,7 +127,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -135,7 +135,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -153,7 +153,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -161,7 +161,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -179,7 +179,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -187,7 +187,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -205,7 +205,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -213,7 +213,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
index db2cf2a7e7e..639661476fe 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
index 033f50b7676..046f100ee89 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 2cda978c379..4e947e67a48 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d2b984a2cd..df3587f2cb1 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
index 1f741134586..3aa9e08d862 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 6a376d1d3c2..2ac6efe31ae 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
index 6bc6de6e196..982d98f19a4 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
index eceadd7fdb0..849334be0f8 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -162,7 +162,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -170,7 +170,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
index 003b2bb4a1d..a6d9a2632c9 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -237,7 +237,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -245,7 +245,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -289,7 +289,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -297,7 +297,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -315,7 +315,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -323,7 +323,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -347,7 +347,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -375,7 +375,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -383,7 +383,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -401,7 +401,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -409,7 +409,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -427,7 +427,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -435,7 +435,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 06987804723..5baa7501532 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -93,7 +93,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -101,7 +101,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
index fb2a9bb0ba0..85a65ea43eb 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/File.java
@@ -50,7 +50,7 @@ public class File {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -58,7 +58,7 @@ public class File {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index ddc0c63e75c..16e482e3f2f 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable File file) {
     this.file = file;
@@ -93,7 +93,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<File> getFiles() {
@@ -101,7 +101,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<File> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
index 1343e29a90e..58c0c144e2c 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b8e4d184c0f..9870f6d3a4d 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
index 3d52274486b..fcb09a26743 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -161,7 +161,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -169,7 +169,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -187,7 +187,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -195,7 +195,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -215,7 +215,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -223,7 +223,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -243,7 +243,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -251,7 +251,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -271,7 +271,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -279,7 +279,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -297,7 +297,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -305,7 +305,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -323,7 +323,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -331,7 +331,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -349,7 +349,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -357,7 +357,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -375,7 +375,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -383,7 +383,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -401,7 +401,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -409,7 +409,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -427,7 +427,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -435,7 +435,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -453,7 +453,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -461,7 +461,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -479,7 +479,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -487,7 +487,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -505,7 +505,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -513,7 +513,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -531,7 +531,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -539,7 +539,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 7c4a334d50e..9c10d1e40ad 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -60,7 +60,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -75,7 +75,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 91b101d36e3..4ea7a5b57f6 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -59,7 +59,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
index 1e33c5d356b..2406bc60925 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -144,7 +144,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -152,7 +152,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,7 +178,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -186,7 +186,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -212,7 +212,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -220,7 +220,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 35fc496e043..97e81a9172c 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -91,7 +91,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -99,7 +99,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,7 +125,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -133,7 +133,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
index f6ba2eaecc0..110ea86dcb3 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -82,7 +82,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -90,7 +90,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 6e3b10f29d2..aa74261abf5 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -87,7 +87,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -95,7 +95,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,7 +113,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -121,7 +121,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
index a4f2f221946..0a30e58fe24 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
index c4f64dc9a66..6217c43b9dc 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
index c960d818abf..379491b6472 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Name.java
@@ -75,7 +75,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -83,7 +83,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -95,7 +95,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -136,7 +136,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
index dcc4d006a09..10309cafeb9 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -117,7 +117,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -151,7 +151,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -185,7 +185,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> isBooleanProp_JsonNullable() {
@@ -219,7 +219,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -253,7 +253,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -287,7 +287,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -333,7 +333,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -379,7 +379,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -415,7 +415,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -423,7 +423,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -459,7 +459,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -541,7 +541,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -549,7 +549,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
index 93f1be9d1d9..ee6767819fd 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 5d41c6ad971..9e835a4d220 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -98,7 +98,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -106,7 +106,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -126,7 +126,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -134,7 +134,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -162,7 +162,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -170,7 +170,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
index 175fdf7e48e..2466f5e8e71 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -139,7 +139,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -147,7 +147,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,7 +165,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -173,7 +173,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -191,7 +191,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -199,7 +199,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -217,7 +217,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -225,7 +225,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -243,7 +243,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -251,7 +251,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
index 7d44a03ed8b..314b073d421 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -87,7 +87,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -95,7 +95,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,7 +113,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -121,7 +121,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index bb003e14871..c9d09b761aa 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index be54ca76ea2..f2e8a3ea944 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -103,7 +103,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -111,7 +111,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
index 7443c1c1f4a..32893ec2202 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -172,7 +172,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -180,7 +180,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -206,7 +206,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -215,7 +215,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -241,7 +241,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -249,7 +249,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -267,7 +267,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -275,7 +275,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index abc888cc0f8..258267bf3f3 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -57,7 +57,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -86,7 +86,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
index f77d213e8b7..03eaec13fbf 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
index 3ebd839fc00..dc6d909d470 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -81,7 +81,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -89,7 +89,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 598d5be46bb..839c0fec3f8 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
index 41a720b9b06..a63c9387e01 100644
--- a/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -111,7 +111,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -119,7 +119,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -137,7 +137,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -145,7 +145,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -163,7 +163,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -171,7 +171,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -189,7 +189,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -197,7 +197,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -215,7 +215,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -223,7 +223,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -241,7 +241,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -249,7 +249,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -267,7 +267,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -275,7 +275,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 8afd2f5020e..610378be1a1 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index cec74b5439c..0b2756a13a2 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -54,7 +54,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 864af85f525..20dc974d3eb 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 5fc006ae735..c8a10cd27d4 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -112,7 +112,7 @@ public class AdditionalPropertiesClass {
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -120,7 +120,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -145,7 +145,7 @@ public class AdditionalPropertiesClass {
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -153,7 +153,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -178,7 +178,7 @@ public class AdditionalPropertiesClass {
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -186,7 +186,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -211,7 +211,7 @@ public class AdditionalPropertiesClass {
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -219,7 +219,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -244,7 +244,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -252,7 +252,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -277,7 +277,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -285,7 +285,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -310,7 +310,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -318,7 +318,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -343,7 +343,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -351,7 +351,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -368,7 +368,7 @@ public class AdditionalPropertiesClass {
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -376,7 +376,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -393,7 +393,7 @@ public class AdditionalPropertiesClass {
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -401,7 +401,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -418,7 +418,7 @@ public class AdditionalPropertiesClass {
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -426,7 +426,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index c0628c3f799..139c4eb9323 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 87d3efd48e4..e3bc73e2947 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -54,7 +54,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index f5bb8adb470..0e559595190 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index b2ac0ee76ee..9ecc332272b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
index 4dfe4513e00..093d8446f10 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java
@@ -69,7 +69,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -77,7 +77,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -94,7 +94,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -102,7 +102,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6ce9b83c67e..c2d684e2fcf 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f36135202ce..28fbf8c2d5b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2453f58cc35..e0175f2d03d 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
index 07c91941dbf..d9c0cb3a9a0 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/BigCat.java
@@ -100,7 +100,7 @@ public class BigCat extends Cat {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -108,7 +108,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
index 5682f213b65..e4864216208 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
index 6e1800185d6..f4ea08ab72b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Cat.java
@@ -64,7 +64,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -72,7 +72,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
index 78cc077529b..249f14c58a6 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
index 74dd4385a90..bc883861da5 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
index 99fe381a876..76b0c5cac91 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
index 9c932cb01bd..63cc53e6602 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
index e6cca680c1f..95af14f9eb1 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
index da91df336aa..6c7c1718ee7 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -216,7 +216,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -224,7 +224,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -241,7 +241,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -249,7 +249,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -266,7 +266,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -274,7 +274,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -291,7 +291,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -299,7 +299,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -316,7 +316,7 @@ public class EnumTest {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -324,7 +324,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a05efa3c913..28eae4a9c51 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
index 079a4a757ce..4bbf3908ac9 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -123,7 +123,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -131,7 +131,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -150,7 +150,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -158,7 +158,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -175,7 +175,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -183,7 +183,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -202,7 +202,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -210,7 +210,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -229,7 +229,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -237,7 +237,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -256,7 +256,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -264,7 +264,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -281,7 +281,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -289,7 +289,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -306,7 +306,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -314,7 +314,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -331,7 +331,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -339,7 +339,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -356,7 +356,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -364,7 +364,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -381,7 +381,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -389,7 +389,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -406,7 +406,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -414,7 +414,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -431,7 +431,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -439,7 +439,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -456,7 +456,7 @@ public class FormatTest {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -464,7 +464,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index ef912674bde..dd34438d5ed 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
index ec9e81743d7..99c72041af4 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b480c7d542d..d0219f2e217 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
index 2a69b55cfd6..7a268eb4a14 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f080773624a..1255ae56e3d 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
index 21f812364f0..45f97655028 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
index c24868360f6..dfef26ef7fb 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
index b7ca4af717d..6901c048a0a 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
index dce25ead211..4c67288873e 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Name.java
@@ -58,8 +58,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
index a91f0c49358..c0748fb6a1c 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
index 64b26edbd41..54308806a1d 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3ba67944ba1..d4122b6599f 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
index 2a0fdfd8c10..91c27389915 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d1147f1fda3..eee83de7ead 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 2d571740d95..4ab74a64c27 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
index c46a759548f..666772aed4b 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 0548be6b0e3..10f17b5ff91 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -74,7 +74,7 @@ public class TypeHolderDefault {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -82,7 +82,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -99,7 +99,7 @@ public class TypeHolderDefault {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -107,7 +107,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -124,7 +124,7 @@ public class TypeHolderDefault {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -132,7 +132,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -149,7 +149,7 @@ public class TypeHolderDefault {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -157,7 +157,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -182,7 +182,7 @@ public class TypeHolderDefault {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -190,7 +190,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 39766e339f9..d482405dc44 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -79,7 +79,7 @@ public class TypeHolderExample {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -104,7 +104,7 @@ public class TypeHolderExample {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -112,7 +112,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -129,7 +129,7 @@ public class TypeHolderExample {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -137,7 +137,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -154,7 +154,7 @@ public class TypeHolderExample {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -162,7 +162,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -179,7 +179,7 @@ public class TypeHolderExample {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -187,7 +187,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -212,7 +212,7 @@ public class TypeHolderExample {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -220,7 +220,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
index 006f4222a31..f342e9bcd3a 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
index f10791f784a..92df8c1d5b3 100644
--- a/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -194,7 +194,7 @@ public class XmlItem {
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -202,7 +202,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -219,7 +219,7 @@ public class XmlItem {
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -227,7 +227,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -244,7 +244,7 @@ public class XmlItem {
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -252,7 +252,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -269,7 +269,7 @@ public class XmlItem {
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -277,7 +277,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -302,7 +302,7 @@ public class XmlItem {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -310,7 +310,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -327,7 +327,7 @@ public class XmlItem {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -335,7 +335,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -352,7 +352,7 @@ public class XmlItem {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -360,7 +360,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -377,7 +377,7 @@ public class XmlItem {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -385,7 +385,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -402,7 +402,7 @@ public class XmlItem {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -410,7 +410,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -435,7 +435,7 @@ public class XmlItem {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -443,7 +443,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -468,7 +468,7 @@ public class XmlItem {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -476,7 +476,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -493,7 +493,7 @@ public class XmlItem {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -501,7 +501,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -518,7 +518,7 @@ public class XmlItem {
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -526,7 +526,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -543,7 +543,7 @@ public class XmlItem {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -551,7 +551,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -568,7 +568,7 @@ public class XmlItem {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -576,7 +576,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -601,7 +601,7 @@ public class XmlItem {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -609,7 +609,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -634,7 +634,7 @@ public class XmlItem {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -642,7 +642,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -659,7 +659,7 @@ public class XmlItem {
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -667,7 +667,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -684,7 +684,7 @@ public class XmlItem {
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -692,7 +692,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -709,7 +709,7 @@ public class XmlItem {
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -717,7 +717,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -734,7 +734,7 @@ public class XmlItem {
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -742,7 +742,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -767,7 +767,7 @@ public class XmlItem {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -775,7 +775,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -800,7 +800,7 @@ public class XmlItem {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -808,7 +808,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -825,7 +825,7 @@ public class XmlItem {
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -833,7 +833,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -850,7 +850,7 @@ public class XmlItem {
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -858,7 +858,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -875,7 +875,7 @@ public class XmlItem {
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -883,7 +883,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -900,7 +900,7 @@ public class XmlItem {
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -908,7 +908,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -933,7 +933,7 @@ public class XmlItem {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -941,7 +941,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -966,7 +966,7 @@ public class XmlItem {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -974,7 +974,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 3669ec2b749..b13c7a2af78 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesAnyType {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesAnyType {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 58d207b799d..582b84fcebb 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesArray {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesArray {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index ceeb4ff66c7..509fab02d8a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesBoolean {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesBoolean {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a4271593547..7234016ff96 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -114,7 +114,7 @@ public class AdditionalPropertiesClass {
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -122,7 +122,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -147,7 +147,7 @@ public class AdditionalPropertiesClass {
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -155,7 +155,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -180,7 +180,7 @@ public class AdditionalPropertiesClass {
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -188,7 +188,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -213,7 +213,7 @@ public class AdditionalPropertiesClass {
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -221,7 +221,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -246,7 +246,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -254,7 +254,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -279,7 +279,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -287,7 +287,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -312,7 +312,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -320,7 +320,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -345,7 +345,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -353,7 +353,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -370,7 +370,7 @@ public class AdditionalPropertiesClass {
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -378,7 +378,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -395,7 +395,7 @@ public class AdditionalPropertiesClass {
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -403,7 +403,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -420,7 +420,7 @@ public class AdditionalPropertiesClass {
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -428,7 +428,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index f84eb037573..89df7723d44 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesInteger {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesInteger {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 1efe49749df..96be54b277e 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesNumber {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesNumber {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index fd7a2bdcc6b..e52a4456ca2 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 40bb58f247b..ecc06add09b 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesString {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesString {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
index 762ce1ea840..e1d4d805c82 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Animal.java
@@ -71,7 +71,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -79,7 +79,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index b98cafbbbce..4cc84bbc2ab 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -71,7 +71,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index cfed0670014..134f60a31ef 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -71,7 +71,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
index dac39d2b9a7..f8d129483f8 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -73,7 +73,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -81,7 +81,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -106,7 +106,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -114,7 +114,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -139,7 +139,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -147,7 +147,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
index 657ed427dba..a40f9d59476 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/BigCat.java
@@ -101,7 +101,7 @@ public class BigCat extends Cat {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -109,7 +109,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
index 660e37085ac..b40a09ba0ea 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -102,7 +102,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -110,7 +110,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,7 +127,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -135,7 +135,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -152,7 +152,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -160,7 +160,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -177,7 +177,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -185,7 +185,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -202,7 +202,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -210,7 +210,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
index 37b88ce8392..32d94ea0e0c 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Cat.java
@@ -65,7 +65,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -73,7 +73,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
index 6f93cc06f76..a1a8b50ce17 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d79b6426ba..ed88bd95c91 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
index 7974fd221a5..4f301ba7fa5 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
index c65f99508fb..6f5340ae638 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Dog.java
@@ -62,7 +62,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -70,7 +70,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
index 4bf6b5b8adc..a6ddc12711a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -129,7 +129,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -137,7 +137,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -162,7 +162,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -170,7 +170,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
index 7fd6743e859..7582662f1b6 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -218,7 +218,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -226,7 +226,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -243,7 +243,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -251,7 +251,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -268,7 +268,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -276,7 +276,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -293,7 +293,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -301,7 +301,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -318,7 +318,7 @@ public class EnumTest {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -326,7 +326,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index f918f74ed26..7fb3ec15d83 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -60,7 +60,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -68,7 +68,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -93,7 +93,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -101,7 +101,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
index ef745adae3d..84b602e1a0e 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -125,7 +125,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -133,7 +133,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -152,7 +152,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -160,7 +160,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -177,7 +177,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -185,7 +185,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -204,7 +204,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -212,7 +212,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -231,7 +231,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -239,7 +239,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -258,7 +258,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -266,7 +266,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -283,7 +283,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -291,7 +291,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -308,7 +308,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -316,7 +316,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -333,7 +333,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -341,7 +341,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -358,7 +358,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -366,7 +366,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -383,7 +383,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getDateTime() {
@@ -391,7 +391,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable LocalDateTime dateTime) {
     this.dateTime = dateTime;
@@ -408,7 +408,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -416,7 +416,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -433,7 +433,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -441,7 +441,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -458,7 +458,7 @@ public class FormatTest {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -466,7 +466,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 17cca6a2320..9f0c0cc4fc5 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -63,7 +63,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
index a91343d4e39..c038bf4bed7 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MapTest.java
@@ -112,7 +112,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -120,7 +120,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -145,7 +145,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -153,7 +153,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,7 +178,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -186,7 +186,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -211,7 +211,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -219,7 +219,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 2bb465df587..15d839effcc 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -75,7 +75,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -92,7 +92,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getDateTime() {
@@ -100,7 +100,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable LocalDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,7 +125,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -133,7 +133,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
index 3f582ce9966..2db77a7e154 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -83,7 +83,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -91,7 +91,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 3afd743b68c..8785ead7f9a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,7 +88,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -96,7 +96,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,7 +113,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -121,7 +121,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
index 573a0f09ae4..ee94ca72349 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
index c443b42e2fa..c8ad5a307f3 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
index 488f0dfe2ab..441e6b8844b 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
index d59aaa66fd0..ab6dae15f68 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -97,7 +97,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -117,7 +117,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -125,7 +125,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -137,7 +137,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
index 8df7be2d2cb..47079120d64 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -53,7 +53,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -61,7 +61,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
index 9f5bfe08f73..058f7a1654c 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -148,7 +148,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,7 +165,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -173,7 +173,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,7 +190,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public LocalDateTime getShipDate() {
@@ -198,7 +198,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable LocalDateTime shipDate) {
     this.shipDate = shipDate;
@@ -215,7 +215,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -223,7 +223,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -240,7 +240,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -248,7 +248,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
index bd9277f2cdb..871f76488c9 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -63,7 +63,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -71,7 +71,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -88,7 +88,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -96,7 +96,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,7 +113,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -121,7 +121,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
index 007f5360513..2748ec3e5bc 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -171,7 +171,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -179,7 +179,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -204,7 +204,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -213,7 +213,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -238,7 +238,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -246,7 +246,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -263,7 +263,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -271,7 +271,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index b0eebf16a2b..9bef3dbf783 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -60,7 +60,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -80,7 +80,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -88,7 +88,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 94252cf596d..284775c73d0 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
index 19ff6fb3898..b134681ce37 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 5d1b1f95715..8c4625176d2 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -75,7 +75,7 @@ public class TypeHolderDefault {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -83,7 +83,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -100,7 +100,7 @@ public class TypeHolderDefault {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -108,7 +108,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -125,7 +125,7 @@ public class TypeHolderDefault {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -133,7 +133,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -150,7 +150,7 @@ public class TypeHolderDefault {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -158,7 +158,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -183,7 +183,7 @@ public class TypeHolderDefault {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -191,7 +191,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index a6e5a79a951..28e6de7315a 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -80,7 +80,7 @@ public class TypeHolderExample {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -88,7 +88,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -105,7 +105,7 @@ public class TypeHolderExample {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -113,7 +113,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -130,7 +130,7 @@ public class TypeHolderExample {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -138,7 +138,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -155,7 +155,7 @@ public class TypeHolderExample {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -163,7 +163,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -180,7 +180,7 @@ public class TypeHolderExample {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -188,7 +188,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -213,7 +213,7 @@ public class TypeHolderExample {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -221,7 +221,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
index 19ee89b4614..17888e808d6 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -112,7 +112,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -120,7 +120,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -137,7 +137,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -145,7 +145,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -162,7 +162,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -170,7 +170,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -187,7 +187,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -195,7 +195,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -212,7 +212,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -220,7 +220,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -237,7 +237,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -245,7 +245,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -262,7 +262,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -270,7 +270,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
index 6fb1e58896d..60ebd664c90 100644
--- a/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -195,7 +195,7 @@ public class XmlItem {
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -203,7 +203,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -220,7 +220,7 @@ public class XmlItem {
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -228,7 +228,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -245,7 +245,7 @@ public class XmlItem {
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -253,7 +253,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -270,7 +270,7 @@ public class XmlItem {
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -278,7 +278,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -303,7 +303,7 @@ public class XmlItem {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -311,7 +311,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -328,7 +328,7 @@ public class XmlItem {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -336,7 +336,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -353,7 +353,7 @@ public class XmlItem {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -361,7 +361,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -378,7 +378,7 @@ public class XmlItem {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -386,7 +386,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -403,7 +403,7 @@ public class XmlItem {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -411,7 +411,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -436,7 +436,7 @@ public class XmlItem {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -444,7 +444,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -469,7 +469,7 @@ public class XmlItem {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -477,7 +477,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -494,7 +494,7 @@ public class XmlItem {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -502,7 +502,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -519,7 +519,7 @@ public class XmlItem {
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -527,7 +527,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -544,7 +544,7 @@ public class XmlItem {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -552,7 +552,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -569,7 +569,7 @@ public class XmlItem {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -577,7 +577,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -602,7 +602,7 @@ public class XmlItem {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -610,7 +610,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -635,7 +635,7 @@ public class XmlItem {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -643,7 +643,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -660,7 +660,7 @@ public class XmlItem {
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -668,7 +668,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -685,7 +685,7 @@ public class XmlItem {
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -693,7 +693,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -710,7 +710,7 @@ public class XmlItem {
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -718,7 +718,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -735,7 +735,7 @@ public class XmlItem {
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -743,7 +743,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -768,7 +768,7 @@ public class XmlItem {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -776,7 +776,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -801,7 +801,7 @@ public class XmlItem {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -809,7 +809,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -826,7 +826,7 @@ public class XmlItem {
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -834,7 +834,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -851,7 +851,7 @@ public class XmlItem {
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -859,7 +859,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -876,7 +876,7 @@ public class XmlItem {
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -884,7 +884,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -901,7 +901,7 @@ public class XmlItem {
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -909,7 +909,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -934,7 +934,7 @@ public class XmlItem {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -942,7 +942,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -967,7 +967,7 @@ public class XmlItem {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -975,7 +975,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 3669ec2b749..b13c7a2af78 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesAnyType {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesAnyType {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 58d207b799d..582b84fcebb 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesArray {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesArray {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index ceeb4ff66c7..509fab02d8a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesBoolean {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesBoolean {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a4271593547..7234016ff96 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -114,7 +114,7 @@ public class AdditionalPropertiesClass {
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -122,7 +122,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -147,7 +147,7 @@ public class AdditionalPropertiesClass {
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -155,7 +155,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -180,7 +180,7 @@ public class AdditionalPropertiesClass {
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -188,7 +188,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -213,7 +213,7 @@ public class AdditionalPropertiesClass {
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -221,7 +221,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -246,7 +246,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -254,7 +254,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -279,7 +279,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -287,7 +287,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -312,7 +312,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -320,7 +320,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -345,7 +345,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -353,7 +353,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -370,7 +370,7 @@ public class AdditionalPropertiesClass {
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -378,7 +378,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -395,7 +395,7 @@ public class AdditionalPropertiesClass {
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -403,7 +403,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -420,7 +420,7 @@ public class AdditionalPropertiesClass {
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -428,7 +428,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index f84eb037573..89df7723d44 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesInteger {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesInteger {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 1efe49749df..96be54b277e 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesNumber {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesNumber {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index fd7a2bdcc6b..e52a4456ca2 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 40bb58f247b..ecc06add09b 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesString {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesString {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
index 762ce1ea840..e1d4d805c82 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
@@ -71,7 +71,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -79,7 +79,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index b98cafbbbce..4cc84bbc2ab 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -71,7 +71,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index cfed0670014..134f60a31ef 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -63,7 +63,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -71,7 +71,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
index dac39d2b9a7..f8d129483f8 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -73,7 +73,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -81,7 +81,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -106,7 +106,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -114,7 +114,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -139,7 +139,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -147,7 +147,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
index 657ed427dba..a40f9d59476 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BigCat.java
@@ -101,7 +101,7 @@ public class BigCat extends Cat {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -109,7 +109,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
index 660e37085ac..b40a09ba0ea 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -102,7 +102,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -110,7 +110,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -127,7 +127,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -135,7 +135,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -152,7 +152,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -160,7 +160,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -177,7 +177,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -185,7 +185,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -202,7 +202,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -210,7 +210,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
index 37b88ce8392..32d94ea0e0c 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
@@ -65,7 +65,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -73,7 +73,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
index 6f93cc06f76..a1a8b50ce17 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d79b6426ba..ed88bd95c91 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -52,7 +52,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -60,7 +60,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
index 7974fd221a5..4f301ba7fa5 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
index c65f99508fb..6f5340ae638 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
@@ -62,7 +62,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -70,7 +70,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
index 4bf6b5b8adc..a6ddc12711a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -129,7 +129,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -137,7 +137,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -162,7 +162,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -170,7 +170,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
index 7fd6743e859..7582662f1b6 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -218,7 +218,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -226,7 +226,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -243,7 +243,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -251,7 +251,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -268,7 +268,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -276,7 +276,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -293,7 +293,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -301,7 +301,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -318,7 +318,7 @@ public class EnumTest {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -326,7 +326,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index f918f74ed26..7fb3ec15d83 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -60,7 +60,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -68,7 +68,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -93,7 +93,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -101,7 +101,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
index a23084be7de..8f1fc37a4e3 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -125,7 +125,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -133,7 +133,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -152,7 +152,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -160,7 +160,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -177,7 +177,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -185,7 +185,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -204,7 +204,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -212,7 +212,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -231,7 +231,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -239,7 +239,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -258,7 +258,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -266,7 +266,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -283,7 +283,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -291,7 +291,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -308,7 +308,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -316,7 +316,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -333,7 +333,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -341,7 +341,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -358,7 +358,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -366,7 +366,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -383,7 +383,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -391,7 +391,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -408,7 +408,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -416,7 +416,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -433,7 +433,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -441,7 +441,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -458,7 +458,7 @@ public class FormatTest {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -466,7 +466,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 17cca6a2320..9f0c0cc4fc5 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -63,7 +63,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -78,7 +78,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
index a91343d4e39..c038bf4bed7 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
@@ -112,7 +112,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -120,7 +120,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -145,7 +145,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -153,7 +153,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -178,7 +178,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -186,7 +186,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -211,7 +211,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -219,7 +219,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 5568c4597fe..b6b1a7fe2ca 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -75,7 +75,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -92,7 +92,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -100,7 +100,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -125,7 +125,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -133,7 +133,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
index 3f582ce9966..2db77a7e154 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -58,7 +58,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -66,7 +66,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -83,7 +83,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -91,7 +91,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 3afd743b68c..8785ead7f9a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -88,7 +88,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -96,7 +96,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,7 +113,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -121,7 +121,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
index 573a0f09ae4..ee94ca72349 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -53,7 +53,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -61,7 +61,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
index c443b42e2fa..c8ad5a307f3 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
index 488f0dfe2ab..441e6b8844b 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -53,7 +53,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -61,7 +61,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
index d59aaa66fd0..ab6dae15f68 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -97,7 +97,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -117,7 +117,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -125,7 +125,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -137,7 +137,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
index 8df7be2d2cb..47079120d64 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -53,7 +53,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -61,7 +61,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
index 0de7c4fd5aa..98ad072ef64 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -140,7 +140,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -148,7 +148,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -165,7 +165,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -173,7 +173,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,7 +190,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -198,7 +198,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -215,7 +215,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -223,7 +223,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -240,7 +240,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -248,7 +248,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
index bd9277f2cdb..871f76488c9 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -63,7 +63,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -71,7 +71,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -88,7 +88,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -96,7 +96,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -113,7 +113,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -121,7 +121,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
index 007f5360513..2748ec3e5bc 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -171,7 +171,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -179,7 +179,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -204,7 +204,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -213,7 +213,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -238,7 +238,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -246,7 +246,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -263,7 +263,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -271,7 +271,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index b0eebf16a2b..9bef3dbf783 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -60,7 +60,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -80,7 +80,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -88,7 +88,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 94252cf596d..284775c73d0 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
index 19ff6fb3898..b134681ce37 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -82,7 +82,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -90,7 +90,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 5d1b1f95715..8c4625176d2 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -75,7 +75,7 @@ public class TypeHolderDefault {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -83,7 +83,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -100,7 +100,7 @@ public class TypeHolderDefault {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -108,7 +108,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -125,7 +125,7 @@ public class TypeHolderDefault {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -133,7 +133,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -150,7 +150,7 @@ public class TypeHolderDefault {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -158,7 +158,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -183,7 +183,7 @@ public class TypeHolderDefault {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -191,7 +191,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index a6e5a79a951..28e6de7315a 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -80,7 +80,7 @@ public class TypeHolderExample {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -88,7 +88,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -105,7 +105,7 @@ public class TypeHolderExample {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -113,7 +113,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -130,7 +130,7 @@ public class TypeHolderExample {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -138,7 +138,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -155,7 +155,7 @@ public class TypeHolderExample {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -163,7 +163,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -180,7 +180,7 @@ public class TypeHolderExample {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -188,7 +188,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -213,7 +213,7 @@ public class TypeHolderExample {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -221,7 +221,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
index 19ee89b4614..17888e808d6 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -112,7 +112,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -120,7 +120,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -137,7 +137,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -145,7 +145,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -162,7 +162,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -170,7 +170,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -187,7 +187,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -195,7 +195,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -212,7 +212,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -220,7 +220,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -237,7 +237,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -245,7 +245,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -262,7 +262,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -270,7 +270,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
index 6fb1e58896d..60ebd664c90 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -195,7 +195,7 @@ public class XmlItem {
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -203,7 +203,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -220,7 +220,7 @@ public class XmlItem {
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -228,7 +228,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -245,7 +245,7 @@ public class XmlItem {
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -253,7 +253,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -270,7 +270,7 @@ public class XmlItem {
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -278,7 +278,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -303,7 +303,7 @@ public class XmlItem {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -311,7 +311,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -328,7 +328,7 @@ public class XmlItem {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -336,7 +336,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -353,7 +353,7 @@ public class XmlItem {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -361,7 +361,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -378,7 +378,7 @@ public class XmlItem {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -386,7 +386,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -403,7 +403,7 @@ public class XmlItem {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -411,7 +411,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -436,7 +436,7 @@ public class XmlItem {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -444,7 +444,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -469,7 +469,7 @@ public class XmlItem {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -477,7 +477,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -494,7 +494,7 @@ public class XmlItem {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -502,7 +502,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -519,7 +519,7 @@ public class XmlItem {
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -527,7 +527,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -544,7 +544,7 @@ public class XmlItem {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -552,7 +552,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -569,7 +569,7 @@ public class XmlItem {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -577,7 +577,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -602,7 +602,7 @@ public class XmlItem {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -610,7 +610,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -635,7 +635,7 @@ public class XmlItem {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -643,7 +643,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -660,7 +660,7 @@ public class XmlItem {
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -668,7 +668,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -685,7 +685,7 @@ public class XmlItem {
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -693,7 +693,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -710,7 +710,7 @@ public class XmlItem {
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -718,7 +718,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -735,7 +735,7 @@ public class XmlItem {
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -743,7 +743,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -768,7 +768,7 @@ public class XmlItem {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -776,7 +776,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -801,7 +801,7 @@ public class XmlItem {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -809,7 +809,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -826,7 +826,7 @@ public class XmlItem {
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -834,7 +834,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -851,7 +851,7 @@ public class XmlItem {
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -859,7 +859,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -876,7 +876,7 @@ public class XmlItem {
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -884,7 +884,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -901,7 +901,7 @@ public class XmlItem {
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -909,7 +909,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -934,7 +934,7 @@ public class XmlItem {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -942,7 +942,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -967,7 +967,7 @@ public class XmlItem {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -975,7 +975,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java b/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
index 309c6be14f5..d63d15f8dfb 100644
--- a/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
+++ b/samples/client/petstore/java/jersey3-oneOf/src/main/java/org/openapitools/client/model/SchemaA.java
@@ -53,7 +53,7 @@ public class SchemaA {
    * @return propA
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropA() {
@@ -61,7 +61,7 @@ public class SchemaA {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP_A)
+  @JsonProperty(value = JSON_PROPERTY_PROP_A, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropA(@jakarta.annotation.Nullable String propA) {
     this.propA = propA;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 7e8bf2513e9..19c1ec494c8 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -105,7 +105,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -113,7 +113,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -140,7 +140,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -148,7 +148,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -172,7 +172,7 @@ public class AdditionalPropertiesClass {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -200,7 +200,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype1() {
@@ -208,7 +208,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@jakarta.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -226,7 +226,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype2() {
@@ -234,7 +234,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@jakarta.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -260,7 +260,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
@@ -268,7 +268,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@jakarta.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -286,7 +286,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getEmptyMap() {
@@ -294,7 +294,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@jakarta.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -320,7 +320,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
@@ -328,7 +328,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@jakarta.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
index d0904fddcae..891b863ca51 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Animal.java
@@ -76,7 +76,7 @@ public class Animal {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -84,7 +84,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -102,7 +102,7 @@ public class Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -110,7 +110,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
index 2f9adffa344..a38e4ab44df 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Apple.java
@@ -63,7 +63,7 @@ public class Apple {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="^[a-zA-Z\\s]*$")
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCultivar() {
@@ -71,7 +71,7 @@ public class Apple {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@jakarta.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -89,7 +89,7 @@ public class Apple {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/^[A-Z\\s]*$/i")
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOrigin() {
@@ -97,7 +97,7 @@ public class Apple {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@jakarta.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
index f685ac9ce5d..3fe8656c029 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -64,7 +64,7 @@ public class AppleReq {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getCultivar() {
@@ -72,7 +72,7 @@ public class AppleReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@jakarta.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -90,7 +90,7 @@ public class AppleReq {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMealy() {
@@ -98,7 +98,7 @@ public class AppleReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@jakarta.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 44a3b0e65fc..2b4004fd7de 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public class ArrayOfArrayOfNumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -77,7 +77,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 305ea65f710..93c63bc240a 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public class ArrayOfNumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -77,7 +77,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
index 89c0a9f8414..22917c7343a 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -78,7 +78,7 @@ public class ArrayTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -86,7 +86,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -113,7 +113,7 @@ public class ArrayTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -121,7 +121,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -148,7 +148,7 @@ public class ArrayTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -156,7 +156,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
index faf2b839937..c49709825c0 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Banana.java
@@ -60,7 +60,7 @@ public class Banana {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getLengthCm() {
@@ -68,7 +68,7 @@ public class Banana {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@jakarta.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
index 293cd9bd584..ea709d1d49e 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -66,7 +66,7 @@ public class BananaReq {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getLengthCm() {
@@ -74,7 +74,7 @@ public class BananaReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@jakarta.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -92,7 +92,7 @@ public class BananaReq {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getSweet() {
@@ -100,7 +100,7 @@ public class BananaReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@jakarta.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
index bc6c3f9f388..768d4bbd7ac 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -58,7 +58,7 @@ public class BasquePig {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -66,7 +66,7 @@ public class BasquePig {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
index a91d77bf59d..239f06866b3 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -82,7 +82,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -90,7 +90,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -108,7 +108,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -116,7 +116,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -134,7 +134,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -142,7 +142,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -160,7 +160,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -168,7 +168,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -186,7 +186,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -194,7 +194,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -212,7 +212,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -220,7 +220,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
index 831cd6473de..d2fdc98f3cd 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Cat.java
@@ -72,7 +72,7 @@ public class Cat extends Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -80,7 +80,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
index 132a97f8a14..f5bb478cfd8 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Category.java
@@ -62,7 +62,7 @@ public class Category {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -89,7 +89,7 @@ public class Category {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -97,7 +97,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
index ca01b62706a..9d7b7ce7cc6 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -78,7 +78,7 @@ public class ChildCat extends ParentPet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -86,7 +86,7 @@ public class ChildCat extends ParentPet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
@@ -112,7 +112,7 @@ public class ChildCat extends ParentPet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPetType() {
@@ -120,7 +120,7 @@ public class ChildCat extends ParentPet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@jakarta.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
index be21fbd47a5..64fac0042e6 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -57,7 +57,7 @@ public class ClassModel {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -65,7 +65,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
index e6887790370..37349316226 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Client.java
@@ -57,7 +57,7 @@ public class Client {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -65,7 +65,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index 749824c5e81..94101af82b2 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -67,7 +67,7 @@ public class ComplexQuadrilateral {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -75,7 +75,7 @@ public class ComplexQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -94,7 +94,7 @@ public class ComplexQuadrilateral {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -102,7 +102,7 @@ public class ComplexQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
index 1ab5593c747..55fbc25e5f6 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -58,7 +58,7 @@ public class DanishPig {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -66,7 +66,7 @@ public class DanishPig {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index b3b7e019a3a..f56753fe690 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -59,7 +59,7 @@ public class DeprecatedObject {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
index 973191757aa..d8b0ddea2e5 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Dog.java
@@ -71,7 +71,7 @@ public class Dog extends Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -79,7 +79,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
index 9688ea12133..eafa78975f8 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Drawing.java
@@ -85,7 +85,7 @@ public class Drawing {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Shape getMainShape() {
@@ -93,7 +93,7 @@ public class Drawing {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@jakarta.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -118,7 +118,7 @@ public class Drawing {
         return shapeOrNull.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<ShapeOrNull> getShapeOrNull_JsonNullable() {
@@ -153,7 +153,7 @@ public class Drawing {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -190,7 +190,7 @@ public class Drawing {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Shape> getShapes() {
@@ -198,7 +198,7 @@ public class Drawing {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@jakarta.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
index 3eceb4708d3..9e55ba0a882 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -134,7 +134,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -142,7 +142,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -168,7 +168,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -176,7 +176,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
index ae70bec7d17..3012ee98253 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -284,7 +284,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -292,7 +292,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -311,7 +311,7 @@ public class EnumTest {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -319,7 +319,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -337,7 +337,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -345,7 +345,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -363,7 +363,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
@@ -371,7 +371,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@jakarta.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -389,7 +389,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -397,7 +397,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -422,7 +422,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -451,7 +451,7 @@ public class EnumTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -459,7 +459,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -478,7 +478,7 @@ public class EnumTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -486,7 +486,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -505,7 +505,7 @@ public class EnumTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -513,7 +513,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index 9df45528f01..8077cf54f2d 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -67,7 +67,7 @@ public class EquilateralTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -75,7 +75,7 @@ public class EquilateralTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -94,7 +94,7 @@ public class EquilateralTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -102,7 +102,7 @@ public class EquilateralTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 71f0185cd4b..23773bafe00 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -66,7 +66,7 @@ public class FileSchemaTestClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -74,7 +74,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -101,7 +101,7 @@ public class FileSchemaTestClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -109,7 +109,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
index 062fb2c52d0..c86f3948c65 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Foo.java
@@ -57,7 +57,7 @@ public class Foo {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -65,7 +65,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 2b0275421af..e3b1d35f4e5 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -68,7 +68,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
index 938ead6ded2..9c053b18adf 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -140,7 +140,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -148,7 +148,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -168,7 +168,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -176,7 +176,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -194,7 +194,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -202,7 +202,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -224,7 +224,7 @@ public class FormatTest {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -232,7 +232,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -252,7 +252,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -260,7 +260,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -280,7 +280,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -288,7 +288,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -307,7 +307,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -315,7 +315,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -333,7 +333,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -341,7 +341,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -360,7 +360,7 @@ public class FormatTest {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -368,7 +368,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -387,7 +387,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -395,7 +395,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -415,7 +415,7 @@ public class FormatTest {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -423,7 +423,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -442,7 +442,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -450,7 +450,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -469,7 +469,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -477,7 +477,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -496,7 +496,7 @@ public class FormatTest {
   @jakarta.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -504,7 +504,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -522,7 +522,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="^\\d{10}$")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -530,7 +530,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -548,7 +548,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/^image_\\d{1,3}$/i")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -556,7 +556,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index fa160c59d5a..2a43ed84667 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -71,7 +71,7 @@ public class GrandparentAnimal {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPetType() {
@@ -79,7 +79,7 @@ public class GrandparentAnimal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@jakarta.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index d0c1efaf1de..e9a5c97ee88 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -68,7 +68,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -84,7 +84,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index c9486a08bad..6c29e049a5b 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -66,7 +66,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 8d2f314f243..f7cad836282 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -63,7 +63,7 @@ public class IsoscelesTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -71,7 +71,7 @@ public class IsoscelesTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -90,7 +90,7 @@ public class IsoscelesTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -98,7 +98,7 @@ public class IsoscelesTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
index cc9dfc98847..a6f6b23ab00 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MapTest.java
@@ -118,7 +118,7 @@ public class MapTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -126,7 +126,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -152,7 +152,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -160,7 +160,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -186,7 +186,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -194,7 +194,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -220,7 +220,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -228,7 +228,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 47fbbe7f88e..f2a6a08ccae 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -81,7 +81,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -100,7 +100,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -108,7 +108,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -135,7 +135,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -143,7 +143,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
index a61ca3fab08..fa1ab72dba0 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -63,7 +63,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -71,7 +71,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -89,7 +89,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -97,7 +97,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 5a19fb5ff83..f5b571ebbf9 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -68,7 +68,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -76,7 +76,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -94,7 +94,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -102,7 +102,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -120,7 +120,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -128,7 +128,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
index c5087f32483..d03c6a230fe 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -58,7 +58,7 @@ public class ModelFile {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -66,7 +66,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
index a2d7fcae01e..45c89c5bf85 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelList.java
@@ -58,7 +58,7 @@ public class ModelList {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -66,7 +66,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
index 0fe64813220..0523a2be4ad 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -58,7 +58,7 @@ public class ModelReturn {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -66,7 +66,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
index 34b42f2429f..daf8e5c84ff 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Name.java
@@ -83,7 +83,7 @@ public class Name {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -91,7 +91,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -104,7 +104,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -125,7 +125,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -133,7 +133,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -146,7 +146,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
index 8e161772e7e..7882f28c5e2 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -123,7 +123,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -158,7 +158,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -192,7 +192,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -261,7 +261,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -296,7 +296,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -342,7 +342,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -388,7 +388,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -424,7 +424,7 @@ public class NullableClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -432,7 +432,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -468,7 +468,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -514,7 +514,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -550,7 +550,7 @@ public class NullableClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -558,7 +558,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
index 41df1fe90ec..513545770e1 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -59,7 +59,7 @@ public class NumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -67,7 +67,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index edfd6c35617..fad17af34b1 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -79,7 +79,7 @@ public class ObjectWithDeprecatedFields {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -87,7 +87,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -109,7 +109,7 @@ public class ObjectWithDeprecatedFields {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -118,7 +118,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -140,7 +140,7 @@ public class ObjectWithDeprecatedFields {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -149,7 +149,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -178,7 +178,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -187,7 +187,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
index 7ee5f36792d..26a4b066e0f 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Order.java
@@ -120,7 +120,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -154,7 +154,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -172,7 +172,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -180,7 +180,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -199,7 +199,7 @@ public class Order {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -207,7 +207,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -225,7 +225,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -233,7 +233,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -251,7 +251,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -259,7 +259,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
index 96d0cb226c6..f1a4fcb3dd3 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -69,7 +69,7 @@ public class OuterComposite {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -77,7 +77,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -95,7 +95,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -103,7 +103,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -121,7 +121,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -129,7 +129,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
index 4e7b36a3a92..24583e24f6c 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,7 +123,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -131,7 +131,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -150,7 +150,7 @@ public class Pet {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -158,7 +158,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -177,7 +177,7 @@ public class Pet {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -185,7 +185,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -212,7 +212,7 @@ public class Pet {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -220,7 +220,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -247,7 +247,7 @@ public class Pet {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -255,7 +255,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -273,7 +273,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -281,7 +281,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index d12ca28f606..1e59fa958eb 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -58,7 +58,7 @@ public class QuadrilateralInterface {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -66,7 +66,7 @@ public class QuadrilateralInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index c8162694107..617144e3405 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -65,7 +65,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -86,7 +86,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -94,7 +94,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 75d6d678331..71b9e594baf 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -67,7 +67,7 @@ public class ScaleneTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -75,7 +75,7 @@ public class ScaleneTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -94,7 +94,7 @@ public class ScaleneTriangle {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -102,7 +102,7 @@ public class ScaleneTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
index cbd23267bc9..441cbabcdb3 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -58,7 +58,7 @@ public class ShapeInterface {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -66,7 +66,7 @@ public class ShapeInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 251faf32324..94b8e05c3ff 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -67,7 +67,7 @@ public class SimpleQuadrilateral {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -75,7 +75,7 @@ public class SimpleQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@jakarta.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -94,7 +94,7 @@ public class SimpleQuadrilateral {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -102,7 +102,7 @@ public class SimpleQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@jakarta.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 88b02205d4c..cad2bc05f46 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -63,7 +63,7 @@ public class SpecialModelName {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -71,7 +71,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -89,7 +89,7 @@ public class SpecialModelName {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSpecialModelName() {
@@ -97,7 +97,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@jakarta.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
index 480ed80f815..f70def4ee66 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Tag.java
@@ -62,7 +62,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -70,7 +70,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 9deb8e42eb8..5cf53d94cc0 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -62,7 +62,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -70,7 +70,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
index b6ee99810d6..2670df4047e 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -58,7 +58,7 @@ public class TriangleInterface {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -66,7 +66,7 @@ public class TriangleInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@jakarta.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
index 243ad7db0a9..e3285b54b13 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/User.java
@@ -113,7 +113,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -139,7 +139,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -147,7 +147,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -165,7 +165,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -173,7 +173,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -191,7 +191,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -199,7 +199,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -217,7 +217,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -225,7 +225,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -243,7 +243,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -251,7 +251,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -269,7 +269,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -277,7 +277,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -295,7 +295,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -303,7 +303,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -321,7 +321,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getObjectWithNoDeclaredProps() {
@@ -329,7 +329,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@jakarta.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -353,7 +353,7 @@ public class User {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -387,7 +387,7 @@ public class User {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -421,7 +421,7 @@ public class User {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
index 74f14d907fc..3eecc513f93 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Whale.java
@@ -68,7 +68,7 @@ public class Whale {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasBaleen() {
@@ -76,7 +76,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@jakarta.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -94,7 +94,7 @@ public class Whale {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasTeeth() {
@@ -102,7 +102,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@jakarta.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -121,7 +121,7 @@ public class Whale {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -129,7 +129,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
index 947ca9ce466..f3169d12698 100644
--- a/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/jersey3/src/main/java/org/openapitools/client/model/Zebra.java
@@ -104,7 +104,7 @@ public class Zebra {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class Zebra {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -131,7 +131,7 @@ public class Zebra {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -139,7 +139,7 @@ public class Zebra {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Category.java
index 46b73b36878..fb2a6df6b92 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Category.java
@@ -48,7 +48,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -57,7 +57,7 @@ public class Category  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -72,7 +72,7 @@ public class Category  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -81,7 +81,7 @@ public class Category  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 6531ab9e376..31a0ba63137 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -54,7 +54,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
@@ -63,7 +63,7 @@ public class ModelApiResponse  {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(Integer code) {
     this.code = code;
@@ -78,7 +78,7 @@ public class ModelApiResponse  {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
@@ -87,7 +87,7 @@ public class ModelApiResponse  {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(String type) {
     this.type = type;
@@ -102,7 +102,7 @@ public class ModelApiResponse  {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
@@ -111,7 +111,7 @@ public class ModelApiResponse  {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Order.java
index 07a5b214ab9..e2b33bc02bd 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Order.java
@@ -104,7 +104,7 @@ public class Order  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -113,7 +113,7 @@ public class Order  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class Order  {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
@@ -137,7 +137,7 @@ public class Order  {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(Long petId) {
     this.petId = petId;
@@ -152,7 +152,7 @@ public class Order  {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
@@ -161,7 +161,7 @@ public class Order  {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(Integer quantity) {
     this.quantity = quantity;
@@ -176,7 +176,7 @@ public class Order  {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getShipDate() {
     return shipDate;
@@ -185,7 +185,7 @@ public class Order  {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(Date shipDate) {
     this.shipDate = shipDate;
@@ -200,7 +200,7 @@ public class Order  {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -209,7 +209,7 @@ public class Order  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
@@ -224,7 +224,7 @@ public class Order  {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
@@ -233,7 +233,7 @@ public class Order  {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Pet.java
index 5f40b703388..00fd6a640de 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Pet.java
@@ -108,7 +108,7 @@ public class Pet  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -117,7 +117,7 @@ public class Pet  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -132,7 +132,7 @@ public class Pet  {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
@@ -141,7 +141,7 @@ public class Pet  {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(Category category) {
     this.category = category;
@@ -156,7 +156,7 @@ public class Pet  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -165,7 +165,7 @@ public class Pet  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
@@ -180,7 +180,7 @@ public class Pet  {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
@@ -189,7 +189,7 @@ public class Pet  {
   /**
    * Set photoUrls
    */
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -212,7 +212,7 @@ public class Pet  {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
@@ -221,7 +221,7 @@ public class Pet  {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(List<Tag> tags) {
     this.tags = tags;
@@ -246,7 +246,7 @@ public class Pet  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -255,7 +255,7 @@ public class Pet  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Tag.java
index 21bfb71f68b..aa1d2fbd439 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/Tag.java
@@ -48,7 +48,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -57,7 +57,7 @@ public class Tag  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -72,7 +72,7 @@ public class Tag  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -81,7 +81,7 @@ public class Tag  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/User.java
index 04ec9f8d768..fd0a47b7a2a 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-mutiny/src/main/java/org/openapitools/client/model/User.java
@@ -81,7 +81,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -90,7 +90,7 @@ public class User  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -105,7 +105,7 @@ public class User  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -114,7 +114,7 @@ public class User  {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -129,7 +129,7 @@ public class User  {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
@@ -138,7 +138,7 @@ public class User  {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(String firstName) {
     this.firstName = firstName;
@@ -153,7 +153,7 @@ public class User  {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
@@ -162,7 +162,7 @@ public class User  {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(String lastName) {
     this.lastName = lastName;
@@ -177,7 +177,7 @@ public class User  {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
@@ -186,7 +186,7 @@ public class User  {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(String email) {
     this.email = email;
@@ -201,7 +201,7 @@ public class User  {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
@@ -210,7 +210,7 @@ public class User  {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(String password) {
     this.password = password;
@@ -225,7 +225,7 @@ public class User  {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
@@ -234,7 +234,7 @@ public class User  {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(String phone) {
     this.phone = phone;
@@ -249,7 +249,7 @@ public class User  {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
@@ -258,7 +258,7 @@ public class User  {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
index 61fc1862849..175536c48db 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Category.java
@@ -59,7 +59,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -69,7 +69,7 @@ public class Category  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -85,7 +85,7 @@ public class Category  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -95,7 +95,7 @@ public class Category  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 4ef13f11df3..13609451c4e 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,7 +65,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public Integer getCode() {
@@ -75,7 +75,7 @@ public class ModelApiResponse  {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public void setCode(Integer code) {
@@ -91,7 +91,7 @@ public class ModelApiResponse  {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public String getType() {
@@ -101,7 +101,7 @@ public class ModelApiResponse  {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(String type) {
@@ -117,7 +117,7 @@ public class ModelApiResponse  {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public String getMessage() {
@@ -127,7 +127,7 @@ public class ModelApiResponse  {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public void setMessage(String message) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
index b942a9b2fa4..fd163e6f314 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public class Order  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -126,7 +126,7 @@ public class Order  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -142,7 +142,7 @@ public class Order  {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public Long getPetId() {
@@ -152,7 +152,7 @@ public class Order  {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public void setPetId(Long petId) {
@@ -168,7 +168,7 @@ public class Order  {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public Integer getQuantity() {
@@ -178,7 +178,7 @@ public class Order  {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public void setQuantity(Integer quantity) {
@@ -194,7 +194,7 @@ public class Order  {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public Date getShipDate() {
@@ -204,7 +204,7 @@ public class Order  {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public void setShipDate(Date shipDate) {
@@ -220,7 +220,7 @@ public class Order  {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
    public String getStatus() {
@@ -233,7 +233,7 @@ public class Order  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(StatusEnum status) {
@@ -249,7 +249,7 @@ public class Order  {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public Boolean getComplete() {
@@ -259,7 +259,7 @@ public class Order  {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public void setComplete(Boolean complete) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
index c70012e839d..8e81c6eb672 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public class Pet  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -132,7 +132,7 @@ public class Pet  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -148,7 +148,7 @@ public class Pet  {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public Category getCategory() {
@@ -158,7 +158,7 @@ public class Pet  {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public void setCategory(Category category) {
@@ -174,7 +174,7 @@ public class Pet  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -184,7 +184,7 @@ public class Pet  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
@@ -200,7 +200,7 @@ public class Pet  {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrl", useWrapping = true)
@@ -211,7 +211,7 @@ public class Pet  {
   /**
    * Set photoUrls
    */
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrl", useWrapping = true)
@@ -236,7 +236,7 @@ public class Pet  {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -247,7 +247,7 @@ public class Pet  {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -274,7 +274,7 @@ public class Pet  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
    public String getStatus() {
@@ -287,7 +287,7 @@ public class Pet  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(StatusEnum status) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
index 562946c04ea..ff358af4ba2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,7 +59,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -69,7 +69,7 @@ public class Tag  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -85,7 +85,7 @@ public class Tag  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public String getName() {
@@ -95,7 +95,7 @@ public class Tag  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(String name) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
index 10708b47a1a..de8cfd45f1d 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson-with-xml/src/main/java/org/openapitools/client/model/User.java
@@ -92,7 +92,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public Long getId() {
@@ -102,7 +102,7 @@ public class User  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(Long id) {
@@ -118,7 +118,7 @@ public class User  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public String getUsername() {
@@ -128,7 +128,7 @@ public class User  {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(String username) {
@@ -144,7 +144,7 @@ public class User  {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public String getFirstName() {
@@ -154,7 +154,7 @@ public class User  {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public void setFirstName(String firstName) {
@@ -170,7 +170,7 @@ public class User  {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public String getLastName() {
@@ -180,7 +180,7 @@ public class User  {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public void setLastName(String lastName) {
@@ -196,7 +196,7 @@ public class User  {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public String getEmail() {
@@ -206,7 +206,7 @@ public class User  {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public void setEmail(String email) {
@@ -222,7 +222,7 @@ public class User  {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public String getPassword() {
@@ -232,7 +232,7 @@ public class User  {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(String password) {
@@ -248,7 +248,7 @@ public class User  {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public String getPhone() {
@@ -258,7 +258,7 @@ public class User  {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public void setPhone(String phone) {
@@ -274,7 +274,7 @@ public class User  {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public Integer getUserStatus() {
@@ -284,7 +284,7 @@ public class User  {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public void setUserStatus(Integer userStatus) {
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 0354b66a397..e5ddc33bd87 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -49,7 +49,7 @@ public class AdditionalPropertiesClass  {
    * Get mapProperty
    * @return mapProperty
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
@@ -58,7 +58,7 @@ public class AdditionalPropertiesClass  {
   /**
    * Set mapProperty
    */
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -81,7 +81,7 @@ public class AdditionalPropertiesClass  {
    * Get mapOfMapProperty
    * @return mapOfMapProperty
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
@@ -90,7 +90,7 @@ public class AdditionalPropertiesClass  {
   /**
    * Set mapOfMapProperty
    */
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 7469d9ecd94..19a452ada7e 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -48,7 +48,7 @@ public class AllOfWithSingleRef  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -57,7 +57,7 @@ public class AllOfWithSingleRef  {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -72,7 +72,7 @@ public class AllOfWithSingleRef  {
    * Get singleRefType
    * @return singleRefType
    **/
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public SingleRefType getSingleRefType() {
     return singleRefType;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef  {
   /**
    * Set singleRefType
    */
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
index 6677658943b..f6fe599d53b 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Animal.java
@@ -60,7 +60,7 @@ public class Animal  {
    * Get className
    * @return className
    **/
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
@@ -69,7 +69,7 @@ public class Animal  {
   /**
    * Set className
    */
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(String className) {
     this.className = className;
@@ -84,7 +84,7 @@ public class Animal  {
    * Get color
    * @return color
    **/
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
@@ -93,7 +93,7 @@ public class Animal  {
   /**
    * Set color
    */
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 0b5c66a5fba..0095acfb135 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -46,7 +46,7 @@ public class ArrayOfArrayOfNumberOnly  {
    * Get arrayArrayNumber
    * @return arrayArrayNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
@@ -55,7 +55,7 @@ public class ArrayOfArrayOfNumberOnly  {
   /**
    * Set arrayArrayNumber
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 4be23980a0d..093e2d80b56 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -46,7 +46,7 @@ public class ArrayOfNumberOnly  {
    * Get arrayNumber
    * @return arrayNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
@@ -55,7 +55,7 @@ public class ArrayOfNumberOnly  {
   /**
    * Set arrayNumber
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
index c7dabc6e838..d015a89a42d 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -56,7 +56,7 @@ public class ArrayTest  {
    * Get arrayOfString
    * @return arrayOfString
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
@@ -65,7 +65,7 @@ public class ArrayTest  {
   /**
    * Set arrayOfString
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -88,7 +88,7 @@ public class ArrayTest  {
    * Get arrayArrayOfInteger
    * @return arrayArrayOfInteger
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
@@ -97,7 +97,7 @@ public class ArrayTest  {
   /**
    * Set arrayArrayOfInteger
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -120,7 +120,7 @@ public class ArrayTest  {
    * Get arrayArrayOfModel
    * @return arrayArrayOfModel
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
@@ -129,7 +129,7 @@ public class ArrayTest  {
   /**
    * Set arrayArrayOfModel
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
index ca0ed12acce..7d3e5df30d9 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -70,7 +70,7 @@ public class Capitalization  {
    * Get smallCamel
    * @return smallCamel
    **/
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
@@ -79,7 +79,7 @@ public class Capitalization  {
   /**
    * Set smallCamel
    */
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(String smallCamel) {
     this.smallCamel = smallCamel;
@@ -94,7 +94,7 @@ public class Capitalization  {
    * Get capitalCamel
    * @return capitalCamel
    **/
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
@@ -103,7 +103,7 @@ public class Capitalization  {
   /**
    * Set capitalCamel
    */
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -118,7 +118,7 @@ public class Capitalization  {
    * Get smallSnake
    * @return smallSnake
    **/
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
@@ -127,7 +127,7 @@ public class Capitalization  {
   /**
    * Set smallSnake
    */
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(String smallSnake) {
     this.smallSnake = smallSnake;
@@ -142,7 +142,7 @@ public class Capitalization  {
    * Get capitalSnake
    * @return capitalSnake
    **/
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
@@ -151,7 +151,7 @@ public class Capitalization  {
   /**
    * Set capitalSnake
    */
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -166,7 +166,7 @@ public class Capitalization  {
    * Get scAETHFlowPoints
    * @return scAETHFlowPoints
    **/
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
@@ -175,7 +175,7 @@ public class Capitalization  {
   /**
    * Set scAETHFlowPoints
    */
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -190,7 +190,7 @@ public class Capitalization  {
    * Name of the pet 
    * @return ATT_NAME
    **/
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
@@ -199,7 +199,7 @@ public class Capitalization  {
   /**
    * Set ATT_NAME
    */
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
index c1bb142a09a..6f2bb16131f 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Cat.java
@@ -52,7 +52,7 @@ public class Cat extends Animal {
    * Get declawed
    * @return declawed
    **/
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
@@ -61,7 +61,7 @@ public class Cat extends Animal {
   /**
    * Set declawed
    */
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
index 84669467914..c47cd7f1655 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Category.java
@@ -47,7 +47,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -56,7 +56,7 @@ public class Category  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -71,7 +71,7 @@ public class Category  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -80,7 +80,7 @@ public class Category  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index dcdb25dcf66..d003ac41d9c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -52,7 +52,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * Get otherProperty
    * @return otherProperty
    **/
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOtherProperty() {
     return otherProperty;
@@ -61,7 +61,7 @@ public class ChildWithNullable extends ParentWithNullable {
   /**
    * Set otherProperty
    */
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
index 8e1eb1ee3e0..127ed0fc357 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -45,7 +45,7 @@ public class ClassModel  {
    * Get propertyClass
    * @return propertyClass
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
@@ -54,7 +54,7 @@ public class ClassModel  {
   /**
    * Set propertyClass
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
index 9a1ad3a96c1..1ab85887966 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Client.java
@@ -42,7 +42,7 @@ public class Client  {
    * Get client
    * @return client
    **/
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
@@ -51,7 +51,7 @@ public class Client  {
   /**
    * Set client
    */
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 611c8759e1f..3e404a88111 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -42,7 +42,7 @@ public class DeprecatedObject  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -51,7 +51,7 @@ public class DeprecatedObject  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
index 2b966a99cc2..5a2ce86f156 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Dog.java
@@ -52,7 +52,7 @@ public class Dog extends Animal {
    * Get breed
    * @return breed
    **/
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
@@ -61,7 +61,7 @@ public class Dog extends Animal {
   /**
    * Set breed
    */
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
index 017a14a66bd..c3fd3f535c9 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -114,7 +114,7 @@ public class EnumArrays  {
    * Get justSymbol
    * @return justSymbol
    **/
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
@@ -123,7 +123,7 @@ public class EnumArrays  {
   /**
    * Set justSymbol
    */
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -138,7 +138,7 @@ public class EnumArrays  {
    * Get arrayEnum
    * @return arrayEnum
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
@@ -147,7 +147,7 @@ public class EnumArrays  {
   /**
    * Set arrayEnum
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
index 322885fb2ae..c2eb5fdfc72 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -210,7 +210,7 @@ public class EnumTest  {
    * Get enumString
    * @return enumString
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
@@ -219,7 +219,7 @@ public class EnumTest  {
   /**
    * Set enumString
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -234,7 +234,7 @@ public class EnumTest  {
    * Get enumStringRequired
    * @return enumStringRequired
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
@@ -243,7 +243,7 @@ public class EnumTest  {
   /**
    * Set enumStringRequired
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -258,7 +258,7 @@ public class EnumTest  {
    * Get enumInteger
    * @return enumInteger
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
@@ -267,7 +267,7 @@ public class EnumTest  {
   /**
    * Set enumInteger
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -282,7 +282,7 @@ public class EnumTest  {
    * Get enumNumber
    * @return enumNumber
    **/
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
@@ -291,7 +291,7 @@ public class EnumTest  {
   /**
    * Set enumNumber
    */
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -306,7 +306,7 @@ public class EnumTest  {
    * Get outerEnum
    * @return outerEnum
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnum getOuterEnum() {
     return outerEnum;
@@ -315,7 +315,7 @@ public class EnumTest  {
   /**
    * Set outerEnum
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
@@ -330,7 +330,7 @@ public class EnumTest  {
    * Get outerEnumInteger
    * @return outerEnumInteger
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
@@ -339,7 +339,7 @@ public class EnumTest  {
   /**
    * Set outerEnumInteger
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -354,7 +354,7 @@ public class EnumTest  {
    * Get outerEnumDefaultValue
    * @return outerEnumDefaultValue
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
@@ -363,7 +363,7 @@ public class EnumTest  {
   /**
    * Set outerEnumDefaultValue
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -378,7 +378,7 @@ public class EnumTest  {
    * Get outerEnumIntegerDefaultValue
    * @return outerEnumIntegerDefaultValue
    **/
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
@@ -387,7 +387,7 @@ public class EnumTest  {
   /**
    * Set outerEnumIntegerDefaultValue
    */
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 556e1774b82..dcf42bf76bc 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -51,7 +51,7 @@ public class FakeBigDecimalMap200Response  {
    * Get someId
    * @return someId
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
@@ -60,7 +60,7 @@ public class FakeBigDecimalMap200Response  {
   /**
    * Set someId
    */
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(BigDecimal someId) {
     this.someId = someId;
@@ -75,7 +75,7 @@ public class FakeBigDecimalMap200Response  {
    * Get someMap
    * @return someMap
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
@@ -84,7 +84,7 @@ public class FakeBigDecimalMap200Response  {
   /**
    * Set someMap
    */
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index b5fbcb8543a..9497c9330e0 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -51,7 +51,7 @@ public class FileSchemaTestClass  {
    * Get _file
    * @return _file
    **/
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
@@ -60,7 +60,7 @@ public class FileSchemaTestClass  {
   /**
    * Set _file
    */
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(ModelFile _file) {
     this._file = _file;
@@ -75,7 +75,7 @@ public class FileSchemaTestClass  {
    * Get files
    * @return files
    **/
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
@@ -84,7 +84,7 @@ public class FileSchemaTestClass  {
   /**
    * Set files
    */
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
index 95892d69a40..813a17df239 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Foo.java
@@ -42,7 +42,7 @@ public class Foo  {
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -51,7 +51,7 @@ public class Foo  {
   /**
    * Set bar
    */
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 508867aa7f9..08f9ee6f5f7 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -44,7 +44,7 @@ public class FooGetDefaultResponse  {
    * Get string
    * @return string
    **/
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
@@ -53,7 +53,7 @@ public class FooGetDefaultResponse  {
   /**
    * Set string
    */
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
index 4ec278fdc8b..7ecdfd5a2ff 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -130,7 +130,7 @@ public class FormatTest  {
    * maximum: 100
    * @return integer
    **/
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
@@ -139,7 +139,7 @@ public class FormatTest  {
   /**
    * Set integer
    */
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(Integer integer) {
     this.integer = integer;
@@ -156,7 +156,7 @@ public class FormatTest  {
    * maximum: 200
    * @return int32
    **/
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
@@ -165,7 +165,7 @@ public class FormatTest  {
   /**
    * Set int32
    */
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(Integer int32) {
     this.int32 = int32;
@@ -180,7 +180,7 @@ public class FormatTest  {
    * Get int64
    * @return int64
    **/
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
@@ -189,7 +189,7 @@ public class FormatTest  {
   /**
    * Set int64
    */
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(Long int64) {
     this.int64 = int64;
@@ -206,7 +206,7 @@ public class FormatTest  {
    * maximum: 543.2
    * @return number
    **/
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
@@ -215,7 +215,7 @@ public class FormatTest  {
   /**
    * Set number
    */
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(BigDecimal number) {
     this.number = number;
@@ -232,7 +232,7 @@ public class FormatTest  {
    * maximum: 987.6
    * @return _float
    **/
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
@@ -241,7 +241,7 @@ public class FormatTest  {
   /**
    * Set _float
    */
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(Float _float) {
     this._float = _float;
@@ -258,7 +258,7 @@ public class FormatTest  {
    * maximum: 123.4
    * @return _double
    **/
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
@@ -267,7 +267,7 @@ public class FormatTest  {
   /**
    * Set _double
    */
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(Double _double) {
     this._double = _double;
@@ -282,7 +282,7 @@ public class FormatTest  {
    * Get decimal
    * @return decimal
    **/
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
@@ -291,7 +291,7 @@ public class FormatTest  {
   /**
    * Set decimal
    */
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(BigDecimal decimal) {
     this.decimal = decimal;
@@ -306,7 +306,7 @@ public class FormatTest  {
    * Get string
    * @return string
    **/
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
@@ -315,7 +315,7 @@ public class FormatTest  {
   /**
    * Set string
    */
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(String string) {
     this.string = string;
@@ -330,7 +330,7 @@ public class FormatTest  {
    * Get _byte
    * @return _byte
    **/
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
@@ -339,7 +339,7 @@ public class FormatTest  {
   /**
    * Set _byte
    */
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(byte[] _byte) {
     this._byte = _byte;
@@ -354,7 +354,7 @@ public class FormatTest  {
    * Get binary
    * @return binary
    **/
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
@@ -363,7 +363,7 @@ public class FormatTest  {
   /**
    * Set binary
    */
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(File binary) {
     this.binary = binary;
@@ -378,7 +378,7 @@ public class FormatTest  {
    * Get date
    * @return date
    **/
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Date getDate() {
     return date;
@@ -387,7 +387,7 @@ public class FormatTest  {
   /**
    * Set date
    */
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(Date date) {
     this.date = date;
@@ -402,7 +402,7 @@ public class FormatTest  {
    * Get dateTime
    * @return dateTime
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateTime() {
     return dateTime;
@@ -411,7 +411,7 @@ public class FormatTest  {
   /**
    * Set dateTime
    */
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(Date dateTime) {
     this.dateTime = dateTime;
@@ -426,7 +426,7 @@ public class FormatTest  {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
@@ -435,7 +435,7 @@ public class FormatTest  {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(UUID uuid) {
     this.uuid = uuid;
@@ -450,7 +450,7 @@ public class FormatTest  {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
@@ -459,7 +459,7 @@ public class FormatTest  {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(String password) {
     this.password = password;
@@ -474,7 +474,7 @@ public class FormatTest  {
    * A string that is a 10 digit number. Can have leading zeros.
    * @return patternWithDigits
    **/
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
@@ -483,7 +483,7 @@ public class FormatTest  {
   /**
    * Set patternWithDigits
    */
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -498,7 +498,7 @@ public class FormatTest  {
    * A string starting with &#39;image_&#39; (case insensitive) and one to three digits following i.e. Image_01.
    * @return patternWithDigitsAndDelimiter
    **/
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
@@ -507,7 +507,7 @@ public class FormatTest  {
   /**
    * Set patternWithDigitsAndDelimiter
    */
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 1ceca0d6bd2..36a7d2fbe6d 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -60,7 +60,7 @@ public class HasOnlyReadOnly  {
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -71,7 +71,7 @@ public class HasOnlyReadOnly  {
    * Get foo
    * @return foo
    **/
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 4b7c119ff66..2420e5040df 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -45,7 +45,7 @@ public class HealthCheckResult  {
    * Get nullableMessage
    * @return nullableMessage
    **/
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getNullableMessage() {
     return nullableMessage;
@@ -54,7 +54,7 @@ public class HealthCheckResult  {
   /**
    * Set nullableMessage
    */
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNullableMessage(String nullableMessage) {
     this.nullableMessage = nullableMessage;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
index 19c6935aaf0..0e9e6ed6cf9 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MapTest.java
@@ -91,7 +91,7 @@ public class MapTest  {
    * Get mapMapOfString
    * @return mapMapOfString
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
@@ -100,7 +100,7 @@ public class MapTest  {
   /**
    * Set mapMapOfString
    */
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -123,7 +123,7 @@ public class MapTest  {
    * Get mapOfEnumString
    * @return mapOfEnumString
    **/
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
@@ -132,7 +132,7 @@ public class MapTest  {
   /**
    * Set mapOfEnumString
    */
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -155,7 +155,7 @@ public class MapTest  {
    * Get directMap
    * @return directMap
    **/
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
@@ -164,7 +164,7 @@ public class MapTest  {
   /**
    * Set directMap
    */
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -187,7 +187,7 @@ public class MapTest  {
    * Get indirectMap
    * @return indirectMap
    **/
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
@@ -196,7 +196,7 @@ public class MapTest  {
   /**
    * Set indirectMap
    */
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index ef409f2784e..e49082b3c17 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -57,7 +57,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
@@ -66,7 +66,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(UUID uuid) {
     this.uuid = uuid;
@@ -81,7 +81,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
    * Get dateTime
    * @return dateTime
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateTime() {
     return dateTime;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
   /**
    * Set dateTime
    */
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(Date dateTime) {
     this.dateTime = dateTime;
@@ -105,7 +105,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
    * Get map
    * @return map
    **/
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
@@ -114,7 +114,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass  {
   /**
    * Set map
    */
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
index 2ed59729546..582dae8d586 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -51,7 +51,7 @@ public class Model200Response  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
@@ -60,7 +60,7 @@ public class Model200Response  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(Integer name) {
     this.name = name;
@@ -75,7 +75,7 @@ public class Model200Response  {
    * Get propertyClass
    * @return propertyClass
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
@@ -84,7 +84,7 @@ public class Model200Response  {
   /**
    * Set propertyClass
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index ff29cadc48b..4f80ea548f6 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -53,7 +53,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
@@ -62,7 +62,7 @@ public class ModelApiResponse  {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(Integer code) {
     this.code = code;
@@ -77,7 +77,7 @@ public class ModelApiResponse  {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
@@ -86,7 +86,7 @@ public class ModelApiResponse  {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(String type) {
     this.type = type;
@@ -101,7 +101,7 @@ public class ModelApiResponse  {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
@@ -110,7 +110,7 @@ public class ModelApiResponse  {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
index 9fbfa0745f1..888498bd40c 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -49,7 +49,7 @@ public class ModelFile  {
    * Test capitalization
    * @return sourceURI
    **/
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
@@ -58,7 +58,7 @@ public class ModelFile  {
   /**
    * Set sourceURI
    */
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
index 76389d75e43..daeb4cf8bc3 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelList.java
@@ -43,7 +43,7 @@ public class ModelList  {
    * Get _123list
    * @return _123list
    **/
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
@@ -52,7 +52,7 @@ public class ModelList  {
   /**
    * Set _123list
    */
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
index 1bf4558bc91..ce5ed31fb4f 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -46,7 +46,7 @@ public class ModelReturn  {
    * Get _return
    * @return _return
    **/
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
@@ -55,7 +55,7 @@ public class ModelReturn  {
   /**
    * Set _return
    */
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
index e681959a4e8..1413bcea338 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Name.java
@@ -72,7 +72,7 @@ public class Name  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
@@ -81,7 +81,7 @@ public class Name  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name  {
    * Get snakeCase
    * @return snakeCase
    **/
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -107,7 +107,7 @@ public class Name  {
    * Get property
    * @return property
    **/
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
@@ -116,7 +116,7 @@ public class Name  {
   /**
    * Set property
    */
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(String property) {
     this.property = property;
@@ -131,7 +131,7 @@ public class Name  {
    * Get _123number
    * @return _123number
    **/
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
index 437cdf4273f..1e0b3171b64 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -147,7 +147,7 @@ public class NullableClass  {
    * Get integerProp
    * @return integerProp
    **/
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getIntegerProp() {
     return integerProp;
@@ -156,7 +156,7 @@ public class NullableClass  {
   /**
    * Set integerProp
    */
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntegerProp(Integer integerProp) {
     this.integerProp = integerProp;
@@ -171,7 +171,7 @@ public class NullableClass  {
    * Get numberProp
    * @return numberProp
    **/
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getNumberProp() {
     return numberProp;
@@ -180,7 +180,7 @@ public class NullableClass  {
   /**
    * Set numberProp
    */
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNumberProp(BigDecimal numberProp) {
     this.numberProp = numberProp;
@@ -195,7 +195,7 @@ public class NullableClass  {
    * Get booleanProp
    * @return booleanProp
    **/
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getBooleanProp() {
     return booleanProp;
@@ -204,7 +204,7 @@ public class NullableClass  {
   /**
    * Set booleanProp
    */
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBooleanProp(Boolean booleanProp) {
     this.booleanProp = booleanProp;
@@ -219,7 +219,7 @@ public class NullableClass  {
    * Get stringProp
    * @return stringProp
    **/
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getStringProp() {
     return stringProp;
@@ -228,7 +228,7 @@ public class NullableClass  {
   /**
    * Set stringProp
    */
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringProp(String stringProp) {
     this.stringProp = stringProp;
@@ -243,7 +243,7 @@ public class NullableClass  {
    * Get dateProp
    * @return dateProp
    **/
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDateProp() {
     return dateProp;
@@ -252,7 +252,7 @@ public class NullableClass  {
   /**
    * Set dateProp
    */
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateProp(Date dateProp) {
     this.dateProp = dateProp;
@@ -267,7 +267,7 @@ public class NullableClass  {
    * Get datetimeProp
    * @return datetimeProp
    **/
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getDatetimeProp() {
     return datetimeProp;
@@ -276,7 +276,7 @@ public class NullableClass  {
   /**
    * Set datetimeProp
    */
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDatetimeProp(Date datetimeProp) {
     this.datetimeProp = datetimeProp;
@@ -291,7 +291,7 @@ public class NullableClass  {
    * Get arrayNullableProp
    * @return arrayNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayNullableProp() {
     return arrayNullableProp;
@@ -300,7 +300,7 @@ public class NullableClass  {
   /**
    * Set arrayNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNullableProp(List<Object> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
@@ -323,7 +323,7 @@ public class NullableClass  {
    * Get arrayAndItemsNullableProp
    * @return arrayAndItemsNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayAndItemsNullableProp() {
     return arrayAndItemsNullableProp;
@@ -332,7 +332,7 @@ public class NullableClass  {
   /**
    * Set arrayAndItemsNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayAndItemsNullableProp(List<Object> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
@@ -355,7 +355,7 @@ public class NullableClass  {
    * Get arrayItemsNullable
    * @return arrayItemsNullable
    **/
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
@@ -364,7 +364,7 @@ public class NullableClass  {
   /**
    * Set arrayItemsNullable
    */
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -387,7 +387,7 @@ public class NullableClass  {
    * Get objectNullableProp
    * @return objectNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectNullableProp() {
     return objectNullableProp;
@@ -396,7 +396,7 @@ public class NullableClass  {
   /**
    * Set objectNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectNullableProp(Map<String, Object> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
@@ -419,7 +419,7 @@ public class NullableClass  {
    * Get objectAndItemsNullableProp
    * @return objectAndItemsNullableProp
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectAndItemsNullableProp() {
     return objectAndItemsNullableProp;
@@ -428,7 +428,7 @@ public class NullableClass  {
   /**
    * Set objectAndItemsNullableProp
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectAndItemsNullableProp(Map<String, Object> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
@@ -451,7 +451,7 @@ public class NullableClass  {
    * Get objectItemsNullable
    * @return objectItemsNullable
    **/
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass  {
   /**
    * Set objectItemsNullable
    */
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
index ee2c68ff315..5f53ae658c8 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -43,7 +43,7 @@ public class NumberOnly  {
    * Get justNumber
    * @return justNumber
    **/
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
@@ -52,7 +52,7 @@ public class NumberOnly  {
   /**
    * Set justNumber
    */
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 0c40349a930..40e9c0778e2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -62,7 +62,7 @@ public class ObjectWithDeprecatedFields  {
    * Get uuid
    * @return uuid
    **/
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
@@ -71,7 +71,7 @@ public class ObjectWithDeprecatedFields  {
   /**
    * Set uuid
    */
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(String uuid) {
     this.uuid = uuid;
@@ -88,7 +88,7 @@ public class ObjectWithDeprecatedFields  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(BigDecimal id) {
     this.id = id;
@@ -114,7 +114,7 @@ public class ObjectWithDeprecatedFields  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
@@ -123,7 +123,7 @@ public class ObjectWithDeprecatedFields  {
   /**
    * Set deprecatedRef
    */
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -140,7 +140,7 @@ public class ObjectWithDeprecatedFields  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
@@ -149,7 +149,7 @@ public class ObjectWithDeprecatedFields  {
   /**
    * Set bars
    */
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
index 829c874d169..35690b36320 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Order.java
@@ -103,7 +103,7 @@ public class Order  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -112,7 +112,7 @@ public class Order  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -127,7 +127,7 @@ public class Order  {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
@@ -136,7 +136,7 @@ public class Order  {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(Long petId) {
     this.petId = petId;
@@ -151,7 +151,7 @@ public class Order  {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
@@ -160,7 +160,7 @@ public class Order  {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(Integer quantity) {
     this.quantity = quantity;
@@ -175,7 +175,7 @@ public class Order  {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getShipDate() {
     return shipDate;
@@ -184,7 +184,7 @@ public class Order  {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(Date shipDate) {
     this.shipDate = shipDate;
@@ -199,7 +199,7 @@ public class Order  {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -208,7 +208,7 @@ public class Order  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
@@ -223,7 +223,7 @@ public class Order  {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
@@ -232,7 +232,7 @@ public class Order  {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
index e2917e9aec0..3a9063ae886 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -53,7 +53,7 @@ public class OuterComposite  {
    * Get myNumber
    * @return myNumber
    **/
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
@@ -62,7 +62,7 @@ public class OuterComposite  {
   /**
    * Set myNumber
    */
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -77,7 +77,7 @@ public class OuterComposite  {
    * Get myString
    * @return myString
    **/
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
@@ -86,7 +86,7 @@ public class OuterComposite  {
   /**
    * Set myString
    */
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(String myString) {
     this.myString = myString;
@@ -101,7 +101,7 @@ public class OuterComposite  {
    * Get myBoolean
    * @return myBoolean
    **/
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
@@ -110,7 +110,7 @@ public class OuterComposite  {
   /**
    * Set myBoolean
    */
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 6cbb441875d..66d50f0c6d4 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -43,7 +43,7 @@ public class OuterObjectWithEnumProperty  {
    * Get value
    * @return value
    **/
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public OuterEnumInteger getValue() {
     return value;
@@ -52,7 +52,7 @@ public class OuterObjectWithEnumProperty  {
   /**
    * Set value
    */
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index a4cd3c7c792..d8ecc7f0a4e 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -91,7 +91,7 @@ public class ParentWithNullable  {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
@@ -100,7 +100,7 @@ public class ParentWithNullable  {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(TypeEnum type) {
     this.type = type;
@@ -115,7 +115,7 @@ public class ParentWithNullable  {
    * Get nullableProperty
    * @return nullableProperty
    **/
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getNullableProperty() {
     return nullableProperty;
@@ -124,7 +124,7 @@ public class ParentWithNullable  {
   /**
    * Set nullableProperty
    */
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNullableProperty(String nullableProperty) {
     this.nullableProperty = nullableProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
index b9da2c6d91e..f435638173a 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Pet.java
@@ -110,7 +110,7 @@ public class Pet  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -119,7 +119,7 @@ public class Pet  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -134,7 +134,7 @@ public class Pet  {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
@@ -143,7 +143,7 @@ public class Pet  {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(Category category) {
     this.category = category;
@@ -158,7 +158,7 @@ public class Pet  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -167,7 +167,7 @@ public class Pet  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
@@ -182,7 +182,7 @@ public class Pet  {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Set<String> getPhotoUrls() {
     return photoUrls;
@@ -192,7 +192,7 @@ public class Pet  {
    * Set photoUrls
    */
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -215,7 +215,7 @@ public class Pet  {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
@@ -224,7 +224,7 @@ public class Pet  {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(List<Tag> tags) {
     this.tags = tags;
@@ -247,7 +247,7 @@ public class Pet  {
    * pet status in the store
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -256,7 +256,7 @@ public class Pet  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 87bb00535f5..e304cb423d8 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -57,7 +57,7 @@ public class ReadOnlyFirst  {
    * Get bar
    * @return bar
    **/
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -68,7 +68,7 @@ public class ReadOnlyFirst  {
    * Get baz
    * @return baz
    **/
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
@@ -77,7 +77,7 @@ public class ReadOnlyFirst  {
   /**
    * Set baz
    */
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
index bb65c5c1e26..dd4e4d51147 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -43,7 +43,7 @@ public class SpecialModelName  {
    * Get $specialPropertyName
    * @return $specialPropertyName
    **/
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
@@ -52,7 +52,7 @@ public class SpecialModelName  {
   /**
    * Set $specialPropertyName
    */
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
index 782de436506..78a4994e991 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/Tag.java
@@ -47,7 +47,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -56,7 +56,7 @@ public class Tag  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -71,7 +71,7 @@ public class Tag  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -80,7 +80,7 @@ public class Tag  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index b55e7b75c29..210204020b2 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -86,7 +86,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest  {
    * Get someProperty
    * @return someProperty
    **/
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
@@ -95,7 +95,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest  {
   /**
    * Set someProperty
    */
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
index 76c4f6853eb..67986847eb1 100644
--- a/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/microprofile-rest-client-3.0-jackson/src/main/java/org/openapitools/client/model/User.java
@@ -80,7 +80,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -89,7 +89,7 @@ public class User  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -104,7 +104,7 @@ public class User  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -113,7 +113,7 @@ public class User  {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -128,7 +128,7 @@ public class User  {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
@@ -137,7 +137,7 @@ public class User  {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(String firstName) {
     this.firstName = firstName;
@@ -152,7 +152,7 @@ public class User  {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
@@ -161,7 +161,7 @@ public class User  {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(String lastName) {
     this.lastName = lastName;
@@ -176,7 +176,7 @@ public class User  {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
@@ -185,7 +185,7 @@ public class User  {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(String email) {
     this.email = email;
@@ -200,7 +200,7 @@ public class User  {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
@@ -209,7 +209,7 @@ public class User  {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(String password) {
     this.password = password;
@@ -224,7 +224,7 @@ public class User  {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
@@ -233,7 +233,7 @@ public class User  {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(String phone) {
     this.phone = phone;
@@ -248,7 +248,7 @@ public class User  {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
@@ -257,7 +257,7 @@ public class User  {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 273e5c4e443..6203fcc32ea 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -103,14 +103,14 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -135,14 +135,14 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -164,7 +164,7 @@ public class AdditionalPropertiesClass {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -191,14 +191,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype1() {
     return mapWithUndeclaredPropertiesAnytype1;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -215,14 +215,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype2() {
     return mapWithUndeclaredPropertiesAnytype2;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -247,14 +247,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
     return mapWithUndeclaredPropertiesAnytype3;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -271,14 +271,14 @@ public class AdditionalPropertiesClass {
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getEmptyMap() {
     return emptyMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -303,14 +303,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
     return mapWithUndeclaredPropertiesString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
index 3a070bc8287..9985e57b243 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Animal.java
@@ -74,14 +74,14 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -98,14 +98,14 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
index 3479968fc46..209f99324ec 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Apple.java
@@ -60,14 +60,14 @@ public class Apple {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -84,14 +84,14 @@ public class Apple {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOrigin() {
     return origin;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
index d6580a5560a..943ed221e1e 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -60,14 +60,14 @@ public class AppleReq {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -84,14 +84,14 @@ public class AppleReq {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMealy() {
     return mealy;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 9a075aa0931..bf0e784b132 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -66,14 +66,14 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 739fd802ab9..5f81b605a8b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -66,14 +66,14 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
index 7d5ad1c241a..f4c589d6d76 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -76,14 +76,14 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -108,14 +108,14 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -140,14 +140,14 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
index e49f3f7b3c4..31a852ad24d 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Banana.java
@@ -56,14 +56,14 @@ public class Banana {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
index bb9dad61f1e..1ade230fa85 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -61,14 +61,14 @@ public class BananaReq {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -85,14 +85,14 @@ public class BananaReq {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getSweet() {
     return sweet;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
index 67517bb09fa..ee24232d46c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -55,14 +55,14 @@ public class BasquePig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
index d66d057dfae..522f186420f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -80,14 +80,14 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -104,14 +104,14 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -128,14 +128,14 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -152,14 +152,14 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -176,14 +176,14 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,14 +200,14 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
index ec8e8f26951..7bf01cf6a3b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Cat.java
@@ -67,14 +67,14 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
index 697c52fe717..a6f68dcd656 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Category.java
@@ -60,14 +60,14 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
index 73607f6c8df..105517cef06 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -73,14 +73,14 @@ public class ChildCat extends ParentPet {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -105,14 +105,14 @@ public class ChildCat extends ParentPet {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
index c76ff089086..6db0fb6fde1 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -55,14 +55,14 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
index fcdb70adb09..def75a9d7ca 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Client.java
@@ -55,14 +55,14 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index f47ddeca221..c64d5b36bf6 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -60,14 +60,14 @@ public class ComplexQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,14 +84,14 @@ public class ComplexQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
index caee9a124c2..55c18d0fa18 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -55,14 +55,14 @@ public class DanishPig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 1c0023c9901..781544464e7 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -57,14 +57,14 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
index 6a48f515f22..07d47eacebb 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Dog.java
@@ -66,14 +66,14 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
index a9e055ef926..eac73d2e05b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Drawing.java
@@ -83,14 +83,14 @@ public class Drawing {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Shape getMainShape() {
     return mainShape;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -107,14 +107,14 @@ public class Drawing {
    * @return shapeOrNull
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ShapeOrNull getShapeOrNull() {
     return shapeOrNull;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
     this.shapeOrNull = shapeOrNull;
@@ -136,7 +136,7 @@ public class Drawing {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -171,14 +171,14 @@ public class Drawing {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Shape> getShapes() {
     return shapes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
index a904c4ff9d0..2e6860ff2a6 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -132,14 +132,14 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,14 +164,14 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
index b72371b7bcb..a0f2359c5ab 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -281,14 +281,14 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -305,14 +305,14 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -329,14 +329,14 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -353,14 +353,14 @@ public class EnumTest {
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
     return enumIntegerOnly;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -377,14 +377,14 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -406,7 +406,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -433,14 +433,14 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -457,14 +457,14 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -481,14 +481,14 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index 977db1970f7..0664d09c8ee 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -60,14 +60,14 @@ public class EquilateralTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,14 +84,14 @@ public class EquilateralTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index ed234f495bd..77a990b6623 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -63,14 +63,14 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -95,14 +95,14 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 815bbd2d8e8..11a0a4edb56 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -63,14 +63,14 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -95,14 +95,14 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
index 23836b3697c..0133e435d48 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Foo.java
@@ -55,14 +55,14 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b7d03157e72..1aa86130597 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -56,14 +56,14 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
index ddc5434c8a3..82486070a07 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -137,14 +137,14 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -163,14 +163,14 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -187,14 +187,14 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -213,14 +213,14 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,14 +239,14 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -265,14 +265,14 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -289,14 +289,14 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -313,14 +313,14 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -337,14 +337,14 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -361,14 +361,14 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -385,14 +385,14 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public LocalDate getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -409,14 +409,14 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -433,14 +433,14 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -457,14 +457,14 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -481,14 +481,14 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -505,14 +505,14 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index 197804ac683..ed44ae7685d 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -69,14 +69,14 @@ public class GrandparentAnimal {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 697eca755a5..9978e53c3db 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -65,7 +65,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -79,7 +79,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 84410e511ae..ab18f1c46fa 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -63,7 +63,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 5ee277a1fb8..70e451abe68 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -60,14 +60,14 @@ public class IsoscelesTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,14 +84,14 @@ public class IsoscelesTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
index 97eb9e32cbc..2690457f47e 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MapTest.java
@@ -115,14 +115,14 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -147,14 +147,14 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -179,14 +179,14 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -211,14 +211,14 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 698a0dfd83e..83c72537a7e 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -70,14 +70,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -94,14 +94,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -126,14 +126,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
index 9d9009e0d97..54778b44615 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -60,14 +60,14 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -84,14 +84,14 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 010e0d82b30..3c09f251908 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,14 +65,14 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,14 +89,14 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -113,14 +113,14 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
index d233df8a40e..3cdf542341f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -55,14 +55,14 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
index 1f23bb31267..0fdfe2d9a10 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelList.java
@@ -55,14 +55,14 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
index 5d5eb607a78..1f1c20eb6ec 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -55,14 +55,14 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
index be626a3417e..7c24de85136 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Name.java
@@ -80,14 +80,14 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -99,7 +99,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -118,14 +118,14 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -137,7 +137,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
index 383ab3b2c67..0a56ec9d127 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -120,7 +120,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -152,7 +152,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -184,7 +184,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -216,7 +216,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -248,7 +248,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -280,7 +280,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -324,7 +324,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -368,7 +368,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -403,14 +403,14 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -444,7 +444,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -488,7 +488,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -523,14 +523,14 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
index 305ea00b06e..8250e1c9a5f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -56,14 +56,14 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index a688abc8c1c..eec5723f2c4 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -74,14 +74,14 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -100,14 +100,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -126,14 +126,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -160,14 +160,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
index 9f71d96892e..1e29f87050c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Order.java
@@ -118,14 +118,14 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,14 +142,14 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,14 +166,14 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,14 +190,14 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -214,14 +214,14 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,14 +238,14 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
index 1ae80f55325..9bc67b48804 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -66,14 +66,14 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -90,14 +90,14 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -114,14 +114,14 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
index 190903e5da1..8cd92c2da9b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,14 +121,14 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,14 +145,14 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -169,14 +169,14 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -201,14 +201,14 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,14 +233,14 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -257,14 +257,14 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index 0fdb7d9846e..9d3037ee7ef 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -55,14 +55,14 @@ public class QuadrilateralInterface {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 6dc9fa80698..ce4bdcbe08b 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -63,7 +63,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -82,14 +82,14 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 42f6b6e3ca2..baee4f2ffd2 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -60,14 +60,14 @@ public class ScaleneTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,14 +84,14 @@ public class ScaleneTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
index 33cbf1468c3..12f884999dc 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -55,14 +55,14 @@ public class ShapeInterface {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 2bd8ed8cee7..5727bb30d7a 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -60,14 +60,14 @@ public class SimpleQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,14 +84,14 @@ public class SimpleQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 4c68c65e101..725f927a688 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -60,14 +60,14 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -84,14 +84,14 @@ public class SpecialModelName {
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSpecialModelName() {
     return specialModelName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
index 1f3d1b70d43..c001523c795 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,14 +60,14 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 5009106af44..1f040a0612f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -59,14 +59,14 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
index a42e130202e..79e0da32b0f 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -55,14 +55,14 @@ public class TriangleInterface {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
index df3c1d62a1d..95f1f98f673 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/User.java
@@ -111,14 +111,14 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -135,14 +135,14 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -159,14 +159,14 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -183,14 +183,14 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -207,14 +207,14 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -231,14 +231,14 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -255,14 +255,14 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -279,14 +279,14 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -303,14 +303,14 @@ public class User {
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getObjectWithNoDeclaredProps() {
     return objectWithNoDeclaredProps;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -332,7 +332,7 @@ public class User {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -364,7 +364,7 @@ public class User {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -396,7 +396,7 @@ public class User {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
index 6915209da7e..8a9d1d911ee 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Whale.java
@@ -65,14 +65,14 @@ public class Whale {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasBaleen() {
     return hasBaleen;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -89,14 +89,14 @@ public class Whale {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasTeeth() {
     return hasTeeth;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -113,14 +113,14 @@ public class Whale {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
index f243b140473..6418fdd087d 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Zebra.java
@@ -101,14 +101,14 @@ public class Zebra {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -125,14 +125,14 @@ public class Zebra {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
index 2cf25a2f999..b468b8e5d4a 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -60,14 +60,14 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index d3006b6d90e..4ca9e881d6d 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,14 +65,14 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,14 +89,14 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -113,14 +113,14 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
index 5f26e5ea72b..7d371a731fe 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -118,14 +118,14 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -142,14 +142,14 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -166,14 +166,14 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -190,14 +190,14 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -214,14 +214,14 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,14 +238,14 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index 0583aea38c8..d1d4085f29b 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,14 +121,14 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,14 +145,14 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -169,14 +169,14 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -201,14 +201,14 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -233,14 +233,14 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -259,14 +259,14 @@ public class Pet {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index c1167878632..0acdf6fa6aa 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,14 +60,14 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -84,14 +84,14 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
index ac81688d3e5..c5f2f711d66 100644
--- a/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -90,14 +90,14 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -114,14 +114,14 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -138,14 +138,14 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -162,14 +162,14 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -186,14 +186,14 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -210,14 +210,14 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -234,14 +234,14 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -258,14 +258,14 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 4d5873ff4be..a369b87ae28 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -105,14 +105,14 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapProperty() {
     return mapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -137,14 +137,14 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapOfMapProperty() {
     return mapOfMapProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -166,7 +166,7 @@ public class AdditionalPropertiesClass {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -193,14 +193,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype1() {
     return mapWithUndeclaredPropertiesAnytype1;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -217,14 +217,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getMapWithUndeclaredPropertiesAnytype2() {
     return mapWithUndeclaredPropertiesAnytype2;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -249,14 +249,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
     return mapWithUndeclaredPropertiesAnytype3;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -273,14 +273,14 @@ public class AdditionalPropertiesClass {
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getEmptyMap() {
     return emptyMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -305,14 +305,14 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
     return mapWithUndeclaredPropertiesString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
index 8c4120f43c3..c7ade34dcf8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Animal.java
@@ -76,14 +76,14 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -100,14 +100,14 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getColor() {
     return color;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
index 7208141b66e..89ebbba9f08 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Apple.java
@@ -62,14 +62,14 @@ public class Apple {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -86,14 +86,14 @@ public class Apple {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getOrigin() {
     return origin;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
index 1fc9194c0a2..8dc311927f0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -62,14 +62,14 @@ public class AppleReq {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getCultivar() {
     return cultivar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -86,14 +86,14 @@ public class AppleReq {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMealy() {
     return mealy;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index cf74edc4da5..b6ab26fd392 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -68,14 +68,14 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<BigDecimal>> getArrayArrayNumber() {
     return arrayArrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index e055897bc83..7b103825b27 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -68,14 +68,14 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<BigDecimal> getArrayNumber() {
     return arrayNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
index c48a63105c5..31f126664e3 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -78,14 +78,14 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getArrayOfString() {
     return arrayOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -110,14 +110,14 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<Long>> getArrayArrayOfInteger() {
     return arrayArrayOfInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -142,14 +142,14 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
     return arrayArrayOfModel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
index 655edeb7bd3..61a49897f95 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Banana.java
@@ -58,14 +58,14 @@ public class Banana {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
index 0f0c5016c79..bf3538f8fee 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -63,14 +63,14 @@ public class BananaReq {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getLengthCm() {
     return lengthCm;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -87,14 +87,14 @@ public class BananaReq {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getSweet() {
     return sweet;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
index 7a5337831d0..311ee80f802 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -57,14 +57,14 @@ public class BasquePig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
index 51296c35d41..293fef0613d 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -82,14 +82,14 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallCamel() {
     return smallCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -106,14 +106,14 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalCamel() {
     return capitalCamel;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -130,14 +130,14 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSmallSnake() {
     return smallSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -154,14 +154,14 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getCapitalSnake() {
     return capitalSnake;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -178,14 +178,14 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getScAETHFlowPoints() {
     return scAETHFlowPoints;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -202,14 +202,14 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getATTNAME() {
     return ATT_NAME;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
index f5bd7cfc618..ba8e0027d07 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Cat.java
@@ -69,14 +69,14 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getDeclawed() {
     return declawed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
index 3fe366d4531..8b5f1175a2e 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Category.java
@@ -62,14 +62,14 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,14 +86,14 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
index fbf01365599..5da7dc88372 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -75,14 +75,14 @@ public class ChildCat extends ParentPet {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -107,14 +107,14 @@ public class ChildCat extends ParentPet {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
index 3fc8f53290e..266138705a1 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -57,14 +57,14 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
index 858c2faca44..d1f3c580323 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Client.java
@@ -57,14 +57,14 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getClient() {
     return client;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index 8597a09b728..0413d1ff74a 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -62,14 +62,14 @@ public class ComplexQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -86,14 +86,14 @@ public class ComplexQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
index c8979d5657a..8dddd7f1e39 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -57,14 +57,14 @@ public class DanishPig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 34d6a368aba..1a7f3ad403b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -59,14 +59,14 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
index 57738a491c5..002a0ebdffa 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Dog.java
@@ -68,14 +68,14 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBreed() {
     return breed;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
index 736e513b91e..2de6deb0713 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Drawing.java
@@ -85,14 +85,14 @@ public class Drawing {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Shape getMainShape() {
     return mainShape;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -109,14 +109,14 @@ public class Drawing {
    * @return shapeOrNull
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ShapeOrNull getShapeOrNull() {
     return shapeOrNull;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapeOrNull(@javax.annotation.Nullable ShapeOrNull shapeOrNull) {
     this.shapeOrNull = shapeOrNull;
@@ -138,7 +138,7 @@ public class Drawing {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -173,14 +173,14 @@ public class Drawing {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Shape> getShapes() {
     return shapes;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
index 042102f55db..ea3f5cb3103 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -134,14 +134,14 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public JustSymbolEnum getJustSymbol() {
     return justSymbol;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -166,14 +166,14 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ArrayEnumEnum> getArrayEnum() {
     return arrayEnum;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
index 8bb98473445..818c7281d64 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -283,14 +283,14 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumStringEnum getEnumString() {
     return enumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -307,14 +307,14 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public EnumStringRequiredEnum getEnumStringRequired() {
     return enumStringRequired;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -331,14 +331,14 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerEnum getEnumInteger() {
     return enumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -355,14 +355,14 @@ public class EnumTest {
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
     return enumIntegerOnly;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -379,14 +379,14 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public EnumNumberEnum getEnumNumber() {
     return enumNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -408,7 +408,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -435,14 +435,14 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -459,14 +459,14 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
     return outerEnumDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -483,14 +483,14 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
     return outerEnumIntegerDefaultValue;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index e32d754481c..f76722a19c2 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -62,14 +62,14 @@ public class EquilateralTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -86,14 +86,14 @@ public class EquilateralTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index b07c8b48e04..5c34272a5a8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -65,14 +65,14 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getSomeId() {
     return someId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -97,14 +97,14 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, BigDecimal> getSomeMap() {
     return someMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 48665cd8949..805c0babbd7 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -65,14 +65,14 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public ModelFile getFile() {
     return _file;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -97,14 +97,14 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<ModelFile> getFiles() {
     return files;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
index 64331c187b7..54ec257f8ed 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Foo.java
@@ -57,14 +57,14 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 96cde0a9187..90c9302b8d7 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -58,14 +58,14 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Foo getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
index 03ff756440b..5c98c183607 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -139,14 +139,14 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInteger() {
     return integer;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -165,14 +165,14 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getInt32() {
     return int32;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -189,14 +189,14 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getInt64() {
     return int64;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -215,14 +215,14 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public BigDecimal getNumber() {
     return number;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -241,14 +241,14 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Float getFloat() {
     return _float;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -267,14 +267,14 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Double getDouble() {
     return _double;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,14 +291,14 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getDecimal() {
     return decimal;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -315,14 +315,14 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getString() {
     return string;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -339,14 +339,14 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public byte[] getByte() {
     return _byte;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -363,14 +363,14 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public File getBinary() {
     return binary;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -387,14 +387,14 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public LocalDate getDate() {
     return date;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -411,14 +411,14 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -435,14 +435,14 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -459,14 +459,14 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -483,14 +483,14 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigits() {
     return patternWithDigits;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -507,14 +507,14 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPatternWithDigitsAndDelimiter() {
     return patternWithDigitsAndDelimiter;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index 1bba7dff3bc..a6e3ac4e04a 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -71,14 +71,14 @@ public class GrandparentAnimal {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getPetType() {
     return petType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index a78aa3516d0..3eafe6e94e8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -67,7 +67,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -81,7 +81,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFoo() {
     return foo;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index bb041ee2a52..681ab15f173 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -65,7 +65,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 65fd85df9f9..5a5707264dc 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -62,14 +62,14 @@ public class IsoscelesTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -86,14 +86,14 @@ public class IsoscelesTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
index d175d24f263..b221c7b6ad0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MapTest.java
@@ -117,14 +117,14 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Map<String, String>> getMapMapOfString() {
     return mapMapOfString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -149,14 +149,14 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, InnerEnum> getMapOfEnumString() {
     return mapOfEnumString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -181,14 +181,14 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getDirectMap() {
     return directMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -213,14 +213,14 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Boolean> getIndirectMap() {
     return indirectMap;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 73cb44a3468..8e4ef0780d0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -72,14 +72,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public UUID getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -96,14 +96,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getDateTime() {
     return dateTime;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -128,14 +128,14 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Animal> getMap() {
     return map;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
index e8340c41380..111afd50b5f 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -62,14 +62,14 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -86,14 +86,14 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPropertyClass() {
     return propertyClass;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index fa5d0110f22..81f78519fc8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -67,14 +67,14 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -91,14 +91,14 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -115,14 +115,14 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
index b9265f67f0a..e89344ba925 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -57,14 +57,14 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSourceURI() {
     return sourceURI;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
index 032474560ba..457d3abaa9c 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelList.java
@@ -57,14 +57,14 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String get123list() {
     return _123list;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
index 1f6a48c3898..07916edda29 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -57,14 +57,14 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getReturn() {
     return _return;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
index 7c94b56f879..440415993e3 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Name.java
@@ -82,14 +82,14 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public Integer getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -101,7 +101,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getSnakeCase() {
     return snakeCase;
@@ -120,14 +120,14 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getProperty() {
     return property;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -139,7 +139,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer get123number() {
     return _123number;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
index cdad5996870..7b99a712d2a 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -122,7 +122,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -154,7 +154,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -186,7 +186,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -218,7 +218,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -250,7 +250,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -282,7 +282,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -326,7 +326,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -370,7 +370,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -405,14 +405,14 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Object> getArrayItemsNullable() {
     return arrayItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -446,7 +446,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -490,7 +490,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -525,14 +525,14 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public Map<String, Object> getObjectItemsNullable() {
     return objectItemsNullable;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
index 53b210b4804..e70dff802fd 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -58,14 +58,14 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getJustNumber() {
     return justNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index c20a4eb052b..d6e304269e7 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -76,14 +76,14 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUuid() {
     return uuid;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -102,14 +102,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -128,14 +128,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public DeprecatedObject getDeprecatedRef() {
     return deprecatedRef;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -162,14 +162,14 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<String> getBars() {
     return bars;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
index 956861c2cbe..e065abae925 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Order.java
@@ -120,14 +120,14 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,14 +144,14 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -168,14 +168,14 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -192,14 +192,14 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public OffsetDateTime getShipDate() {
     return shipDate;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -216,14 +216,14 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -240,14 +240,14 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
index ccf90445ee9..b2ece85058b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -68,14 +68,14 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public BigDecimal getMyNumber() {
     return myNumber;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -92,14 +92,14 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMyString() {
     return myString;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -116,14 +116,14 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getMyBoolean() {
     return myBoolean;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
index 92d1a7d1306..229b2c99fcf 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,14 +123,14 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -147,14 +147,14 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -171,14 +171,14 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,14 +203,14 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -235,14 +235,14 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -259,14 +259,14 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index d9cc4c17c47..820af526bc8 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -57,14 +57,14 @@ public class QuadrilateralInterface {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 4fe79b07f20..1942e764750 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -65,7 +65,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBar() {
     return bar;
@@ -84,14 +84,14 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getBaz() {
     return baz;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 7714be27032..8691132bc5e 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -62,14 +62,14 @@ public class ScaleneTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -86,14 +86,14 @@ public class ScaleneTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
index 19aea705473..a73764fbb88 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -57,14 +57,14 @@ public class ShapeInterface {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index c4cdfa94f0a..e511e9c9cca 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -62,14 +62,14 @@ public class SimpleQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getShapeType() {
     return shapeType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -86,14 +86,14 @@ public class SimpleQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getQuadrilateralType() {
     return quadrilateralType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
index fdfcfb00782..8e6302729b2 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -62,14 +62,14 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long get$SpecialPropertyName() {
     return $specialPropertyName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -86,14 +86,14 @@ public class SpecialModelName {
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSpecialModelName() {
     return specialModelName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
index 50ad5fc31af..0b0e4a33ff0 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Tag.java
@@ -62,14 +62,14 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,14 +86,14 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 3e83584761d..d2c8814bc1b 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -61,14 +61,14 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getSomeProperty() {
     return someProperty;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
index e80c2b8d860..9fd045af981 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -57,14 +57,14 @@ public class TriangleInterface {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getTriangleType() {
     return triangleType;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
index 7fa85b46b2e..dd99e875406 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/User.java
@@ -113,14 +113,14 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -137,14 +137,14 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -161,14 +161,14 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -185,14 +185,14 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -209,14 +209,14 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -233,14 +233,14 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -257,14 +257,14 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -281,14 +281,14 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -305,14 +305,14 @@ public class User {
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Object getObjectWithNoDeclaredProps() {
     return objectWithNoDeclaredProps;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -334,7 +334,7 @@ public class User {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -366,7 +366,7 @@ public class User {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -398,7 +398,7 @@ public class User {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
index 5300ffcaacf..34ae9fc7be9 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Whale.java
@@ -67,14 +67,14 @@ public class Whale {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasBaleen() {
     return hasBaleen;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -91,14 +91,14 @@ public class Whale {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getHasTeeth() {
     return hasTeeth;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -115,14 +115,14 @@ public class Whale {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
index d9d51fcde2c..3b911f1cfa1 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Zebra.java
@@ -103,14 +103,14 @@ public class Zebra {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public TypeEnum getType() {
     return type;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -127,14 +127,14 @@ public class Zebra {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getClassName() {
     return className;
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 7afa7bb48b5..6055b22892e 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index 855f2d9d623..6121428a797 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -58,7 +58,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -66,7 +66,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 68775875488..d9374b57666 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 56819b671cb..3d75a07b7a4 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -116,7 +116,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -124,7 +124,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -151,7 +151,7 @@ public class AdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -159,7 +159,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -185,7 +185,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -193,7 +193,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -219,7 +219,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -227,7 +227,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -254,7 +254,7 @@ public class AdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -262,7 +262,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -289,7 +289,7 @@ public class AdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -297,7 +297,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -324,7 +324,7 @@ public class AdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -332,7 +332,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -359,7 +359,7 @@ public class AdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -367,7 +367,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -385,7 +385,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -393,7 +393,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -411,7 +411,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -419,7 +419,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -437,7 +437,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -445,7 +445,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index e84e6317c4f..b1eb603aa4e 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index b72954eac67..fe54f311f4b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -58,7 +58,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -66,7 +66,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index 98826a1db23..d94721bcf01 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index ddddf228184..1728f15e473 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
index c9a116326a0..2e95c940a22 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java
@@ -74,7 +74,7 @@ public class Animal {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -82,7 +82,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -100,7 +100,7 @@ public class Animal {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -108,7 +108,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 779ff1f19d3..8d2f5b6162c 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -67,7 +67,7 @@ public class ArrayOfArrayOfNumberOnly {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -75,7 +75,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 6e0d017b71c..495199831c8 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -67,7 +67,7 @@ public class ArrayOfNumberOnly {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -75,7 +75,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
index 68cf8438c6e..aa597c7a1fe 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -76,7 +76,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -84,7 +84,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -111,7 +111,7 @@ public class ArrayTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -119,7 +119,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -146,7 +146,7 @@ public class ArrayTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -154,7 +154,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
index 98a5cca7f7f..938cafae62a 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/BigCat.java
@@ -104,7 +104,7 @@ public class BigCat extends Cat {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -112,7 +112,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
index 9dfda2d3180..8152205c52d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -79,7 +79,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -87,7 +87,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -105,7 +105,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -113,7 +113,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -131,7 +131,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -139,7 +139,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -157,7 +157,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -165,7 +165,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -183,7 +183,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -191,7 +191,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -209,7 +209,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -217,7 +217,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
index d3bd1afe5dc..d6ec0d15112 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Cat.java
@@ -68,7 +68,7 @@ public class Cat extends Animal {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isDeclawed() {
@@ -76,7 +76,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
index 2da83a34e05..2ba68545ce4 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Category.java
@@ -59,7 +59,7 @@ public class Category {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,7 +86,7 @@ public class Category {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -94,7 +94,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
index 1dda713f1b7..670aec2c85f 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -54,7 +54,7 @@ public class ClassModel {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -62,7 +62,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
index c8d8fb1ec76..b5d59b9146c 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Client.java
@@ -54,7 +54,7 @@ public class Client {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -62,7 +62,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
index 4adc301bdd5..5dd9d7be240 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Dog.java
@@ -65,7 +65,7 @@ public class Dog extends Animal {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -73,7 +73,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
index 894ed7eebe0..f15fa1089ed 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -132,7 +132,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -140,7 +140,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -166,7 +166,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -174,7 +174,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
index 7c03dee5d93..40080b9878d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -220,7 +220,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -228,7 +228,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -247,7 +247,7 @@ public class EnumTest {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -255,7 +255,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -273,7 +273,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -281,7 +281,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -299,7 +299,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -307,7 +307,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -326,7 +326,7 @@ public class EnumTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -334,7 +334,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index cf168ea3e28..1f4296e0b4d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -64,7 +64,7 @@ public class FileSchemaTestClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -72,7 +72,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -99,7 +99,7 @@ public class FileSchemaTestClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -107,7 +107,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
index acfba72240e..828f7d185d6 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -127,7 +127,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -135,7 +135,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -155,7 +155,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -163,7 +163,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -181,7 +181,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -189,7 +189,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -211,7 +211,7 @@ public class FormatTest {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -219,7 +219,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -267,7 +267,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -275,7 +275,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -293,7 +293,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -301,7 +301,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -320,7 +320,7 @@ public class FormatTest {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -328,7 +328,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -347,7 +347,7 @@ public class FormatTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -355,7 +355,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -375,7 +375,7 @@ public class FormatTest {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -383,7 +383,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -402,7 +402,7 @@ public class FormatTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -410,7 +410,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -429,7 +429,7 @@ public class FormatTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -437,7 +437,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -456,7 +456,7 @@ public class FormatTest {
   @javax.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -464,7 +464,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -483,7 +483,7 @@ public class FormatTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -491,7 +491,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 5fda4c02961..acb213b0cf7 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -52,8 +52,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -66,7 +66,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -81,7 +81,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
index 4da05d15f82..c928a8ab241 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MapTest.java
@@ -115,7 +115,7 @@ public class MapTest {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -123,7 +123,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -149,7 +149,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -157,7 +157,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -183,7 +183,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -191,7 +191,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -217,7 +217,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -225,7 +225,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 178f69dcd0e..1cce93e243a 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -70,7 +70,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -78,7 +78,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -105,7 +105,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -132,7 +132,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -140,7 +140,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
index 9211e3da104..b78cee6f4b8 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -60,7 +60,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -68,7 +68,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -86,7 +86,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -94,7 +94,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index d9f351c6b20..af2a09bd4e1 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,7 +65,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -73,7 +73,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -91,7 +91,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -99,7 +99,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -117,7 +117,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -125,7 +125,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
index 5cb6b3a169c..8cb73b98202 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -55,7 +55,7 @@ public class ModelFile {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -63,7 +63,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
index 950f2d9d55f..52eb5b11ad2 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelList.java
@@ -55,7 +55,7 @@ public class ModelList {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -63,7 +63,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
index b3cc4261237..1fdee065951 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -55,7 +55,7 @@ public class ModelReturn {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -63,7 +63,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
index 243fe538383..4f7d1e4ccaa 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Name.java
@@ -61,8 +61,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -82,7 +82,7 @@ public class Name {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -90,7 +90,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -102,7 +102,7 @@ public class Name {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -123,7 +123,7 @@ public class Name {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -131,7 +131,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -143,7 +143,7 @@ public class Name {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
index a33a4768976..4e46a901b70 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -56,7 +56,7 @@ public class NumberOnly {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -64,7 +64,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
index 1fa5129bf50..b65e3d058ae 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Order.java
@@ -117,7 +117,7 @@ public class Order {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -143,7 +143,7 @@ public class Order {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -151,7 +151,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -169,7 +169,7 @@ public class Order {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -177,7 +177,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -196,7 +196,7 @@ public class Order {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -204,7 +204,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -222,7 +222,7 @@ public class Order {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -230,7 +230,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -248,7 +248,7 @@ public class Order {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isComplete() {
@@ -256,7 +256,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
index 8f3ce472db7..3780bc855f9 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -66,7 +66,7 @@ public class OuterComposite {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -74,7 +74,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -92,7 +92,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -100,7 +100,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -118,7 +118,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isMyBoolean() {
@@ -126,7 +126,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
index 06f7f8d89eb..21d894266c2 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java
@@ -124,7 +124,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -132,7 +132,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -151,7 +151,7 @@ public class Pet {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -159,7 +159,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -178,7 +178,7 @@ public class Pet {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -186,7 +186,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -213,7 +213,7 @@ public class Pet {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -222,7 +222,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -249,7 +249,7 @@ public class Pet {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -257,7 +257,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -275,7 +275,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -283,7 +283,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 2d61698c442..9ec683362b4 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -51,7 +51,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -63,7 +63,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -84,7 +84,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -92,7 +92,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
index a5b8dbcb50e..24fa9840cac 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -55,7 +55,7 @@ public class SpecialModelName {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -63,7 +63,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
index a70b698b127..f325cdbc7c7 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,7 +59,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 65eb6453233..2ed0abac63b 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -79,7 +79,7 @@ public class TypeHolderDefault {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -107,7 +107,7 @@ public class TypeHolderDefault {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -115,7 +115,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -134,7 +134,7 @@ public class TypeHolderDefault {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -142,7 +142,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -161,7 +161,7 @@ public class TypeHolderDefault {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -169,7 +169,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -196,7 +196,7 @@ public class TypeHolderDefault {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -204,7 +204,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index de657b960f2..faeec9617d3 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -84,7 +84,7 @@ public class TypeHolderExample {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -92,7 +92,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -112,7 +112,7 @@ public class TypeHolderExample {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -120,7 +120,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -139,7 +139,7 @@ public class TypeHolderExample {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -147,7 +147,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -166,7 +166,7 @@ public class TypeHolderExample {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -174,7 +174,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -193,7 +193,7 @@ public class TypeHolderExample {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean isBoolItem() {
@@ -201,7 +201,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -228,7 +228,7 @@ public class TypeHolderExample {
   @javax.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -236,7 +236,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
index dd08acc163c..69deb67371f 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/User.java
@@ -89,7 +89,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -97,7 +97,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -115,7 +115,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -123,7 +123,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -141,7 +141,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -149,7 +149,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -167,7 +167,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -175,7 +175,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -193,7 +193,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -201,7 +201,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -219,7 +219,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -227,7 +227,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -245,7 +245,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -253,7 +253,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -271,7 +271,7 @@ public class User {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -279,7 +279,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
index be49e02ce75..8ffdaefa00d 100644
--- a/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -198,7 +198,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -206,7 +206,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -225,7 +225,7 @@ public class XmlItem {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -233,7 +233,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -251,7 +251,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -259,7 +259,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -277,7 +277,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isAttributeBoolean() {
@@ -285,7 +285,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -311,7 +311,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -319,7 +319,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -337,7 +337,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -345,7 +345,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -364,7 +364,7 @@ public class XmlItem {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -372,7 +372,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -390,7 +390,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -398,7 +398,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -416,7 +416,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNameBoolean() {
@@ -424,7 +424,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -450,7 +450,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -458,7 +458,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -484,7 +484,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -492,7 +492,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -510,7 +510,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -518,7 +518,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -537,7 +537,7 @@ public class XmlItem {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -545,7 +545,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -563,7 +563,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -571,7 +571,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -589,7 +589,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixBoolean() {
@@ -597,7 +597,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -623,7 +623,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -631,7 +631,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -657,7 +657,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -665,7 +665,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -683,7 +683,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -691,7 +691,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -710,7 +710,7 @@ public class XmlItem {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -718,7 +718,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -736,7 +736,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -744,7 +744,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -762,7 +762,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isNamespaceBoolean() {
@@ -770,7 +770,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -796,7 +796,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -804,7 +804,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -830,7 +830,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -838,7 +838,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -856,7 +856,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -864,7 +864,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -883,7 +883,7 @@ public class XmlItem {
   @javax.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -891,7 +891,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -909,7 +909,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -917,7 +917,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -935,7 +935,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean isPrefixNsBoolean() {
@@ -943,7 +943,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -969,7 +969,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -977,7 +977,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1003,7 +1003,7 @@ public class XmlItem {
    */
   @javax.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1011,7 +1011,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java b/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
index 9d6609593e3..388eb30e036 100644
--- a/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
+++ b/samples/client/petstore/java/restclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
@@ -81,7 +81,7 @@ public class ByteArrayObject {
         return nullableArray.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<byte[]> getNullableArray_JsonNullable() {
@@ -108,7 +108,7 @@ public class ByteArrayObject {
    * @return normalArray
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public byte[] getNormalArray() {
@@ -116,7 +116,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNormalArray(@jakarta.annotation.Nullable byte[] normalArray) {
     this.normalArray = normalArray;
@@ -139,7 +139,7 @@ public class ByteArrayObject {
         return nullableString.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableString_JsonNullable() {
@@ -166,7 +166,7 @@ public class ByteArrayObject {
    * @return stringField
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getStringField() {
@@ -174,7 +174,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringField(@jakarta.annotation.Nullable String stringField) {
     this.stringField = stringField;
@@ -191,7 +191,7 @@ public class ByteArrayObject {
    * @return intField
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getIntField() {
@@ -199,7 +199,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntField(@jakarta.annotation.Nullable BigDecimal intField) {
     this.intField = intField;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 4a3c0df9cc2..35611aad246 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -75,7 +75,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -101,7 +101,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -109,7 +109,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 987d45cdef9..b7079539803 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -58,7 +58,7 @@ public class AllOfWithSingleRef {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -66,7 +66,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -84,7 +84,7 @@ public class AllOfWithSingleRef {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -92,7 +92,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
index 93e39160fc6..35fde59be1a 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
@@ -70,7 +70,7 @@ public class Animal {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -78,7 +78,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public class Animal {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index ed15d178056..d8c94a3ac5d 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public class ArrayOfArrayOfNumberOnly {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -72,7 +72,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f78b23397d0..b8bb29d1f8e 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public class ArrayOfNumberOnly {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -72,7 +72,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
index c216662a78c..155e3aa0128 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -74,7 +74,7 @@ public class ArrayTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -82,7 +82,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -108,7 +108,7 @@ public class ArrayTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -116,7 +116,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -142,7 +142,7 @@ public class ArrayTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -150,7 +150,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
index 590e1efc8a9..cf9427605b7 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,7 +103,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -111,7 +111,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -129,7 +129,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -137,7 +137,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -155,7 +155,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -163,7 +163,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -181,7 +181,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -189,7 +189,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -207,7 +207,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -215,7 +215,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
index 82b0f511d43..435d527b0c3 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
@@ -63,7 +63,7 @@ public class Cat extends Animal {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -71,7 +71,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 9c6887414dc..95dcc59fae1 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public class Category {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Category {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 66d30b4a691..58a5fcf0650 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -64,7 +64,7 @@ public class ChildWithNullable extends ParentWithNullable {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -72,7 +72,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
index 7164e1e739b..875de73f810 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public class ClassModel {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
index b99a99f6c26..fa4ba6916e8 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public class Client {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 0c960ab9e62..f5cab33258d 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -54,7 +54,7 @@ public class DeprecatedObject {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
index 223bb9b2c1e..8540c0be08c 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
@@ -63,7 +63,7 @@ public class Dog extends Animal {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -71,7 +71,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
index 9d3ac59d883..df5dd9e9913 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -130,7 +130,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -138,7 +138,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,7 +164,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -172,7 +172,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
index c7132426bab..fb4fee649d6 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -240,7 +240,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -248,7 +248,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -266,7 +266,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -274,7 +274,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -292,7 +292,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -300,7 +300,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -318,7 +318,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -326,7 +326,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -350,7 +350,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -378,7 +378,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -386,7 +386,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -404,7 +404,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -412,7 +412,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -430,7 +430,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -438,7 +438,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 2df80fd0505..ef0cf6beaa6 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -61,7 +61,7 @@ public class FakeBigDecimalMap200Response {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -69,7 +69,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -95,7 +95,7 @@ public class FakeBigDecimalMap200Response {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -103,7 +103,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 69b687cf7d0..3bfc296c43c 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -61,7 +61,7 @@ public class FileSchemaTestClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -69,7 +69,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -95,7 +95,7 @@ public class FileSchemaTestClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -103,7 +103,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
index a6d7ce8f061..8ac3e28621d 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
@@ -52,7 +52,7 @@ public class Foo {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -60,7 +60,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 65bc312d25e..568c2399628 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -54,7 +54,7 @@ public class FooGetDefaultResponse {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -62,7 +62,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
index 866f92c5bfe..809d94ed908 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -135,7 +135,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -143,7 +143,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -163,7 +163,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -171,7 +171,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -189,7 +189,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -197,7 +197,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -217,7 +217,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -225,7 +225,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -245,7 +245,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -253,7 +253,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -273,7 +273,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -281,7 +281,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -299,7 +299,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -307,7 +307,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -325,7 +325,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -333,7 +333,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -351,7 +351,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -359,7 +359,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -377,7 +377,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -385,7 +385,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -403,7 +403,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -411,7 +411,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -429,7 +429,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -437,7 +437,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -455,7 +455,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -463,7 +463,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -481,7 +481,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -489,7 +489,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -507,7 +507,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string that is a 10 digit number. Can have leading zeros.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -515,7 +515,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -533,7 +533,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string starting with 'image_' (case insensitive) and one to three digits following i.e. Image_01.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -541,7 +541,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index a711b2db349..4032a368d38 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -64,7 +64,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index d973f1e28e8..a1922245f93 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -63,7 +63,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
index 0e00948fe9e..755b0e57e97 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
@@ -112,7 +112,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -120,7 +120,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -146,7 +146,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -154,7 +154,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -180,7 +180,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -188,7 +188,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -214,7 +214,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -222,7 +222,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 2b7468968fe..d8ac1026378 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -75,7 +75,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -93,7 +93,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -101,7 +101,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -127,7 +127,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -135,7 +135,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
index 99c6461e8ba..5350c4dea46 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,7 +85,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -93,7 +93,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 0dc565ea855..2e42ca33ab0 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -115,7 +115,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -123,7 +123,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
index 033af31fba0..ac2f1b7299f 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public class ModelFile {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
index 7e8ea3af426..a3b6110a3cf 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public class ModelList {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
index 022c1740ea4..1c7cd7829fc 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public class ModelReturn {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
index 33badc53706..9d96f896507 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
@@ -80,7 +80,7 @@ public class Name {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -88,7 +88,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -100,7 +100,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -121,7 +121,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -129,7 +129,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -141,7 +141,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
index 9d88be7f65c..869717bf376 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -129,7 +129,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -163,7 +163,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -197,7 +197,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -231,7 +231,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -265,7 +265,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -299,7 +299,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -345,7 +345,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -391,7 +391,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -427,7 +427,7 @@ public class NullableClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -435,7 +435,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -471,7 +471,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -517,7 +517,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -553,7 +553,7 @@ public class NullableClass {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -561,7 +561,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
index cc97d20867e..fb49cf6e269 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -53,7 +53,7 @@ public class NumberOnly {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -61,7 +61,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 8a501950551..429af66115c 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -72,7 +72,7 @@ public class ObjectWithDeprecatedFields {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -80,7 +80,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -100,7 +100,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -108,7 +108,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -136,7 +136,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -164,7 +164,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -172,7 +172,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 7639563acc6..27041f31777 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,7 +167,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -175,7 +175,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -193,7 +193,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -201,7 +201,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -219,7 +219,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -227,7 +227,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -245,7 +245,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -253,7 +253,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
index 070329dfb1c..1d17721a2f7 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -63,7 +63,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -71,7 +71,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -89,7 +89,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -97,7 +97,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -115,7 +115,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -123,7 +123,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index c1fd0678f89..b7859c56a36 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -53,7 +53,7 @@ public class OuterObjectWithEnumProperty {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -61,7 +61,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 2744174881b..7bfadd2a4a1 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -106,7 +106,7 @@ public class ParentWithNullable {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -114,7 +114,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -138,7 +138,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 6bd43f4e116..82d638e7913 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -148,7 +148,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -156,7 +156,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -174,7 +174,7 @@ public class Pet {
    */
   @jakarta.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -182,7 +182,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -208,7 +208,7 @@ public class Pet {
    */
   @jakarta.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -217,7 +217,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -243,7 +243,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -251,7 +251,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -269,7 +269,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -277,7 +277,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 5dbd7a4a442..ee86a4e3de0 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -61,7 +61,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -90,7 +90,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 867287f1246..65fbc9c1a87 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public class SpecialModelName {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 7bac797ac28..4db0feda758 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 15b805f10cd..eaacaa06b13 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -57,7 +57,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -65,7 +65,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
index b9d82f4e952..375f75b3c46 100644
--- a/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -113,7 +113,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -121,7 +121,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -139,7 +139,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -147,7 +147,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -165,7 +165,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -173,7 +173,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -191,7 +191,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -199,7 +199,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -217,7 +217,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -225,7 +225,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -243,7 +243,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -251,7 +251,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -269,7 +269,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -277,7 +277,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a90c962979d..649ac5b808f 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index ed656c05115..a4c5dc44024 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Animal.java
index 5d953f42729..a6079a052a2 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index a151adc7cec..3f68c19abe6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 4fc87ba03b5..83a78a64459 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayTest.java
index 9b59d439f18..bdd1cbc6aa7 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Capitalization.java
index e25fddbdc25..5fffe092927 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Cat.java
index d90e7608a7f..623afc5cd55 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Category.java
index a40eb2dde2e..b42bb6a1245 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a1ab3b1e678..ed50d7e7f7d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ClassModel.java
index 1bfbadd89a5..27ecd55725e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Client.java
index 34cee327d68..c04a3457e5c 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index efd8cae5654..8d483ec3e8a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Dog.java
index c7826d226a5..1d04776ca4d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumArrays.java
index 463d95df3c0..2006c0857f9 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumTest.java
index 988251aa876..03597917fa3 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 239661740b1..29c8e25c008 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 5668a7aea47..40c3c6e52ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Foo.java
index 827cbd6bdfe..6bbeb3b5ebd 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 14364cf9373..a7b34141a2e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FormatTest.java
index 106d38f692c..9b861c8a1a4 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 98cd4322dfe..2a4c04441ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8d9de7e7475..9c0ac6478fe 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MapTest.java
index 8610793925e..fbb0c2a250a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 3b3b53bd6f4..633c1a3f7ec 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Model200Response.java
index d0f8853555e..4259b8d2d6f 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index bf4359eeee1..093fca7f680 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelFile.java
index f7f930b5f81..11ec90d12c8 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelList.java
index 70d61225642..6b2b536f034 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelReturn.java
index b44e351a32f..97d20efa034 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Name.java
index 1ba9f4b9efb..572c8c455ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NullableClass.java
index e7b2b966bda..0e1b52a8814 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NumberOnly.java
index ecd1681390e..e842bfd7f75 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 4a49fa52b38..4c78d29d6c6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Order.java
index 87736bbf7c4..581de823139 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterComposite.java
index 6c8f9c1cf22..246cc9e3329 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 9e882650ff8..ee662372ad0 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b77f962e34c..c7397c9497b 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Pet.java
index 972cf1acaa1..a20cf1b0f14 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 8d99f52aca9..49cbb8b0e0c 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 469b9950257..0ab26e1be2b 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Tag.java
index 837a1aa18ff..c72669d2257 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 296b99cb24f..c7e901faf9e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/User.java
index 0d670d5492a..6005ea81bee 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a90c962979d..649ac5b808f 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index ed656c05115..a4c5dc44024 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
index 5d953f42729..a6079a052a2 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index a151adc7cec..3f68c19abe6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 4fc87ba03b5..83a78a64459 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
index 9b59d439f18..bdd1cbc6aa7 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
index e25fddbdc25..5fffe092927 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
index d90e7608a7f..623afc5cd55 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
index a40eb2dde2e..b42bb6a1245 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a1ab3b1e678..ed50d7e7f7d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
index 1bfbadd89a5..27ecd55725e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
index 34cee327d68..c04a3457e5c 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index efd8cae5654..8d483ec3e8a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
index c7826d226a5..1d04776ca4d 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
index 463d95df3c0..2006c0857f9 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
index 988251aa876..03597917fa3 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 239661740b1..29c8e25c008 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 5668a7aea47..40c3c6e52ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
index 827cbd6bdfe..6bbeb3b5ebd 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 14364cf9373..a7b34141a2e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
index 106d38f692c..9b861c8a1a4 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 98cd4322dfe..2a4c04441ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8d9de7e7475..9c0ac6478fe 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
index 8610793925e..fbb0c2a250a 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 3b3b53bd6f4..633c1a3f7ec 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
index d0f8853555e..4259b8d2d6f 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index bf4359eeee1..093fca7f680 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
index f7f930b5f81..11ec90d12c8 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
index 70d61225642..6b2b536f034 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
index b44e351a32f..97d20efa034 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
index 1ba9f4b9efb..572c8c455ff 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
index e7b2b966bda..0e1b52a8814 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
index ecd1681390e..e842bfd7f75 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 4a49fa52b38..4c78d29d6c6 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
index 87736bbf7c4..581de823139 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
index 6c8f9c1cf22..246cc9e3329 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 9e882650ff8..ee662372ad0 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b77f962e34c..c7397c9497b 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
index 972cf1acaa1..a20cf1b0f14 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 8d99f52aca9..49cbb8b0e0c 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 469b9950257..0ab26e1be2b 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
index 837a1aa18ff..c72669d2257 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 296b99cb24f..c7e901faf9e 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
index 0d670d5492a..6005ea81bee 100644
--- a/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index b55059fa8f4..17614a28c7d 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index ed656c05115..a4c5dc44024 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
index 5d953f42729..a6079a052a2 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index bc98eb4dde5..986d5b27a7e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 7b151f20ef7..571f8e912e4 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index b312f72e3d7..e84ca27edf1 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
index e25fddbdc25..5fffe092927 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
index d90e7608a7f..623afc5cd55 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
index a40eb2dde2e..b42bb6a1245 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a1ab3b1e678..ed50d7e7f7d 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
index 1bfbadd89a5..27ecd55725e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
index 34cee327d68..c04a3457e5c 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index efd8cae5654..8d483ec3e8a 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
index c7826d226a5..1d04776ca4d 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index b911699943d..d2b8dde5bd4 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
index 988251aa876..03597917fa3 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index a8900a26242..5140ec820b4 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index b9b2448aec8..16ddf3085f0 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
index 827cbd6bdfe..6bbeb3b5ebd 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 14364cf9373..a7b34141a2e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 106d38f692c..9b861c8a1a4 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 98cd4322dfe..2a4c04441ff 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8d9de7e7475..9c0ac6478fe 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
index 24f3feea215..f0404f6aebb 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 035ec9b37fb..fcfa5d4791e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
index d0f8853555e..4259b8d2d6f 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index bf4359eeee1..093fca7f680 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
index f7f930b5f81..11ec90d12c8 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
index 70d61225642..6b2b536f034 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index b44e351a32f..97d20efa034 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
index 1ba9f4b9efb..572c8c455ff 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
index 123492aa5ec..5efdf61197b 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index ecd1681390e..e842bfd7f75 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 6ee674ed1c0..6dcda1d97fb 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
index 87736bbf7c4..581de823139 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index 6c8f9c1cf22..246cc9e3329 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 9e882650ff8..ee662372ad0 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b77f962e34c..c7397c9497b 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
index 7bac1a76dd2..7b4848eafea 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 8d99f52aca9..49cbb8b0e0c 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 469b9950257..0ab26e1be2b 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
index 837a1aa18ff..c72669d2257 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 296b99cb24f..c7e901faf9e 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
index 0d670d5492a..6005ea81bee 100644
--- a/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index f99361d4d0a..0536c33fe90 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 26d46cb0ac9..6d8944fce3d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
index 5ef4c91df20..19755da7cd8 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6ce9b83c67e..c2d684e2fcf 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f36135202ce..28fbf8c2d5b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2453f58cc35..e0175f2d03d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
index 5682f213b65..e4864216208 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
index 33872f36026..be8e7fd55e9 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
index 78cc077529b..249f14c58a6 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index ec7b8f7e313..f0910711118 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
index 74dd4385a90..bc883861da5 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
index 99fe381a876..76b0c5cac91 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 667be6e27ff..d06066490e9 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
index 9c932cb01bd..63cc53e6602 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
index e6cca680c1f..95af14f9eb1 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
index fd1ad1a42dc..905dfb17455 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,14 +344,14 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 16f1b68bbcd..4e6af414357 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a05efa3c913..28eae4a9c51 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
index c85972a7b23..9da778b7804 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1f2159ab4ec..48668506357 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
index 8e9b9fbbf77..6600f7b20e5 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index ef912674bde..dd34438d5ed 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index e7acb5847d1..6c68cba6f3c 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,14 +60,14 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
index ec9e81743d7..99c72041af4 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b480c7d542d..d0219f2e217 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
index 2a69b55cfd6..7a268eb4a14 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f080773624a..1255ae56e3d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
index 21f812364f0..45f97655028 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
index c24868360f6..dfef26ef7fb 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
index b7ca4af717d..6901c048a0a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
index dce25ead211..4c67288873e 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Name.java
@@ -58,8 +58,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
index 62877f172a8..4d9dc0c5370 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -124,14 +124,14 @@ public class NullableClass extends HashMap<String, Object> {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -157,14 +157,14 @@ public class NullableClass extends HashMap<String, Object> {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -190,14 +190,14 @@ public class NullableClass extends HashMap<String, Object> {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -223,14 +223,14 @@ public class NullableClass extends HashMap<String, Object> {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -256,14 +256,14 @@ public class NullableClass extends HashMap<String, Object> {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -289,14 +289,14 @@ public class NullableClass extends HashMap<String, Object> {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -334,14 +334,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -379,14 +379,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -414,7 +414,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -422,7 +422,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -457,14 +457,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -502,14 +502,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -537,7 +537,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -545,7 +545,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
index a91f0c49358..c0748fb6a1c 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 82e32c8a38c..a7865e2253d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
index 64b26edbd41..54308806a1d 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3ba67944ba1..d4122b6599f 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 4dd4534e941..db2c78fc32b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b59dbe0c734..d85b036b919 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,14 +135,14 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
index 2a0fdfd8c10..91c27389915 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d1147f1fda3..eee83de7ead 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1e8cf30bc34..9ac2edeb246 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
index c46a759548f..666772aed4b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 59a40a36e96..9e49fc2ab4b 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
index 006f4222a31..f342e9bcd3a 100644
--- a/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
index 214d8d91f31..231c5488552 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -63,7 +63,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -71,7 +71,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index fe0515e359f..92c12ad234a 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -70,7 +70,7 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -78,7 +78,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -95,7 +95,7 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -103,7 +103,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -120,7 +120,7 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -128,7 +128,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
index 81a29e6a185..0ffa995a40f 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -125,7 +125,7 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -133,7 +133,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -150,7 +150,7 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -158,7 +158,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -175,7 +175,7 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -183,7 +183,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -200,7 +200,7 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -208,7 +208,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -225,7 +225,7 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -233,7 +233,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -250,7 +250,7 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -258,7 +258,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index 586c9f9cae0..02aa54f3fc2 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -129,7 +129,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -137,7 +137,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -154,7 +154,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -162,7 +162,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -179,7 +179,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -187,7 +187,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -212,7 +212,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -220,7 +220,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -245,7 +245,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -253,7 +253,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -272,7 +272,7 @@ public class Pet {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -280,7 +280,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index fa550c2067c..96b0a0009de 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -63,7 +63,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -71,7 +71,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
index a5a4d07fe26..af4064f71fa 100644
--- a/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -99,7 +99,7 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -107,7 +107,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -132,7 +132,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -149,7 +149,7 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -157,7 +157,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -174,7 +174,7 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -182,7 +182,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -199,7 +199,7 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -207,7 +207,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -224,7 +224,7 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -232,7 +232,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -249,7 +249,7 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -257,7 +257,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -274,7 +274,7 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -282,7 +282,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
index 1a895c2d58d..e42959cb552 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Category.java
@@ -59,7 +59,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 3ff45f50e07..ad2e6130c31 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,7 +65,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -73,7 +73,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -91,7 +91,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -99,7 +99,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -117,7 +117,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -125,7 +125,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
index b7c6e372af6..982f4de1528 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Order.java
@@ -117,7 +117,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -143,7 +143,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -151,7 +151,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -169,7 +169,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -177,7 +177,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -195,7 +195,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -203,7 +203,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -221,7 +221,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -229,7 +229,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -247,7 +247,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -255,7 +255,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
index e5ada803fbf..21e8f948d45 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Pet.java
@@ -121,7 +121,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -129,7 +129,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -147,7 +147,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -155,7 +155,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -173,7 +173,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -181,7 +181,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -207,7 +207,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -215,7 +215,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -241,7 +241,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -249,7 +249,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -269,7 +269,7 @@ public class Pet {
   @Deprecated
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -277,7 +277,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
index 5398b4a2d48..405115f26c1 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,7 +59,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
index fa72657936b..29e7677d26d 100644
--- a/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-swagger1/src/main/java/org/openapitools/client/model/User.java
@@ -89,7 +89,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -97,7 +97,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -115,7 +115,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -123,7 +123,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -141,7 +141,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -149,7 +149,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -167,7 +167,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -175,7 +175,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -193,7 +193,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -201,7 +201,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -219,7 +219,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -227,7 +227,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -245,7 +245,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -253,7 +253,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -271,7 +271,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -279,7 +279,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 3a6ba4ddb5d..d0f875abf8f 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index e65661314e3..af309bd6a51 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,7 +90,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -98,7 +98,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -116,7 +116,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -124,7 +124,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 2852ae16616..70b7168f461 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -150,7 +150,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -168,7 +168,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -176,7 +176,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -194,7 +194,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -202,7 +202,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -220,7 +220,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -228,7 +228,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -246,7 +246,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -254,7 +254,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index f45892a3e7f..f5eb8f68bfe 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -146,7 +146,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -154,7 +154,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -172,7 +172,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -180,7 +180,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -206,7 +206,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -214,7 +214,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -240,7 +240,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -248,7 +248,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -268,7 +268,7 @@ public class Pet {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -276,7 +276,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 73527453e8d..14a9b877d7a 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
index 6ccd07bfeff..8a5e8862aee 100644
--- a/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -96,7 +96,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -114,7 +114,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -122,7 +122,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -140,7 +140,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -148,7 +148,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -166,7 +166,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -174,7 +174,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -192,7 +192,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -200,7 +200,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -218,7 +218,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -226,7 +226,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -244,7 +244,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -252,7 +252,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -270,7 +270,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -278,7 +278,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index caa4d48bdd0..d2c7fdb73b3 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -74,7 +74,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -84,7 +84,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -111,7 +111,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -121,7 +121,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_map_property")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 7298a5ca86a..6429eb8d843 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -65,7 +65,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
 
@@ -74,7 +74,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(@javax.annotation.Nullable String username) {
@@ -92,7 +92,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SingleRefType")
 
@@ -101,7 +101,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SingleRefType")
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
index e80e9e41f80..b7f541cdbd5 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Animal.java
@@ -77,7 +77,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "className")
 
@@ -86,7 +86,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "className")
   public void setClassName(@javax.annotation.Nonnull String className) {
@@ -104,7 +104,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "color")
 
@@ -113,7 +113,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "color")
   public void setColor(@javax.annotation.Nullable String color) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 566e5e5ad1d..a5cc1b51ce5 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -80,7 +80,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 73f9591aca7..fd4ee602d82 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -80,7 +80,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ArrayNumber")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
index 19c9fc50ec8..5d6fd73b1d6 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -82,7 +82,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -92,7 +92,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -119,7 +119,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_integer")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -129,7 +129,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_integer")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -156,7 +156,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_model")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -166,7 +166,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_array_of_model")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
index 9f9e874c577..b8ce6ca783e 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -88,7 +88,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "smallCamel")
 
@@ -97,7 +97,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "smallCamel")
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
@@ -115,7 +115,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "CapitalCamel")
 
@@ -124,7 +124,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "CapitalCamel")
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
@@ -142,7 +142,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "small_Snake")
 
@@ -151,7 +151,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "small_Snake")
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
@@ -169,7 +169,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Capital_Snake")
 
@@ -178,7 +178,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Capital_Snake")
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
@@ -196,7 +196,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SCA_ETH_Flow_Points")
 
@@ -205,7 +205,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "SCA_ETH_Flow_Points")
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
@@ -223,7 +223,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ATT_NAME")
 
@@ -232,7 +232,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "ATT_NAME")
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
index c4648ec9b77..b804f222590 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Cat.java
@@ -69,7 +69,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "declawed")
 
@@ -78,7 +78,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "declawed")
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
index 876c2719878..b17b2cb8315 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Category.java
@@ -64,7 +64,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -73,7 +73,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -91,7 +91,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -100,7 +100,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 548133322e4..17d8d0e8cf5 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "otherProperty")
 
@@ -79,7 +79,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "otherProperty")
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
index 8ec6a565377..67166cdd679 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -58,7 +58,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "_class")
 
@@ -67,7 +67,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "_class")
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
index 19e8756795e..30d53cd9aaf 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Client.java
@@ -58,7 +58,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "client")
 
@@ -67,7 +67,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "client")
   public void setClient(@javax.annotation.Nullable String client) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index db183cbc787..8b06e3c26bf 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -60,7 +60,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -69,7 +69,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
index 9aba5d8f8c6..11e6b8eaf7b 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Dog.java
@@ -69,7 +69,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "breed")
 
@@ -78,7 +78,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "breed")
   public void setBreed(@javax.annotation.Nullable String breed) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
index 7b4e7102dad..323e452f696 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -145,7 +145,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "just_symbol")
 
@@ -154,7 +154,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "just_symbol")
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
@@ -180,7 +180,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_enum")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -190,7 +190,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_enum")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
index f507eada5a4..af1c738197b 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -271,7 +271,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_string")
 
@@ -280,7 +280,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_string")
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
@@ -298,7 +298,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "enum_string_required")
 
@@ -307,7 +307,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "enum_string_required")
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
@@ -325,7 +325,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_integer")
 
@@ -334,7 +334,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_integer")
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
@@ -352,7 +352,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_number")
 
@@ -361,7 +361,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "enum_number")
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
@@ -385,7 +385,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnum")
 
@@ -413,7 +413,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumInteger")
 
@@ -422,7 +422,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumInteger")
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
@@ -440,7 +440,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumDefaultValue")
 
@@ -449,7 +449,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumDefaultValue")
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
@@ -467,7 +467,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumIntegerDefaultValue")
 
@@ -476,7 +476,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "outerEnumIntegerDefaultValue")
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 1a02e667f8c..c3cb7e5c430 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -68,7 +68,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someId")
 
@@ -77,7 +77,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someId")
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
@@ -103,7 +103,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someMap")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -113,7 +113,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someMap")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 017cf687799..7ebc16f6e1f 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -68,7 +68,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "file")
 
@@ -77,7 +77,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "file")
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
@@ -103,7 +103,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "files")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -113,7 +113,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "files")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
index 695077a322c..7b6984f8916 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Foo.java
@@ -58,7 +58,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -67,7 +67,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
   public void setBar(@javax.annotation.Nullable String bar) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 823c4169207..ec866529202 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
 
@@ -69,7 +69,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
   public void setString(@javax.annotation.Nullable Foo string) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
index cccb2099043..91f2914f798 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -157,7 +157,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer")
 
@@ -166,7 +166,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer")
   public void setInteger(@javax.annotation.Nullable Integer integer) {
@@ -186,7 +186,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int32")
 
@@ -195,7 +195,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int32")
   public void setInt32(@javax.annotation.Nullable Integer int32) {
@@ -213,7 +213,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int64")
 
@@ -222,7 +222,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "int64")
   public void setInt64(@javax.annotation.Nullable Long int64) {
@@ -242,7 +242,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "number")
 
@@ -251,7 +251,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "number")
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
@@ -271,7 +271,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "float")
 
@@ -280,7 +280,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "float")
   public void setFloat(@javax.annotation.Nullable Float _float) {
@@ -300,7 +300,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "double")
 
@@ -309,7 +309,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "double")
   public void setDouble(@javax.annotation.Nullable Double _double) {
@@ -327,7 +327,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "decimal")
 
@@ -336,7 +336,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "decimal")
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
@@ -354,7 +354,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
 
@@ -363,7 +363,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string")
   public void setString(@javax.annotation.Nullable String string) {
@@ -381,7 +381,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "byte")
 
@@ -390,7 +390,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "byte")
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
@@ -408,7 +408,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "binary")
 
@@ -417,7 +417,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "binary")
   public void setBinary(@javax.annotation.Nullable File binary) {
@@ -435,7 +435,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "date")
 
@@ -444,7 +444,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "date")
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
@@ -462,7 +462,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
 
@@ -471,7 +471,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
@@ -489,7 +489,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -498,7 +498,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "password")
 
@@ -525,7 +525,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(@javax.annotation.Nonnull String password) {
@@ -543,7 +543,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits")
 
@@ -552,7 +552,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits")
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
@@ -570,7 +570,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits_and_delimiter")
 
@@ -579,7 +579,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "pattern_with_digits_and_delimiter")
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 356d9ced734..94bcd64a272 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -59,7 +59,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -74,7 +74,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "foo")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 45d398acb4c..8202c636cf9 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -68,7 +68,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "NullableMessage")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
index 4b85a029f25..21efbcd45b9 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MapTest.java
@@ -125,7 +125,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_map_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -135,7 +135,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_map_of_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -162,7 +162,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_enum_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -172,7 +172,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map_of_enum_string")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -199,7 +199,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "direct_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -209,7 +209,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "direct_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -236,7 +236,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "indirect_map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -246,7 +246,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "indirect_map")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index c7ce62ce3e3..eeb676a6573 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -76,7 +76,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -85,7 +85,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
@@ -103,7 +103,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
 
@@ -112,7 +112,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "dateTime")
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
@@ -138,7 +138,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -148,7 +148,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "map")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
index 1db13de8167..2431302a770 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -65,7 +65,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -74,7 +74,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable Integer name) {
@@ -92,7 +92,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "class")
 
@@ -101,7 +101,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "class")
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 8e3ccf6e3b7..3cf357dac0a 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -71,7 +71,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
 
@@ -80,7 +80,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "code")
   public void setCode(@javax.annotation.Nullable Integer code) {
@@ -98,7 +98,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
 
@@ -107,7 +107,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(@javax.annotation.Nullable String type) {
@@ -125,7 +125,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
 
@@ -134,7 +134,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "message")
   public void setMessage(@javax.annotation.Nullable String message) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
index 738297724cd..b772364365a 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -59,7 +59,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "sourceURI")
 
@@ -68,7 +68,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "sourceURI")
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
index 2b3b23033dc..fb2d2dec4d0 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelList.java
@@ -59,7 +59,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123-list")
 
@@ -68,7 +68,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123-list")
   public void set123list(@javax.annotation.Nullable String _123list) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
index 7fecc905dec..c17fd98594c 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -59,7 +59,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "return")
 
@@ -68,7 +68,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "return")
   public void setReturn(@javax.annotation.Nullable Integer _return) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
index b6f381ace7a..b3cd356abdf 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Name.java
@@ -76,7 +76,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull Integer name) {
@@ -97,7 +97,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "snake_case")
 
@@ -118,7 +118,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "property")
 
@@ -127,7 +127,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "property")
   public void setProperty(@javax.annotation.Nullable String property) {
@@ -139,7 +139,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "123Number")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
index 706363e64b2..d0aba5bda81 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -147,7 +147,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "integer_prop")
 
@@ -181,7 +181,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "number_prop")
 
@@ -215,7 +215,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "boolean_prop")
 
@@ -249,7 +249,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "string_prop")
 
@@ -283,7 +283,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "date_prop")
 
@@ -317,7 +317,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "datetime_prop")
 
@@ -363,7 +363,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -410,7 +410,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_and_items_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -447,7 +447,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -457,7 +457,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "array_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -494,7 +494,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -541,7 +541,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_and_items_nullable_prop")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -578,7 +578,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -588,7 +588,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "object_items_nullable")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
index 527a1ca7413..d7bf16e535a 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -59,7 +59,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "JustNumber")
 
@@ -68,7 +68,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "JustNumber")
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index b01e30fa38f..6bf754fa77e 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -81,7 +81,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
 
@@ -90,7 +90,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "uuid")
   public void setUuid(@javax.annotation.Nullable String uuid) {
@@ -110,7 +110,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -119,7 +119,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable BigDecimal id) {
@@ -139,7 +139,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "deprecatedRef")
 
@@ -148,7 +148,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "deprecatedRef")
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
@@ -176,7 +176,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bars")
   @JacksonXmlElementWrapper(useWrapping = false)
@@ -186,7 +186,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bars")
   @JacksonXmlElementWrapper(useWrapping = false)
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
index 1cf25c4f9de..073e0e91907 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Order.java
@@ -132,7 +132,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -141,7 +141,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -159,7 +159,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
 
@@ -168,7 +168,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "petId")
   public void setPetId(@javax.annotation.Nullable Long petId) {
@@ -186,7 +186,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
 
@@ -195,7 +195,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "quantity")
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
@@ -213,7 +213,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
 
@@ -222,7 +222,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "shipDate")
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
@@ -240,7 +240,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
 
@@ -249,7 +249,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
@@ -267,7 +267,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
 
@@ -276,7 +276,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "complete")
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
index b4884ae3e64..32bf089a38d 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -71,7 +71,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_number")
 
@@ -80,7 +80,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_number")
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
@@ -98,7 +98,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_string")
 
@@ -107,7 +107,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_string")
   public void setMyString(@javax.annotation.Nullable String myString) {
@@ -125,7 +125,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_boolean")
 
@@ -134,7 +134,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "my_boolean")
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index a643010396f..c71b108d1dd 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "value")
 
@@ -68,7 +68,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "value")
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 6e4652a2d67..4864de7df6c 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -116,7 +116,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
 
@@ -125,7 +125,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "type")
   public void setType(@javax.annotation.Nullable TypeEnum type) {
@@ -149,7 +149,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "nullableProperty")
 
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
index 87dd7365c31..866164d052a 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java
@@ -140,7 +140,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -149,7 +149,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -167,7 +167,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
 
@@ -176,7 +176,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Category")
   public void setCategory(@javax.annotation.Nullable Category category) {
@@ -194,7 +194,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
 
@@ -203,7 +203,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nonnull String name) {
@@ -229,7 +229,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
@@ -240,7 +240,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   @JacksonXmlProperty(localName = "photoUrl")
   @JacksonXmlElementWrapper(localName = "photoUrls", useWrapping = true)
@@ -267,7 +267,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -277,7 +277,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "Tag")
   @JacksonXmlElementWrapper(localName = "tag", useWrapping = true)
@@ -296,7 +296,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
 
@@ -305,7 +305,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "status")
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index b51616d7f09..f4d96bdc297 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -58,7 +58,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "bar")
 
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "baz")
 
@@ -88,7 +88,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "baz")
   public void setBaz(@javax.annotation.Nullable String baz) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 904045082b8..50634d79ce2 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -59,7 +59,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "$special[property.name]")
 
@@ -68,7 +68,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "$special[property.name]")
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
index 2a691f47fdf..d780965da81 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Tag.java
@@ -64,7 +64,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -73,7 +73,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -91,7 +91,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
 
@@ -100,7 +100,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "name")
   public void setName(@javax.annotation.Nullable String name) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 8a5ce1ea5d8..d91115d40a1 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someProperty")
 
@@ -72,7 +72,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "someProperty")
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
index 2c359c41418..248a9445692 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/User.java
@@ -100,7 +100,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
 
@@ -109,7 +109,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "id")
   public void setId(@javax.annotation.Nullable Long id) {
@@ -127,7 +127,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
 
@@ -136,7 +136,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "username")
   public void setUsername(@javax.annotation.Nullable String username) {
@@ -154,7 +154,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
 
@@ -163,7 +163,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "firstName")
   public void setFirstName(@javax.annotation.Nullable String firstName) {
@@ -181,7 +181,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
 
@@ -190,7 +190,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "lastName")
   public void setLastName(@javax.annotation.Nullable String lastName) {
@@ -208,7 +208,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
 
@@ -217,7 +217,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "email")
   public void setEmail(@javax.annotation.Nullable String email) {
@@ -235,7 +235,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
 
@@ -244,7 +244,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "password")
   public void setPassword(@javax.annotation.Nullable String password) {
@@ -262,7 +262,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
 
@@ -271,7 +271,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "phone")
   public void setPhone(@javax.annotation.Nullable String phone) {
@@ -289,7 +289,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
 
@@ -298,7 +298,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   @JacksonXmlProperty(localName = "userStatus")
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index bcba8b7fe96..aaa6435254e 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -81,7 +81,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -114,7 +114,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 797c9901881..e113d5a6dfc 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -72,7 +72,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -97,7 +97,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
index 7a86da2b530..6ad5d759dd2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Animal.java
@@ -76,7 +76,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -84,7 +84,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -101,7 +101,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -109,7 +109,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index ecdb178d05e..c053828df8e 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -77,7 +77,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 873a753564e..a70067a9ded 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -69,7 +69,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -77,7 +77,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
index b24514f6148..0650850ffc2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -81,7 +81,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -89,7 +89,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -114,7 +114,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -122,7 +122,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -147,7 +147,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -155,7 +155,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
index 1ef86784b6b..f58f9317440 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -87,7 +87,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -95,7 +95,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -112,7 +112,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -120,7 +120,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -137,7 +137,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -145,7 +145,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -162,7 +162,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -170,7 +170,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -187,7 +187,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -195,7 +195,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -212,7 +212,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -220,7 +220,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
index 38fe848776b..f6d91178f23 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Cat.java
@@ -69,7 +69,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -77,7 +77,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
index 847f70f4d84..b79edf0e2d3 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Category.java
@@ -63,7 +63,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -71,7 +71,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 45885b81148..7106c5e3d4e 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -78,7 +78,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
index 3b1aacae82f..9551155194b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -57,7 +57,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -65,7 +65,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
index 9978bc018d9..c66ce2647d3 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Client.java
@@ -57,7 +57,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -65,7 +65,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 85483454435..d5d655a0232 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -59,7 +59,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -67,7 +67,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
index ad493d820d0..2d9681597cb 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Dog.java
@@ -69,7 +69,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -77,7 +77,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
index e20cb742cef..0c936fbfc5b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -136,7 +136,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -144,7 +144,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -169,7 +169,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -177,7 +177,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
index 41db7c8e9f9..0b1ab084775 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -252,7 +252,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -260,7 +260,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -277,7 +277,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -285,7 +285,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -302,7 +302,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -310,7 +310,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -327,7 +327,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -335,7 +335,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -358,7 +358,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -385,7 +385,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -393,7 +393,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -410,7 +410,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -418,7 +418,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -435,7 +435,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -443,7 +443,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index efd89324e21..6c21c83172a 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -75,7 +75,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -108,7 +108,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index fb71c3cd180..2f53e072edf 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -75,7 +75,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -108,7 +108,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
index bd14dfea3f6..604a90207e2 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Foo.java
@@ -57,7 +57,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -65,7 +65,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1d997843085..599939dd1fa 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -59,7 +59,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -67,7 +67,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
index bd083c20fc3..4650ad75827 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -155,7 +155,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -163,7 +163,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -182,7 +182,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -190,7 +190,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -207,7 +207,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -215,7 +215,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -234,7 +234,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -242,7 +242,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -261,7 +261,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -269,7 +269,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -288,7 +288,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -296,7 +296,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -313,7 +313,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -321,7 +321,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -338,7 +338,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -346,7 +346,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -363,7 +363,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -371,7 +371,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -388,7 +388,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -396,7 +396,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -413,7 +413,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -421,7 +421,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -438,7 +438,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -446,7 +446,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -463,7 +463,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -471,7 +471,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -488,7 +488,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -496,7 +496,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -513,7 +513,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -521,7 +521,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -538,7 +538,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -546,7 +546,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 540e7bf4ca7..fd998c31d8d 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index ef874cfe637..481a66b9e36 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -67,7 +67,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
index ff9a014c8c6..b141c06eb3a 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MapTest.java
@@ -120,7 +120,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -128,7 +128,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -153,7 +153,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -161,7 +161,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -186,7 +186,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -194,7 +194,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -219,7 +219,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -227,7 +227,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index ad1dacc935d..05828f94fdf 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -74,7 +74,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -82,7 +82,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -99,7 +99,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -107,7 +107,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -132,7 +132,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -140,7 +140,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
index a643c04784b..23a636c3840 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -64,7 +64,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -72,7 +72,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -89,7 +89,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -97,7 +97,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index a4413f60c9d..89a20d8ed27 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -70,7 +70,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -78,7 +78,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -95,7 +95,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -103,7 +103,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -120,7 +120,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -128,7 +128,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
index 02aaddaeba9..ecf45673662 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -58,7 +58,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -66,7 +66,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
index f0754681cd5..55636e54f0b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelList.java
@@ -58,7 +58,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -66,7 +66,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
index ba6d459617d..78c725682a4 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -58,7 +58,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -66,7 +66,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
index 793d8d9e73b..18216921b1a 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Name.java
@@ -87,7 +87,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -95,7 +95,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -106,7 +106,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -126,7 +126,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -134,7 +134,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -145,7 +145,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
index 46579c1237b..cfebe28d4cf 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -145,7 +145,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -178,7 +178,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -211,7 +211,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -244,7 +244,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -277,7 +277,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -310,7 +310,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -355,7 +355,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -400,7 +400,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -435,7 +435,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -443,7 +443,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -478,7 +478,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -523,7 +523,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -558,7 +558,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -566,7 +566,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
index 91babf5b7c5..1b801cb389b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -58,7 +58,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -66,7 +66,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 8a4c3e4583c..01ae38bcd40 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -80,7 +80,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -88,7 +88,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -107,7 +107,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -115,7 +115,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -134,7 +134,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -142,7 +142,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -169,7 +169,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -177,7 +177,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
index 0a3325c71ff..cc9e15db826 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Order.java
@@ -125,7 +125,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -133,7 +133,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -150,7 +150,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -158,7 +158,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -175,7 +175,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -183,7 +183,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -200,7 +200,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -208,7 +208,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -225,7 +225,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -233,7 +233,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -250,7 +250,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -258,7 +258,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
index b8a0b1c43d1..85c8e0d74a7 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -70,7 +70,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -78,7 +78,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -95,7 +95,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -103,7 +103,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -120,7 +120,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -128,7 +128,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index ee090938c86..09c767d8f30 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -58,7 +58,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -66,7 +66,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 217f93a421c..8eac0383a47 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -112,7 +112,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -120,7 +120,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -143,7 +143,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
index d3807c7ef9c..d6ddbc55183 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java
@@ -132,7 +132,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -140,7 +140,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -157,7 +157,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -165,7 +165,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -182,7 +182,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -190,7 +190,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -215,7 +215,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -224,7 +224,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -249,7 +249,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -257,7 +257,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -274,7 +274,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -282,7 +282,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index bb6e501c6c3..3f642c4a46b 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -67,7 +67,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -95,7 +95,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
index db2f94127fb..1bf3cab721c 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -58,7 +58,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -66,7 +66,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
index 1cef09eee0a..9e8b9c24dab 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Tag.java
@@ -63,7 +63,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -71,7 +71,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -88,7 +88,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -96,7 +96,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index b304ad0ee3d..22bff35a89e 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -62,7 +62,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -70,7 +70,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
index 59245d028f3..4642f1b230d 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/User.java
@@ -99,7 +99,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -107,7 +107,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -132,7 +132,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -149,7 +149,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -157,7 +157,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -174,7 +174,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -182,7 +182,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -199,7 +199,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -207,7 +207,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -224,7 +224,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -232,7 +232,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -249,7 +249,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -257,7 +257,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -274,7 +274,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -282,7 +282,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 4ccce4284ce..019a2c3ddd9 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index e4069be39c4..9a601ab1f90 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 79631d3a4b0..377b31d82fa 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 7ca892fb3cf..0961b8a73d3 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -115,7 +115,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -123,7 +123,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@jakarta.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -150,7 +150,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -158,7 +158,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@jakarta.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -184,7 +184,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -192,7 +192,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@jakarta.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -218,7 +218,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -226,7 +226,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@jakarta.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -253,7 +253,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -261,7 +261,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@jakarta.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -288,7 +288,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -296,7 +296,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@jakarta.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -323,7 +323,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -331,7 +331,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -358,7 +358,7 @@ public class AdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -366,7 +366,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@jakarta.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -384,7 +384,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -392,7 +392,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@jakarta.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -410,7 +410,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -418,7 +418,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@jakarta.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -436,7 +436,7 @@ public class AdditionalPropertiesClass {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -444,7 +444,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@jakarta.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index 4cc12b74234..dbfe7c12846 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index c04dadb8cdd..646a4e1dfe6 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -57,7 +57,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -65,7 +65,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index f2d8a6767e8..a050fb3d5bb 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index 3775365f8dd..546ff89e17e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -56,7 +56,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
index 9070112bdad..ad45485eba5 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java
@@ -73,7 +73,7 @@ public class Animal {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -81,7 +81,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -99,7 +99,7 @@ public class Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -107,7 +107,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 55c6ff38a29..d3d30eae598 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -66,7 +66,7 @@ public class ArrayOfArrayOfNumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -74,7 +74,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index ebb18fdd0b0..35720379617 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -66,7 +66,7 @@ public class ArrayOfNumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -74,7 +74,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2c9710c2bd7..fc2d80d40be 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -75,7 +75,7 @@ public class ArrayTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -83,7 +83,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -110,7 +110,7 @@ public class ArrayTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -118,7 +118,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -145,7 +145,7 @@ public class ArrayTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<@Valid ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -153,7 +153,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<@Valid ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
index fb115cbebd6..afe9095fc3a 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/BigCat.java
@@ -103,7 +103,7 @@ public class BigCat extends Cat {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -111,7 +111,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@jakarta.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
index 75ffc68734a..3391b762cfa 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -78,7 +78,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -86,7 +86,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -104,7 +104,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -112,7 +112,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -130,7 +130,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -138,7 +138,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -156,7 +156,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -164,7 +164,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -182,7 +182,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -190,7 +190,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -208,7 +208,7 @@ public class Capitalization {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -216,7 +216,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
index 968e3c1a093..67c104f1ee9 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Cat.java
@@ -67,7 +67,7 @@ public class Cat extends Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -75,7 +75,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
index e15375f3bec..89146cb191e 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Category.java
@@ -58,7 +58,7 @@ public class Category {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -85,7 +85,7 @@ public class Category {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -93,7 +93,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
index 18aeff1c552..6a658186362 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public class ClassModel {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
index 688ecce52ee..800cc12f7fa 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Client.java
@@ -53,7 +53,7 @@ public class Client {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -61,7 +61,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
index cce91a43a74..f797e289581 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Dog.java
@@ -64,7 +64,7 @@ public class Dog extends Animal {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -72,7 +72,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
index f05fa0f7222..bede10b6bd2 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -131,7 +131,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -139,7 +139,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -165,7 +165,7 @@ public class EnumArrays {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -173,7 +173,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
index 886d8fb3b76..7844c5358ce 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -219,7 +219,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -227,7 +227,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -246,7 +246,7 @@ public class EnumTest {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -254,7 +254,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -272,7 +272,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -280,7 +280,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -298,7 +298,7 @@ public class EnumTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -306,7 +306,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -325,7 +325,7 @@ public class EnumTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -333,7 +333,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@jakarta.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index cada12453b2..1f1fdcf35d6 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -63,7 +63,7 @@ public class FileSchemaTestClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -71,7 +71,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -98,7 +98,7 @@ public class FileSchemaTestClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid ModelFile> getFiles() {
@@ -106,7 +106,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<@Valid ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
index 8ca67a1a06e..3c18128f59f 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -126,7 +126,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Min(10) @Max(100)
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -134,7 +134,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -154,7 +154,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Min(20) @Max(200)
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -162,7 +162,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -180,7 +180,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -188,7 +188,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -210,7 +210,7 @@ public class FormatTest {
   @NotNull
   @Valid
  @DecimalMin("32.1") @DecimalMax("543.2")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -218,7 +218,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -238,7 +238,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("54.3") @DecimalMax("987.6")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -246,7 +246,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @DecimalMin("67.8") @DecimalMax("123.4")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -292,7 +292,7 @@ public class FormatTest {
    */
   @jakarta.annotation.Nullable
  @Pattern(regexp="/[a-z]/i")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -300,7 +300,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -319,7 +319,7 @@ public class FormatTest {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -327,7 +327,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -346,7 +346,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -354,7 +354,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -374,7 +374,7 @@ public class FormatTest {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -382,7 +382,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -401,7 +401,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -409,7 +409,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -428,7 +428,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -436,7 +436,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -455,7 +455,7 @@ public class FormatTest {
   @jakarta.annotation.Nonnull
   @NotNull
  @Size(min=10,max=64)
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -463,7 +463,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -482,7 +482,7 @@ public class FormatTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -490,7 +490,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@jakarta.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 94bb5f78d66..c6c0c4048e6 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -51,8 +51,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -65,7 +65,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -80,7 +80,7 @@ public class HasOnlyReadOnly {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
index f1e2049deb7..a74c3358579 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MapTest.java
@@ -114,7 +114,7 @@ public class MapTest {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -122,7 +122,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -148,7 +148,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -156,7 +156,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -182,7 +182,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -190,7 +190,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -216,7 +216,7 @@ public class MapTest {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -224,7 +224,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 8b6afe61668..d9fe5e4b3d0 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -69,7 +69,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -77,7 +77,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -96,7 +96,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -104,7 +104,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -139,7 +139,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
index 2dd824d3cde..c49524b23b6 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,7 +85,7 @@ public class Model200Response {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -93,7 +93,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index b9e2b3209a3..d714136dc2c 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -64,7 +64,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -72,7 +72,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,7 +90,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -98,7 +98,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -116,7 +116,7 @@ public class ModelApiResponse {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -124,7 +124,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
index 210fdbca8c2..507ea6b9768 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public class ModelFile {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
index 638249853d5..fa9cd237fb5 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelList.java
@@ -54,7 +54,7 @@ public class ModelList {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -62,7 +62,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
index 4ef980ddbb3..84c1a7ba1e7 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public class ModelReturn {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
index 6b70762e6dd..d1f82440db5 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Name.java
@@ -60,8 +60,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -81,7 +81,7 @@ public class Name {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -89,7 +89,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -101,7 +101,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -122,7 +122,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -130,7 +130,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -142,7 +142,7 @@ public class Name {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
index 7c7c095179c..e7d01cba9d5 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -55,7 +55,7 @@ public class NumberOnly {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -63,7 +63,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
index 48bf1a1bef2..0a88a7ad6aa 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Order.java
@@ -116,7 +116,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -124,7 +124,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -150,7 +150,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -168,7 +168,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -176,7 +176,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -195,7 +195,7 @@ public class Order {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -203,7 +203,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -221,7 +221,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -229,7 +229,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -247,7 +247,7 @@ public class Order {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -255,7 +255,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
index 1bf488f520f..461af6c2f22 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -65,7 +65,7 @@ public class OuterComposite {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -73,7 +73,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -91,7 +91,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -99,7 +99,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -117,7 +117,7 @@ public class OuterComposite {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -125,7 +125,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
index 37512339c09..c4fa19d15d6 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,7 +123,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -131,7 +131,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -150,7 +150,7 @@ public class Pet {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -158,7 +158,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -177,7 +177,7 @@ public class Pet {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -185,7 +185,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -212,7 +212,7 @@ public class Pet {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -221,7 +221,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -248,7 +248,7 @@ public class Pet {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<@Valid Tag> getTags() {
@@ -256,7 +256,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<@Valid Tag> tags) {
     this.tags = tags;
@@ -274,7 +274,7 @@ public class Pet {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -282,7 +282,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index a534ee81e00..6535b5f95fe 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -50,7 +50,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -83,7 +83,7 @@ public class ReadOnlyFirst {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -91,7 +91,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
index c7fd24aaac6..efb3a1de3b3 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -54,7 +54,7 @@ public class SpecialModelName {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -62,7 +62,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
index e3588b9f5ea..e58f000e961 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Tag.java
@@ -58,7 +58,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -66,7 +66,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public class Tag {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index b367d3bf73b..71099d0ea1f 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -78,7 +78,7 @@ public class TypeHolderDefault {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -86,7 +86,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@jakarta.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -106,7 +106,7 @@ public class TypeHolderDefault {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -114,7 +114,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@jakarta.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -133,7 +133,7 @@ public class TypeHolderDefault {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -141,7 +141,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@jakarta.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -160,7 +160,7 @@ public class TypeHolderDefault {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -168,7 +168,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@jakarta.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -195,7 +195,7 @@ public class TypeHolderDefault {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -203,7 +203,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@jakarta.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index d18a4751b3e..e594190018a 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -83,7 +83,7 @@ public class TypeHolderExample {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -91,7 +91,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@jakarta.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -111,7 +111,7 @@ public class TypeHolderExample {
   @NotNull
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -119,7 +119,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@jakarta.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -138,7 +138,7 @@ public class TypeHolderExample {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -146,7 +146,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@jakarta.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -165,7 +165,7 @@ public class TypeHolderExample {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -173,7 +173,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@jakarta.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -192,7 +192,7 @@ public class TypeHolderExample {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -200,7 +200,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@jakarta.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -227,7 +227,7 @@ public class TypeHolderExample {
   @jakarta.annotation.Nonnull
   @NotNull
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -235,7 +235,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@jakarta.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
index be191af70ea..05b437d4084 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/User.java
@@ -88,7 +88,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -96,7 +96,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -114,7 +114,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -122,7 +122,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -140,7 +140,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -148,7 +148,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -166,7 +166,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -174,7 +174,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -192,7 +192,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -200,7 +200,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -218,7 +218,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -226,7 +226,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -244,7 +244,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -252,7 +252,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -270,7 +270,7 @@ public class User {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -278,7 +278,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
index b895008c76a..41569415677 100644
--- a/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -197,7 +197,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -205,7 +205,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@jakarta.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -224,7 +224,7 @@ public class XmlItem {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -232,7 +232,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@jakarta.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -250,7 +250,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -258,7 +258,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@jakarta.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -276,7 +276,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -284,7 +284,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@jakarta.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -310,7 +310,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -318,7 +318,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@jakarta.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -336,7 +336,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -344,7 +344,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@jakarta.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -363,7 +363,7 @@ public class XmlItem {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -371,7 +371,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@jakarta.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -389,7 +389,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -397,7 +397,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@jakarta.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -415,7 +415,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -423,7 +423,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@jakarta.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -449,7 +449,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -457,7 +457,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@jakarta.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -483,7 +483,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -491,7 +491,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@jakarta.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -509,7 +509,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -517,7 +517,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@jakarta.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -536,7 +536,7 @@ public class XmlItem {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -544,7 +544,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@jakarta.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -562,7 +562,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -570,7 +570,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@jakarta.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -588,7 +588,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -596,7 +596,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@jakarta.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -622,7 +622,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -630,7 +630,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@jakarta.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -656,7 +656,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -664,7 +664,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@jakarta.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -682,7 +682,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -690,7 +690,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@jakarta.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -709,7 +709,7 @@ public class XmlItem {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -717,7 +717,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@jakarta.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -735,7 +735,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -743,7 +743,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@jakarta.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -761,7 +761,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -769,7 +769,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@jakarta.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -795,7 +795,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -803,7 +803,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@jakarta.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -829,7 +829,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -837,7 +837,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@jakarta.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -855,7 +855,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -863,7 +863,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@jakarta.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -882,7 +882,7 @@ public class XmlItem {
   @jakarta.annotation.Nullable
   @Valid
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -890,7 +890,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@jakarta.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -908,7 +908,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -916,7 +916,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@jakarta.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -934,7 +934,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -942,7 +942,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@jakarta.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -968,7 +968,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -976,7 +976,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@jakarta.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -1002,7 +1002,7 @@ public class XmlItem {
    */
   @jakarta.annotation.Nullable
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -1010,7 +1010,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@jakarta.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
index 8afd2f5020e..610378be1a1 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesAnyType.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesAnyType extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
index cec74b5439c..0b2756a13a2 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesArray.java
@@ -54,7 +54,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class AdditionalPropertiesArray extends HashMap<String, List> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
index 864af85f525..20dc974d3eb 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesBoolean.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesBoolean extends HashMap<String, Boolean> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 5fc006ae735..c8a10cd27d4 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -112,7 +112,7 @@ public class AdditionalPropertiesClass {
    * @return mapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapString() {
@@ -120,7 +120,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapString(@javax.annotation.Nullable Map<String, String> mapString) {
     this.mapString = mapString;
@@ -145,7 +145,7 @@ public class AdditionalPropertiesClass {
    * @return mapNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getMapNumber() {
@@ -153,7 +153,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapNumber(@javax.annotation.Nullable Map<String, BigDecimal> mapNumber) {
     this.mapNumber = mapNumber;
@@ -178,7 +178,7 @@ public class AdditionalPropertiesClass {
    * @return mapInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Integer> getMapInteger() {
@@ -186,7 +186,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapInteger(@javax.annotation.Nullable Map<String, Integer> mapInteger) {
     this.mapInteger = mapInteger;
@@ -211,7 +211,7 @@ public class AdditionalPropertiesClass {
    * @return mapBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getMapBoolean() {
@@ -219,7 +219,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MAP_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapBoolean(@javax.annotation.Nullable Map<String, Boolean> mapBoolean) {
     this.mapBoolean = mapBoolean;
@@ -244,7 +244,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Integer>> getMapArrayInteger() {
@@ -252,7 +252,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayInteger(@javax.annotation.Nullable Map<String, List<Integer>> mapArrayInteger) {
     this.mapArrayInteger = mapArrayInteger;
@@ -277,7 +277,7 @@ public class AdditionalPropertiesClass {
    * @return mapArrayAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, List<Object>> getMapArrayAnytype() {
@@ -285,7 +285,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_ARRAY_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_ARRAY_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapArrayAnytype(@javax.annotation.Nullable Map<String, List<Object>> mapArrayAnytype) {
     this.mapArrayAnytype = mapArrayAnytype;
@@ -310,7 +310,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapString() {
@@ -318,7 +318,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapString) {
     this.mapMapString = mapMapString;
@@ -343,7 +343,7 @@ public class AdditionalPropertiesClass {
    * @return mapMapAnytype
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, Object>> getMapMapAnytype() {
@@ -351,7 +351,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_ANYTYPE)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_ANYTYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapAnytype(@javax.annotation.Nullable Map<String, Map<String, Object>> mapMapAnytype) {
     this.mapMapAnytype = mapMapAnytype;
@@ -368,7 +368,7 @@ public class AdditionalPropertiesClass {
    * @return anytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype1() {
@@ -376,7 +376,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype1(@javax.annotation.Nullable Object anytype1) {
     this.anytype1 = anytype1;
@@ -393,7 +393,7 @@ public class AdditionalPropertiesClass {
    * @return anytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype2() {
@@ -401,7 +401,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype2(@javax.annotation.Nullable Object anytype2) {
     this.anytype2 = anytype2;
@@ -418,7 +418,7 @@ public class AdditionalPropertiesClass {
    * @return anytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getAnytype3() {
@@ -426,7 +426,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE3, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAnytype3(@javax.annotation.Nullable Object anytype3) {
     this.anytype3 = anytype3;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
index c0628c3f799..139c4eb9323 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesInteger.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesInteger extends HashMap<String, Integer> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
index 87d3efd48e4..e3bc73e2947 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesNumber.java
@@ -54,7 +54,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class AdditionalPropertiesNumber extends HashMap<String, BigDecimal> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
index f5bb8adb470..0e559595190 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesObject.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesObject extends HashMap<String, Map> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
index b2ac0ee76ee..9ecc332272b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/AdditionalPropertiesString.java
@@ -53,7 +53,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -61,7 +61,7 @@ public class AdditionalPropertiesString extends HashMap<String, String> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
index 4dfe4513e00..093d8446f10 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Animal.java
@@ -69,7 +69,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -77,7 +77,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -94,7 +94,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -102,7 +102,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6ce9b83c67e..c2d684e2fcf 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f36135202ce..28fbf8c2d5b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2453f58cc35..e0175f2d03d 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
index 07c91941dbf..d9c0cb3a9a0 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/BigCat.java
@@ -100,7 +100,7 @@ public class BigCat extends Cat {
    * @return kind
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public KindEnum getKind() {
@@ -108,7 +108,7 @@ public class BigCat extends Cat {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_KIND)
+  @JsonProperty(value = JSON_PROPERTY_KIND, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setKind(@javax.annotation.Nullable KindEnum kind) {
     this.kind = kind;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
index 5682f213b65..e4864216208 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
index 6e1800185d6..f4ea08ab72b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Cat.java
@@ -64,7 +64,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -72,7 +72,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
index 78cc077529b..249f14c58a6 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
index 74dd4385a90..bc883861da5 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
index 99fe381a876..76b0c5cac91 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
index 9c932cb01bd..63cc53e6602 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
index e6cca680c1f..95af14f9eb1 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
index da91df336aa..6c7c1718ee7 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -216,7 +216,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -224,7 +224,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -241,7 +241,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -249,7 +249,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -266,7 +266,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -274,7 +274,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -291,7 +291,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -299,7 +299,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -316,7 +316,7 @@ public class EnumTest {
    * @return outerEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnum getOuterEnum() {
@@ -324,7 +324,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
     this.outerEnum = outerEnum;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a05efa3c913..28eae4a9c51 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
index c62bf47bde8..c17bd7a09c1 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -123,7 +123,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -131,7 +131,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -150,7 +150,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -158,7 +158,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -175,7 +175,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -183,7 +183,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -202,7 +202,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -210,7 +210,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -229,7 +229,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -237,7 +237,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -256,7 +256,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -264,7 +264,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -281,7 +281,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -289,7 +289,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -306,7 +306,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -314,7 +314,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -331,7 +331,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public AsyncFile getBinary() {
@@ -339,7 +339,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable AsyncFile binary) {
     this.binary = binary;
@@ -356,7 +356,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -364,7 +364,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -381,7 +381,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -389,7 +389,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -406,7 +406,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -414,7 +414,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -431,7 +431,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -439,7 +439,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -456,7 +456,7 @@ public class FormatTest {
    * @return bigDecimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getBigDecimal() {
@@ -464,7 +464,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BIG_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_BIG_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBigDecimal(@javax.annotation.Nullable BigDecimal bigDecimal) {
     this.bigDecimal = bigDecimal;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index ef912674bde..dd34438d5ed 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
index ec9e81743d7..99c72041af4 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b480c7d542d..d0219f2e217 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
index 2a69b55cfd6..7a268eb4a14 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f080773624a..1255ae56e3d 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
index 21f812364f0..45f97655028 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
index c24868360f6..dfef26ef7fb 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
index b7ca4af717d..6901c048a0a 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
index dce25ead211..4c67288873e 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Name.java
@@ -58,8 +58,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
index a91f0c49358..c0748fb6a1c 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
index 64b26edbd41..54308806a1d 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3ba67944ba1..d4122b6599f 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
index 2a0fdfd8c10..91c27389915 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d1147f1fda3..eee83de7ead 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 2d571740d95..4ab74a64c27 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
index c46a759548f..666772aed4b 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
index 0548be6b0e3..10f17b5ff91 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderDefault.java
@@ -74,7 +74,7 @@ public class TypeHolderDefault {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -82,7 +82,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -99,7 +99,7 @@ public class TypeHolderDefault {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -107,7 +107,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -124,7 +124,7 @@ public class TypeHolderDefault {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -132,7 +132,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -149,7 +149,7 @@ public class TypeHolderDefault {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -157,7 +157,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -182,7 +182,7 @@ public class TypeHolderDefault {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -190,7 +190,7 @@ public class TypeHolderDefault {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
index 39766e339f9..d482405dc44 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/TypeHolderExample.java
@@ -79,7 +79,7 @@ public class TypeHolderExample {
    * @return stringItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getStringItem() {
@@ -87,7 +87,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_STRING_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setStringItem(@javax.annotation.Nonnull String stringItem) {
     this.stringItem = stringItem;
@@ -104,7 +104,7 @@ public class TypeHolderExample {
    * @return numberItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumberItem() {
@@ -112,7 +112,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumberItem(@javax.annotation.Nonnull BigDecimal numberItem) {
     this.numberItem = numberItem;
@@ -129,7 +129,7 @@ public class TypeHolderExample {
    * @return floatItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Float getFloatItem() {
@@ -137,7 +137,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setFloatItem(@javax.annotation.Nonnull Float floatItem) {
     this.floatItem = floatItem;
@@ -154,7 +154,7 @@ public class TypeHolderExample {
    * @return integerItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getIntegerItem() {
@@ -162,7 +162,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setIntegerItem(@javax.annotation.Nonnull Integer integerItem) {
     this.integerItem = integerItem;
@@ -179,7 +179,7 @@ public class TypeHolderExample {
    * @return boolItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Boolean getBoolItem() {
@@ -187,7 +187,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BOOL_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_BOOL_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setBoolItem(@javax.annotation.Nonnull Boolean boolItem) {
     this.boolItem = boolItem;
@@ -212,7 +212,7 @@ public class TypeHolderExample {
    * @return arrayItem
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<Integer> getArrayItem() {
@@ -220,7 +220,7 @@ public class TypeHolderExample {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setArrayItem(@javax.annotation.Nonnull List<Integer> arrayItem) {
     this.arrayItem = arrayItem;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
index 006f4222a31..f342e9bcd3a 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
index f10791f784a..92df8c1d5b3 100644
--- a/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
+++ b/samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/XmlItem.java
@@ -194,7 +194,7 @@ public class XmlItem {
    * @return attributeString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getAttributeString() {
@@ -202,7 +202,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeString(@javax.annotation.Nullable String attributeString) {
     this.attributeString = attributeString;
@@ -219,7 +219,7 @@ public class XmlItem {
    * @return attributeNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getAttributeNumber() {
@@ -227,7 +227,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeNumber(@javax.annotation.Nullable BigDecimal attributeNumber) {
     this.attributeNumber = attributeNumber;
@@ -244,7 +244,7 @@ public class XmlItem {
    * @return attributeInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getAttributeInteger() {
@@ -252,7 +252,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeInteger(@javax.annotation.Nullable Integer attributeInteger) {
     this.attributeInteger = attributeInteger;
@@ -269,7 +269,7 @@ public class XmlItem {
    * @return attributeBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getAttributeBoolean() {
@@ -277,7 +277,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ATTRIBUTE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_ATTRIBUTE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAttributeBoolean(@javax.annotation.Nullable Boolean attributeBoolean) {
     this.attributeBoolean = attributeBoolean;
@@ -302,7 +302,7 @@ public class XmlItem {
    * @return wrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getWrappedArray() {
@@ -310,7 +310,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setWrappedArray(@javax.annotation.Nullable List<Integer> wrappedArray) {
     this.wrappedArray = wrappedArray;
@@ -327,7 +327,7 @@ public class XmlItem {
    * @return nameString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNameString() {
@@ -335,7 +335,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAME_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameString(@javax.annotation.Nullable String nameString) {
     this.nameString = nameString;
@@ -352,7 +352,7 @@ public class XmlItem {
    * @return nameNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNameNumber() {
@@ -360,7 +360,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameNumber(@javax.annotation.Nullable BigDecimal nameNumber) {
     this.nameNumber = nameNumber;
@@ -377,7 +377,7 @@ public class XmlItem {
    * @return nameInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNameInteger() {
@@ -385,7 +385,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAME_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameInteger(@javax.annotation.Nullable Integer nameInteger) {
     this.nameInteger = nameInteger;
@@ -402,7 +402,7 @@ public class XmlItem {
    * @return nameBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNameBoolean() {
@@ -410,7 +410,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAME_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameBoolean(@javax.annotation.Nullable Boolean nameBoolean) {
     this.nameBoolean = nameBoolean;
@@ -435,7 +435,7 @@ public class XmlItem {
    * @return nameArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameArray() {
@@ -443,7 +443,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameArray(@javax.annotation.Nullable List<Integer> nameArray) {
     this.nameArray = nameArray;
@@ -468,7 +468,7 @@ public class XmlItem {
    * @return nameWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNameWrappedArray() {
@@ -476,7 +476,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAME_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNameWrappedArray(@javax.annotation.Nullable List<Integer> nameWrappedArray) {
     this.nameWrappedArray = nameWrappedArray;
@@ -493,7 +493,7 @@ public class XmlItem {
    * @return prefixString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixString() {
@@ -501,7 +501,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixString(@javax.annotation.Nullable String prefixString) {
     this.prefixString = prefixString;
@@ -518,7 +518,7 @@ public class XmlItem {
    * @return prefixNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNumber() {
@@ -526,7 +526,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNumber(@javax.annotation.Nullable BigDecimal prefixNumber) {
     this.prefixNumber = prefixNumber;
@@ -543,7 +543,7 @@ public class XmlItem {
    * @return prefixInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixInteger() {
@@ -551,7 +551,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixInteger(@javax.annotation.Nullable Integer prefixInteger) {
     this.prefixInteger = prefixInteger;
@@ -568,7 +568,7 @@ public class XmlItem {
    * @return prefixBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixBoolean() {
@@ -576,7 +576,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixBoolean(@javax.annotation.Nullable Boolean prefixBoolean) {
     this.prefixBoolean = prefixBoolean;
@@ -601,7 +601,7 @@ public class XmlItem {
    * @return prefixArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixArray() {
@@ -609,7 +609,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixArray(@javax.annotation.Nullable List<Integer> prefixArray) {
     this.prefixArray = prefixArray;
@@ -634,7 +634,7 @@ public class XmlItem {
    * @return prefixWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixWrappedArray() {
@@ -642,7 +642,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixWrappedArray(@javax.annotation.Nullable List<Integer> prefixWrappedArray) {
     this.prefixWrappedArray = prefixWrappedArray;
@@ -659,7 +659,7 @@ public class XmlItem {
    * @return namespaceString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getNamespaceString() {
@@ -667,7 +667,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceString(@javax.annotation.Nullable String namespaceString) {
     this.namespaceString = namespaceString;
@@ -684,7 +684,7 @@ public class XmlItem {
    * @return namespaceNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getNamespaceNumber() {
@@ -692,7 +692,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceNumber(@javax.annotation.Nullable BigDecimal namespaceNumber) {
     this.namespaceNumber = namespaceNumber;
@@ -709,7 +709,7 @@ public class XmlItem {
    * @return namespaceInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getNamespaceInteger() {
@@ -717,7 +717,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceInteger(@javax.annotation.Nullable Integer namespaceInteger) {
     this.namespaceInteger = namespaceInteger;
@@ -734,7 +734,7 @@ public class XmlItem {
    * @return namespaceBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getNamespaceBoolean() {
@@ -742,7 +742,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceBoolean(@javax.annotation.Nullable Boolean namespaceBoolean) {
     this.namespaceBoolean = namespaceBoolean;
@@ -767,7 +767,7 @@ public class XmlItem {
    * @return namespaceArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceArray() {
@@ -775,7 +775,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceArray(@javax.annotation.Nullable List<Integer> namespaceArray) {
     this.namespaceArray = namespaceArray;
@@ -800,7 +800,7 @@ public class XmlItem {
    * @return namespaceWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getNamespaceWrappedArray() {
@@ -808,7 +808,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NAMESPACE_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNamespaceWrappedArray(@javax.annotation.Nullable List<Integer> namespaceWrappedArray) {
     this.namespaceWrappedArray = namespaceWrappedArray;
@@ -825,7 +825,7 @@ public class XmlItem {
    * @return prefixNsString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPrefixNsString() {
@@ -833,7 +833,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_STRING)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsString(@javax.annotation.Nullable String prefixNsString) {
     this.prefixNsString = prefixNsString;
@@ -850,7 +850,7 @@ public class XmlItem {
    * @return prefixNsNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getPrefixNsNumber() {
@@ -858,7 +858,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsNumber(@javax.annotation.Nullable BigDecimal prefixNsNumber) {
     this.prefixNsNumber = prefixNsNumber;
@@ -875,7 +875,7 @@ public class XmlItem {
    * @return prefixNsInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getPrefixNsInteger() {
@@ -883,7 +883,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsInteger(@javax.annotation.Nullable Integer prefixNsInteger) {
     this.prefixNsInteger = prefixNsInteger;
@@ -900,7 +900,7 @@ public class XmlItem {
    * @return prefixNsBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getPrefixNsBoolean() {
@@ -908,7 +908,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsBoolean(@javax.annotation.Nullable Boolean prefixNsBoolean) {
     this.prefixNsBoolean = prefixNsBoolean;
@@ -933,7 +933,7 @@ public class XmlItem {
    * @return prefixNsArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsArray() {
@@ -941,7 +941,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsArray(@javax.annotation.Nullable List<Integer> prefixNsArray) {
     this.prefixNsArray = prefixNsArray;
@@ -966,7 +966,7 @@ public class XmlItem {
    * @return prefixNsWrappedArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Integer> getPrefixNsWrappedArray() {
@@ -974,7 +974,7 @@ public class XmlItem {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_PREFIX_NS_WRAPPED_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPrefixNsWrappedArray(@javax.annotation.Nullable List<Integer> prefixNsWrappedArray) {
     this.prefixNsWrappedArray = prefixNsWrappedArray;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index f99361d4d0a..0536c33fe90 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 26d46cb0ac9..6d8944fce3d 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Animal.java
index 5ef4c91df20..19755da7cd8 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6ce9b83c67e..c2d684e2fcf 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f36135202ce..28fbf8c2d5b 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2453f58cc35..e0175f2d03d 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Capitalization.java
index 5682f213b65..e4864216208 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Cat.java
index 33872f36026..be8e7fd55e9 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Category.java
index 78cc077529b..249f14c58a6 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index ec7b8f7e313..f0910711118 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ClassModel.java
index 74dd4385a90..bc883861da5 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Client.java
index 99fe381a876..76b0c5cac91 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 667be6e27ff..d06066490e9 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Dog.java
index 9c932cb01bd..63cc53e6602 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumArrays.java
index e6cca680c1f..95af14f9eb1 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumTest.java
index fd1ad1a42dc..905dfb17455 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,14 +344,14 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 16f1b68bbcd..4e6af414357 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a05efa3c913..28eae4a9c51 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Foo.java
index c85972a7b23..9da778b7804 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1f2159ab4ec..48668506357 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FormatTest.java
index 5e18bcfc2fd..89e3d930d0e 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public AsyncFile getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable AsyncFile binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index ef912674bde..dd34438d5ed 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index e7acb5847d1..6c68cba6f3c 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,14 +60,14 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MapTest.java
index ec9e81743d7..99c72041af4 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b480c7d542d..d0219f2e217 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Model200Response.java
index 2a69b55cfd6..7a268eb4a14 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f080773624a..1255ae56e3d 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelFile.java
index 21f812364f0..45f97655028 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelList.java
index c24868360f6..dfef26ef7fb 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelReturn.java
index b7ca4af717d..6901c048a0a 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Name.java
index dce25ead211..4c67288873e 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Name.java
@@ -58,8 +58,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NullableClass.java
index 62877f172a8..4d9dc0c5370 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -124,14 +124,14 @@ public class NullableClass extends HashMap<String, Object> {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -157,14 +157,14 @@ public class NullableClass extends HashMap<String, Object> {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -190,14 +190,14 @@ public class NullableClass extends HashMap<String, Object> {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -223,14 +223,14 @@ public class NullableClass extends HashMap<String, Object> {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -256,14 +256,14 @@ public class NullableClass extends HashMap<String, Object> {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -289,14 +289,14 @@ public class NullableClass extends HashMap<String, Object> {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -334,14 +334,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -379,14 +379,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -414,7 +414,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -422,7 +422,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -457,14 +457,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -502,14 +502,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -537,7 +537,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -545,7 +545,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NumberOnly.java
index a91f0c49358..c0748fb6a1c 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 82e32c8a38c..a7865e2253d 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Order.java
index 64b26edbd41..54308806a1d 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3ba67944ba1..d4122b6599f 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 4dd4534e941..db2c78fc32b 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b59dbe0c734..d85b036b919 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,14 +135,14 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Pet.java
index 2a0fdfd8c10..91c27389915 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d1147f1fda3..eee83de7ead 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1e8cf30bc34..9ac2edeb246 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Tag.java
index c46a759548f..666772aed4b 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 59a40a36e96..9e49fc2ab4b 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/User.java
index 006f4222a31..f342e9bcd3a 100644
--- a/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/vertx-supportVertxFuture/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index f99361d4d0a..0536c33fe90 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 26d46cb0ac9..6d8944fce3d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
index 5ef4c91df20..19755da7cd8 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 6ce9b83c67e..c2d684e2fcf 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index f36135202ce..28fbf8c2d5b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
index 2453f58cc35..e0175f2d03d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
index 5682f213b65..e4864216208 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
index 33872f36026..be8e7fd55e9 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
index 78cc077529b..249f14c58a6 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index ec7b8f7e313..f0910711118 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
index 74dd4385a90..bc883861da5 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
index 99fe381a876..76b0c5cac91 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 667be6e27ff..d06066490e9 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
index 9c932cb01bd..63cc53e6602 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
index e6cca680c1f..95af14f9eb1 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
index fd1ad1a42dc..905dfb17455 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,14 +344,14 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
     return outerEnum;
   }
   
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   public void setOuterEnum_JsonNullable(JsonNullable<OuterEnum> outerEnum) {
     this.outerEnum = outerEnum;
   }
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 16f1b68bbcd..4e6af414357 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index a05efa3c913..28eae4a9c51 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
index c85972a7b23..9da778b7804 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1f2159ab4ec..48668506357 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
index 5e18bcfc2fd..89e3d930d0e 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public AsyncFile getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable AsyncFile binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index ef912674bde..dd34438d5ed 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -49,8 +49,8 @@ public class HasOnlyReadOnly {
    */
   @JsonCreator
   public HasOnlyReadOnly(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar, 
-    @JsonProperty(JSON_PROPERTY_FOO) String foo
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar, 
+    @JsonProperty(value = JSON_PROPERTY_FOO, required = false) String foo
   ) {
     this();
     this.bar = bar;
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index e7acb5847d1..6c68cba6f3c 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,14 +60,14 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
     return nullableMessage;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   public void setNullableMessage_JsonNullable(JsonNullable<String> nullableMessage) {
     this.nullableMessage = nullableMessage;
   }
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
index ec9e81743d7..99c72041af4 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index b480c7d542d..d0219f2e217 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
index 2a69b55cfd6..7a268eb4a14 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index f080773624a..1255ae56e3d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
index 21f812364f0..45f97655028 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
index c24868360f6..dfef26ef7fb 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
index b7ca4af717d..6901c048a0a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
index dce25ead211..4c67288873e 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Name.java
@@ -58,8 +58,8 @@ public class Name {
    */
   @JsonCreator
   public Name(
-    @JsonProperty(JSON_PROPERTY_SNAKE_CASE) Integer snakeCase, 
-    @JsonProperty(JSON_PROPERTY_123NUMBER) Integer _123number
+    @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false) Integer snakeCase, 
+    @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false) Integer _123number
   ) {
     this();
     this.snakeCase = snakeCase;
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
index 62877f172a8..4d9dc0c5370 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -124,14 +124,14 @@ public class NullableClass extends HashMap<String, Object> {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
     return integerProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   public void setIntegerProp_JsonNullable(JsonNullable<Integer> integerProp) {
     this.integerProp = integerProp;
   }
@@ -157,14 +157,14 @@ public class NullableClass extends HashMap<String, Object> {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
     return numberProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   public void setNumberProp_JsonNullable(JsonNullable<BigDecimal> numberProp) {
     this.numberProp = numberProp;
   }
@@ -190,14 +190,14 @@ public class NullableClass extends HashMap<String, Object> {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
     return booleanProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   public void setBooleanProp_JsonNullable(JsonNullable<Boolean> booleanProp) {
     this.booleanProp = booleanProp;
   }
@@ -223,14 +223,14 @@ public class NullableClass extends HashMap<String, Object> {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
     return stringProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   public void setStringProp_JsonNullable(JsonNullable<String> stringProp) {
     this.stringProp = stringProp;
   }
@@ -256,14 +256,14 @@ public class NullableClass extends HashMap<String, Object> {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
     return dateProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   public void setDateProp_JsonNullable(JsonNullable<LocalDate> dateProp) {
     this.dateProp = dateProp;
   }
@@ -289,14 +289,14 @@ public class NullableClass extends HashMap<String, Object> {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
     return datetimeProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   public void setDatetimeProp_JsonNullable(JsonNullable<OffsetDateTime> datetimeProp) {
     this.datetimeProp = datetimeProp;
   }
@@ -334,14 +334,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
     return arrayNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   public void setArrayNullableProp_JsonNullable(JsonNullable<List<Object>> arrayNullableProp) {
     this.arrayNullableProp = arrayNullableProp;
   }
@@ -379,14 +379,14 @@ public class NullableClass extends HashMap<String, Object> {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
     return arrayAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setArrayAndItemsNullableProp_JsonNullable(JsonNullable<List<Object>> arrayAndItemsNullableProp) {
     this.arrayAndItemsNullableProp = arrayAndItemsNullableProp;
   }
@@ -414,7 +414,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -422,7 +422,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -457,14 +457,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
     return objectNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   public void setObjectNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectNullableProp) {
     this.objectNullableProp = objectNullableProp;
   }
@@ -502,14 +502,14 @@ public class NullableClass extends HashMap<String, Object> {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
     return objectAndItemsNullableProp;
   }
   
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   public void setObjectAndItemsNullableProp_JsonNullable(JsonNullable<Map<String, Object>> objectAndItemsNullableProp) {
     this.objectAndItemsNullableProp = objectAndItemsNullableProp;
   }
@@ -537,7 +537,7 @@ public class NullableClass extends HashMap<String, Object> {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -545,7 +545,7 @@ public class NullableClass extends HashMap<String, Object> {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
index a91f0c49358..c0748fb6a1c 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 82e32c8a38c..a7865e2253d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
index 64b26edbd41..54308806a1d 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
index 3ba67944ba1..d4122b6599f 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 4dd4534e941..db2c78fc32b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b59dbe0c734..d85b036b919 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,14 +135,14 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
     return nullableProperty;
   }
   
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   public void setNullableProperty_JsonNullable(JsonNullable<String> nullableProperty) {
     this.nullableProperty = nullableProperty;
   }
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
index 2a0fdfd8c10..91c27389915 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index d1147f1fda3..eee83de7ead 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -48,7 +48,7 @@ public class ReadOnlyFirst {
    */
   @JsonCreator
   public ReadOnlyFirst(
-    @JsonProperty(JSON_PROPERTY_BAR) String bar
+    @JsonProperty(value = JSON_PROPERTY_BAR, required = false) String bar
   ) {
     this();
     this.bar = bar;
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1e8cf30bc34..9ac2edeb246 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
index c46a759548f..666772aed4b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 59a40a36e96..9e49fc2ab4b 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -54,7 +54,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -62,7 +62,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest extends HashMap<Strin
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
index 006f4222a31..f342e9bcd3a 100644
--- a/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a90c962979d..649ac5b808f 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@jakarta.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index ed656c05115..a4c5dc44024 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@jakarta.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
index 5d953f42729..a6079a052a2 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@jakarta.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@jakarta.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index a151adc7cec..3f68c19abe6 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@jakarta.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 4fc87ba03b5..83a78a64459 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@jakarta.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
index 9b59d439f18..bdd1cbc6aa7 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@jakarta.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@jakarta.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@jakarta.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
index e25fddbdc25..5fffe092927 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@jakarta.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@jakarta.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@jakarta.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@jakarta.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@jakarta.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@jakarta.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
index d90e7608a7f..623afc5cd55 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@jakarta.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
index a40eb2dde2e..b42bb6a1245 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index a1ab3b1e678..ed50d7e7f7d 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@jakarta.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
index 1bfbadd89a5..27ecd55725e 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
index 34cee327d68..c04a3457e5c 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@jakarta.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index efd8cae5654..8d483ec3e8a 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
index c7826d226a5..1d04776ca4d 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@jakarta.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
index 463d95df3c0..2006c0857f9 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@jakarta.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@jakarta.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
index 988251aa876..03597917fa3 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@jakarta.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@jakarta.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@jakarta.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@jakarta.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@jakarta.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@jakarta.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@jakarta.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 239661740b1..29c8e25c008 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@jakarta.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@jakarta.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 5668a7aea47..40c3c6e52ff 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@jakarta.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@jakarta.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
index 827cbd6bdfe..6bbeb3b5ebd 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@jakarta.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 14364cf9373..a7b34141a2e 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
index 106d38f692c..9b861c8a1a4 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@jakarta.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@jakarta.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@jakarta.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@jakarta.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@jakarta.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@jakarta.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@jakarta.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@jakarta.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@jakarta.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@jakarta.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@jakarta.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@jakarta.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@jakarta.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@jakarta.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 98cd4322dfe..2a4c04441ff 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 8d9de7e7475..9c0ac6478fe 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
index 8610793925e..fbb0c2a250a 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@jakarta.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@jakarta.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@jakarta.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@jakarta.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 3b3b53bd6f4..633c1a3f7ec 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@jakarta.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@jakarta.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
index d0f8853555e..4259b8d2d6f 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@jakarta.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index bf4359eeee1..093fca7f680 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@jakarta.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@jakarta.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
index f7f930b5f81..11ec90d12c8 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@jakarta.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
index 70d61225642..6b2b536f034 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@jakarta.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
index b44e351a32f..97d20efa034 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@jakarta.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
index 1ba9f4b9efb..572c8c455ff 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@jakarta.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
index e7b2b966bda..0e1b52a8814 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@jakarta.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@jakarta.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
index ecd1681390e..e842bfd7f75 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@jakarta.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 4a49fa52b38..4c78d29d6c6 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@jakarta.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@jakarta.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@jakarta.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
index 87736bbf7c4..581de823139 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@jakarta.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@jakarta.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@jakarta.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@jakarta.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
index 6c8f9c1cf22..246cc9e3329 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@jakarta.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@jakarta.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@jakarta.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 9e882650ff8..ee662372ad0 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@jakarta.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index b77f962e34c..c7397c9497b 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@jakarta.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
index 972cf1acaa1..a20cf1b0f14 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@jakarta.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@jakarta.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @jakarta.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@jakarta.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@jakarta.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@jakarta.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 8d99f52aca9..49cbb8b0e0c 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@jakarta.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 469b9950257..0ab26e1be2b 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@jakarta.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
index 837a1aa18ff..c72669d2257 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@jakarta.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 296b99cb24f..c7e901faf9e 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@jakarta.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
index 0d670d5492a..6005ea81bee 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@jakarta.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@jakarta.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@jakarta.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@jakarta.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@jakarta.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@jakarta.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@jakarta.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @jakarta.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@jakarta.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
index cb9773e1e99..50a6e341b9f 100644
--- a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
+++ b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java
@@ -81,7 +81,7 @@ public class ByteArrayObject {
         return nullableArray.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<byte[]> getNullableArray_JsonNullable() {
@@ -108,7 +108,7 @@ public class ByteArrayObject {
    * @return normalArray
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public byte[] getNormalArray() {
@@ -116,7 +116,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NORMAL_ARRAY)
+  @JsonProperty(value = JSON_PROPERTY_NORMAL_ARRAY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setNormalArray(@javax.annotation.Nullable byte[] normalArray) {
     this.normalArray = normalArray;
@@ -139,7 +139,7 @@ public class ByteArrayObject {
         return nullableString.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_STRING)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableString_JsonNullable() {
@@ -166,7 +166,7 @@ public class ByteArrayObject {
    * @return stringField
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getStringField() {
@@ -174,7 +174,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_STRING_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStringField(@javax.annotation.Nullable String stringField) {
     this.stringField = stringField;
@@ -191,7 +191,7 @@ public class ByteArrayObject {
    * @return intField
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getIntField() {
@@ -199,7 +199,7 @@ public class ByteArrayObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT_FIELD)
+  @JsonProperty(value = JSON_PROPERTY_INT_FIELD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIntField(@javax.annotation.Nullable BigDecimal intField) {
     this.intField = intField;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index 92f6253c236..f0d18866595 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -75,7 +75,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -101,7 +101,7 @@ public class AdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -109,7 +109,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 31450778271..840a066677a 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -58,7 +58,7 @@ public class AllOfWithSingleRef {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -66,7 +66,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -84,7 +84,7 @@ public class AllOfWithSingleRef {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -92,7 +92,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
index 9455a7f8a40..294c669464e 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Animal.java
@@ -70,7 +70,7 @@ public class Animal {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -78,7 +78,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -96,7 +96,7 @@ public class Animal {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -104,7 +104,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 04b54ae2a47..80bcd457ada 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public class ArrayOfArrayOfNumberOnly {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -72,7 +72,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 96e75918784..292ca20d8d4 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -64,7 +64,7 @@ public class ArrayOfNumberOnly {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -72,7 +72,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
index c32f88c223a..bb407c4518b 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -74,7 +74,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -82,7 +82,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -108,7 +108,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -116,7 +116,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -142,7 +142,7 @@ public class ArrayTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -150,7 +150,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
index e5f0a5b3ea0..f124bc56c54 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -77,7 +77,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -85,7 +85,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -103,7 +103,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -111,7 +111,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -129,7 +129,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -137,7 +137,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -155,7 +155,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -163,7 +163,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -181,7 +181,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -189,7 +189,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -207,7 +207,7 @@ public class Capitalization {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Name of the pet ")
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -215,7 +215,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
index e88c4a960d3..5f0e8e2056f 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Cat.java
@@ -63,7 +63,7 @@ public class Cat extends Animal {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -71,7 +71,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 05779efcad4..0fd0b765f26 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -57,7 +57,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Category {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index c0b1fe3d484..6a6e845b375 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -64,7 +64,7 @@ public class ChildWithNullable extends ParentWithNullable {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -72,7 +72,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
index e2948579bfe..ba1bb85d00c 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -53,7 +53,7 @@ public class ClassModel {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -61,7 +61,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
index 90d78dd5a4f..3c174b1f9ed 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Client.java
@@ -52,7 +52,7 @@ public class Client {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -60,7 +60,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index b79f5e1d63d..6e01bab8f08 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -54,7 +54,7 @@ public class DeprecatedObject {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -62,7 +62,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
index 14aedb45b6b..512d8611f10 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Dog.java
@@ -63,7 +63,7 @@ public class Dog extends Animal {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -71,7 +71,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
index 9c5613ab92d..1db13240b86 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -130,7 +130,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -138,7 +138,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,7 +164,7 @@ public class EnumArrays {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -172,7 +172,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
index 24706aaea46..ac1503eb607 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -240,7 +240,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -248,7 +248,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -266,7 +266,7 @@ public class EnumTest {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -274,7 +274,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -292,7 +292,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -300,7 +300,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -318,7 +318,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -326,7 +326,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -350,7 +350,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -378,7 +378,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -386,7 +386,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -404,7 +404,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -412,7 +412,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -430,7 +430,7 @@ public class EnumTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -438,7 +438,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 556398c7b59..f5328c99757 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -61,7 +61,7 @@ public class FakeBigDecimalMap200Response {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -69,7 +69,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -95,7 +95,7 @@ public class FakeBigDecimalMap200Response {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -103,7 +103,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index ace595944b7..d484eeda0b2 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -61,7 +61,7 @@ public class FileSchemaTestClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -69,7 +69,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -95,7 +95,7 @@ public class FileSchemaTestClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -103,7 +103,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
index 9c72045fa19..022b9fd557a 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Foo.java
@@ -52,7 +52,7 @@ public class Foo {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -60,7 +60,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 4624fba5493..edf2cc6e828 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -54,7 +54,7 @@ public class FooGetDefaultResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -62,7 +62,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
index 8a0b1508cfc..2f3f2d9419b 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -135,7 +135,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -143,7 +143,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -163,7 +163,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -171,7 +171,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -189,7 +189,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -197,7 +197,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -217,7 +217,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -225,7 +225,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -245,7 +245,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -253,7 +253,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -273,7 +273,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -281,7 +281,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -299,7 +299,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -307,7 +307,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -325,7 +325,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -333,7 +333,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -351,7 +351,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -359,7 +359,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -377,7 +377,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -385,7 +385,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -403,7 +403,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -411,7 +411,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -429,7 +429,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -437,7 +437,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -455,7 +455,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(example = "72f98069-206d-4f12-9f12-3d1e525a8e84", requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -463,7 +463,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -481,7 +481,7 @@ public class FormatTest {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -489,7 +489,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -507,7 +507,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string that is a 10 digit number. Can have leading zeros.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -515,7 +515,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -533,7 +533,7 @@ public class FormatTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "A string starting with 'image_' (case insensitive) and one to three digits following i.e. Image_01.")
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -541,7 +541,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 9b8481be246..cb7979a0f00 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -64,7 +64,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class HasOnlyReadOnly {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 287113fe425..22407af20cb 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -63,7 +63,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
index e10ede1f927..5c36056ce6d 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MapTest.java
@@ -112,7 +112,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -120,7 +120,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -146,7 +146,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -154,7 +154,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -180,7 +180,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -188,7 +188,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -214,7 +214,7 @@ public class MapTest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -222,7 +222,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 1ba95b2589b..af7746656cd 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -67,7 +67,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -75,7 +75,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -93,7 +93,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -101,7 +101,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -127,7 +127,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -135,7 +135,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
index d86c6774594..9e59865ab15 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -59,7 +59,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -67,7 +67,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,7 +85,7 @@ public class Model200Response {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -93,7 +93,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 233fa43fef7..02861447555 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -63,7 +63,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -71,7 +71,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -89,7 +89,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -97,7 +97,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -115,7 +115,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -123,7 +123,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
index 00f137ffc12..f063b1c104d 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -54,7 +54,7 @@ public class ModelFile {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Test capitalization")
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -62,7 +62,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
index 04c0031109b..0d535b64889 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelList.java
@@ -53,7 +53,7 @@ public class ModelList {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -61,7 +61,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
index 86646d3353c..6643563a915 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -54,7 +54,7 @@ public class ModelReturn {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -62,7 +62,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
index 884baccb68b..8f4e01b287f 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Name.java
@@ -80,7 +80,7 @@ public class Name {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -88,7 +88,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -100,7 +100,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -121,7 +121,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -129,7 +129,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -141,7 +141,7 @@ public class Name {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
index f55d76b222a..7590ec2f6a1 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -129,7 +129,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -163,7 +163,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -197,7 +197,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -231,7 +231,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -265,7 +265,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -299,7 +299,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -345,7 +345,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -391,7 +391,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -427,7 +427,7 @@ public class NullableClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -435,7 +435,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -471,7 +471,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -517,7 +517,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -553,7 +553,7 @@ public class NullableClass {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -561,7 +561,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
index 6a97846bacc..1084b52aa36 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -53,7 +53,7 @@ public class NumberOnly {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -61,7 +61,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 5e37a6add31..e8c03d64047 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -72,7 +72,7 @@ public class ObjectWithDeprecatedFields {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -80,7 +80,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -100,7 +100,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -108,7 +108,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -136,7 +136,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -164,7 +164,7 @@ public class ObjectWithDeprecatedFields {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -172,7 +172,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 4a653e68a4f..a7678232008 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -115,7 +115,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -123,7 +123,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -141,7 +141,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -149,7 +149,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,7 +167,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -175,7 +175,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -193,7 +193,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -201,7 +201,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -219,7 +219,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -227,7 +227,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -245,7 +245,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -253,7 +253,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
index 895fe236350..9afa9aa7ebc 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -63,7 +63,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -71,7 +71,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -89,7 +89,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -97,7 +97,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -115,7 +115,7 @@ public class OuterComposite {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -123,7 +123,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index 40491e18d1f..17900bbf541 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -53,7 +53,7 @@ public class OuterObjectWithEnumProperty {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -61,7 +61,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index a2df381276a..946b66eaa64 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -106,7 +106,7 @@ public class ParentWithNullable {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -114,7 +114,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -138,7 +138,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 83244ea8aca..c6d9bef024c 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -148,7 +148,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -156,7 +156,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -174,7 +174,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -182,7 +182,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -208,7 +208,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -217,7 +217,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -243,7 +243,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -251,7 +251,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -269,7 +269,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -277,7 +277,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 46dcb78e0f9..ca2a3efa720 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -61,7 +61,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public class ReadOnlyFirst {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -90,7 +90,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
index 1fbc4b11540..4062894a1e9 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -53,7 +53,7 @@ public class SpecialModelName {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -61,7 +61,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index c5d2f12678f..e8a3e8183fb 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -57,7 +57,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -65,7 +65,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -83,7 +83,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -91,7 +91,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 9fb025ce047..5b733844b2e 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -57,7 +57,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -65,7 +65,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
index 2da3ee0db04..23442787c9e 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -87,7 +87,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -95,7 +95,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -113,7 +113,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -121,7 +121,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -139,7 +139,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -147,7 +147,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -165,7 +165,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -173,7 +173,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -191,7 +191,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -199,7 +199,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -217,7 +217,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -225,7 +225,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -243,7 +243,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -251,7 +251,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -269,7 +269,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -277,7 +277,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index fffa31c60b0..c5c1a4729b3 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 7917de6283e..3e834b79c70 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
index d2b30b7be5e..c57ba724019 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 48a9566027c..6872779a024 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index b3618cd6bb3..4cb5c0a30b2 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
index 95b37fd2725..77a277749ee 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
index 69deb4a1f44..603d62302dd 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
index 1811528ef38..52c80d3d031 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
index 2c4f93c1185..069770946bd 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 2d4526d4cc9..f9513c201f3 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d2b984a2cd..df3587f2cb1 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
index 1f741134586..3aa9e08d862 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 6a376d1d3c2..2ac6efe31ae 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
index feabffb7d9e..cf5655a34e4 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
index 1dd2eb4af2f..c960c69487d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
index 29c2ea66790..7467156dd32 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 537bf077a8e..d0c52e55864 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 6c9547de038..400953904eb 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
index 1343e29a90e..58c0c144e2c 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b8e4d184c0f..9870f6d3a4d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
index 72ef0dc8ebd..fa28fe18457 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 1511f85c751..19aa41b3668 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 54fe2822805..1dc69ad7323 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
index 4f8da332db1..728ef0e3f58 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 2f4808e37ca..a5aa126c16b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
index 5b3e06aa982..de54dbab709 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 2fdce143483..a83ea02a10d 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
index e573334caab..638a21db058 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
index a4f2f221946..0a30e58fe24 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
index c4f64dc9a66..6217c43b9dc 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
index 5132a575a66..5c2e5328489 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
index 4fa4b531ce2..b78b3f685e6 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
index 93f1be9d1d9..ee6767819fd 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 8031fc62054..af1347e9cd6 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
index a45e221a64e..06796399c78 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
index 758a2e7dcd6..df1c3898b28 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index bb003e14871..c9d09b761aa 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 6b90f664f54..81102ce36e9 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
index d6bb563afc1..2f23d76354f 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 50e9c6eac9c..4a04863cef8 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
index f77d213e8b7..03eaec13fbf 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
index e5411e1aa51..5b0f5deb613 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 598d5be46bb..839c0fec3f8 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
index d5089f07be6..b5ad5a3154b 100644
--- a/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient-useSingleRequestParameter/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index a4b13544673..ba34e6bd587 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -73,7 +73,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -98,7 +98,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -106,7 +106,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
index 7917de6283e..3e834b79c70 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
@@ -56,7 +56,7 @@ public class AllOfWithSingleRef {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -64,7 +64,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -81,7 +81,7 @@ public class AllOfWithSingleRef {
    * @return singleRefType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public SingleRefType getSingleRefType() {
@@ -89,7 +89,7 @@ public class AllOfWithSingleRef {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SINGLE_REF_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SINGLE_REF_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSingleRefType(@javax.annotation.Nullable SingleRefType singleRefType) {
     this.singleRefType = singleRefType;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
index d2b30b7be5e..c57ba724019 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Animal.java
@@ -68,7 +68,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -76,7 +76,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -93,7 +93,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -101,7 +101,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index 5f8a004d80d..d903902b0fa 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index 9b87a52cef4..8a3e88bef4b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -62,7 +62,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -70,7 +70,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
index 3a595fa6776..cec45a64d2b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -72,7 +72,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -80,7 +80,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -105,7 +105,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -113,7 +113,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -138,7 +138,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -146,7 +146,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
index 69deb4a1f44..603d62302dd 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -75,7 +75,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -83,7 +83,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -100,7 +100,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -108,7 +108,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -125,7 +125,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -133,7 +133,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -150,7 +150,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -158,7 +158,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -175,7 +175,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -183,7 +183,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -200,7 +200,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -208,7 +208,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
index 1811528ef38..52c80d3d031 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Cat.java
@@ -61,7 +61,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -69,7 +69,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
index 2c4f93c1185..069770946bd 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Category.java
@@ -55,7 +55,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
index 2d4526d4cc9..f9513c201f3 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ChildWithNullable.java
@@ -62,7 +62,7 @@ public class ChildWithNullable extends ParentWithNullable {
    * @return otherProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOtherProperty() {
@@ -70,7 +70,7 @@ public class ChildWithNullable extends ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OTHER_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_OTHER_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOtherProperty(@javax.annotation.Nullable String otherProperty) {
     this.otherProperty = otherProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
index 1d2b984a2cd..df3587f2cb1 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -50,7 +50,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -58,7 +58,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
index 1f741134586..3aa9e08d862 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Client.java
@@ -50,7 +50,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -58,7 +58,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 6a376d1d3c2..2ac6efe31ae 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -52,7 +52,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -60,7 +60,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
index feabffb7d9e..cf5655a34e4 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Dog.java
@@ -61,7 +61,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -69,7 +69,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
index 0590d680fec..e46d171d7ab 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -128,7 +128,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -136,7 +136,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -161,7 +161,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -169,7 +169,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
index 29c2ea66790..7467156dd32 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -238,7 +238,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -246,7 +246,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -263,7 +263,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -271,7 +271,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -288,7 +288,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -296,7 +296,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -313,7 +313,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -321,7 +321,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -344,7 +344,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -371,7 +371,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -379,7 +379,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -396,7 +396,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -404,7 +404,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -421,7 +421,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -429,7 +429,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
index 5b295cd44c1..5aecb559dba 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FakeBigDecimalMap200Response.java
@@ -59,7 +59,7 @@ public class FakeBigDecimalMap200Response {
    * @return someId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getSomeId() {
@@ -67,7 +67,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_ID)
+  @JsonProperty(value = JSON_PROPERTY_SOME_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeId(@javax.annotation.Nullable BigDecimal someId) {
     this.someId = someId;
@@ -92,7 +92,7 @@ public class FakeBigDecimalMap200Response {
    * @return someMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, BigDecimal> getSomeMap() {
@@ -100,7 +100,7 @@ public class FakeBigDecimalMap200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_MAP)
+  @JsonProperty(value = JSON_PROPERTY_SOME_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeMap(@javax.annotation.Nullable Map<String, BigDecimal> someMap) {
     this.someMap = someMap;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index 5f861d37f8d..4ba01a505bf 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -59,7 +59,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -67,7 +67,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -92,7 +92,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -100,7 +100,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
index 1343e29a90e..58c0c144e2c 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Foo.java
@@ -50,7 +50,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -58,7 +58,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index b8e4d184c0f..9870f6d3a4d 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -52,7 +52,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -60,7 +60,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
index 72ef0dc8ebd..fa28fe18457 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -133,7 +133,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -141,7 +141,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -160,7 +160,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -168,7 +168,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -185,7 +185,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -193,7 +193,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -212,7 +212,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -220,7 +220,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -239,7 +239,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -247,7 +247,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -266,7 +266,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -274,7 +274,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -291,7 +291,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -299,7 +299,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -316,7 +316,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -324,7 +324,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -341,7 +341,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -349,7 +349,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -366,7 +366,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -374,7 +374,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -391,7 +391,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -399,7 +399,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -416,7 +416,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -424,7 +424,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -441,7 +441,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -449,7 +449,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -466,7 +466,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -474,7 +474,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -491,7 +491,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -499,7 +499,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -516,7 +516,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -524,7 +524,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 1511f85c751..19aa41b3668 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -62,7 +62,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -76,7 +76,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 54fe2822805..1dc69ad7323 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -60,7 +60,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
index 6635edc3eb3..1428ea74f60 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MapTest.java
@@ -110,7 +110,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -118,7 +118,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -143,7 +143,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -151,7 +151,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -176,7 +176,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -184,7 +184,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -209,7 +209,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -217,7 +217,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f2b05ddc94..11f0c75b6e8 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -65,7 +65,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -73,7 +73,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -90,7 +90,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -98,7 +98,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -123,7 +123,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -131,7 +131,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
index 5b3e06aa982..de54dbab709 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -56,7 +56,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -64,7 +64,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -81,7 +81,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -89,7 +89,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 2fdce143483..a83ea02a10d 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -61,7 +61,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -69,7 +69,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -86,7 +86,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -94,7 +94,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -111,7 +111,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -119,7 +119,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
index e573334caab..638a21db058 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -51,7 +51,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -59,7 +59,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
index a4f2f221946..0a30e58fe24 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelList.java
@@ -51,7 +51,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -59,7 +59,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
index c4f64dc9a66..6217c43b9dc 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -51,7 +51,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -59,7 +59,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
index 5132a575a66..5c2e5328489 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Name.java
@@ -77,7 +77,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -85,7 +85,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -96,7 +96,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -116,7 +116,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -124,7 +124,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -135,7 +135,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
index 3ea75832f02..ea3a9ce0132 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -127,7 +127,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -160,7 +160,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -193,7 +193,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -226,7 +226,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -259,7 +259,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -292,7 +292,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -337,7 +337,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -382,7 +382,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -417,7 +417,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -425,7 +425,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -460,7 +460,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -505,7 +505,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -540,7 +540,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -548,7 +548,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
index 93f1be9d1d9..ee6767819fd 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -51,7 +51,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -59,7 +59,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index 8c871297ab0..199803cfd2e 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -70,7 +70,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -78,7 +78,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -97,7 +97,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -105,7 +105,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -124,7 +124,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -132,7 +132,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -159,7 +159,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -167,7 +167,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
index a45e221a64e..06796399c78 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Order.java
@@ -113,7 +113,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -121,7 +121,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -138,7 +138,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -146,7 +146,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -163,7 +163,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -171,7 +171,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -188,7 +188,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -196,7 +196,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -213,7 +213,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -221,7 +221,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -238,7 +238,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -246,7 +246,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
index 758a2e7dcd6..df1c3898b28 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -61,7 +61,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -69,7 +69,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -86,7 +86,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -94,7 +94,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -111,7 +111,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -119,7 +119,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
index bb003e14871..c9d09b761aa 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
@@ -51,7 +51,7 @@ public class OuterObjectWithEnumProperty {
    * @return value
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public OuterEnumInteger getValue() {
@@ -59,7 +59,7 @@ public class OuterObjectWithEnumProperty {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_VALUE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setValue(@javax.annotation.Nonnull OuterEnumInteger value) {
     this.value = value;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
index 6b90f664f54..81102ce36e9 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java
@@ -104,7 +104,7 @@ public class ParentWithNullable {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -112,7 +112,7 @@ public class ParentWithNullable {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -135,7 +135,7 @@ public class ParentWithNullable {
         return nullableProperty.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableProperty_JsonNullable() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
index 1baadc449a6..bb19131ea51 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Set<String> getPhotoUrls() {
@@ -212,7 +212,7 @@ public class Pet {
 
 
   @JsonDeserialize(as = LinkedHashSet.class)
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull Set<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -237,7 +237,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -245,7 +245,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -262,7 +262,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -270,7 +270,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 50e9c6eac9c..4a04863cef8 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -59,7 +59,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -79,7 +79,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -87,7 +87,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
index f77d213e8b7..03eaec13fbf 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -51,7 +51,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -59,7 +59,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
index e5411e1aa51..5b0f5deb613 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Tag.java
@@ -55,7 +55,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -63,7 +63,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -80,7 +80,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -88,7 +88,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 598d5be46bb..839c0fec3f8 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -55,7 +55,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -63,7 +63,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
index d5089f07be6..b5ad5a3154b 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/User.java
@@ -85,7 +85,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -93,7 +93,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -110,7 +110,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -135,7 +135,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -160,7 +160,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -185,7 +185,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -210,7 +210,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -235,7 +235,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -260,7 +260,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
index d66c3a60265..bfbe607974d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/ChildSchema.java
@@ -66,7 +66,7 @@ public class ChildSchema extends Parent {
    * @return prop1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP1)
+  @JsonProperty(value = JSON_PROPERTY_PROP1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProp1() {
@@ -74,7 +74,7 @@ public class ChildSchema extends Parent {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP1)
+  @JsonProperty(value = JSON_PROPERTY_PROP1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProp1(@javax.annotation.Nullable String prop1) {
     this.prop1 = prop1;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
index 2b7fdc946e7..063a337a9e9 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/MySchemaNameCharacters.java
@@ -67,7 +67,7 @@ public class MySchemaNameCharacters extends Parent {
    * @return prop2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROP2)
+  @JsonProperty(value = JSON_PROPERTY_PROP2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProp2() {
@@ -75,7 +75,7 @@ public class MySchemaNameCharacters extends Parent {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROP2)
+  @JsonProperty(value = JSON_PROPERTY_PROP2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProp2(@javax.annotation.Nullable String prop2) {
     this.prop2 = prop2;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
index 7eb909160bf..7a453b0a431 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/model/Parent.java
@@ -65,7 +65,7 @@ public class Parent {
    * @return objectType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getObjectType() {
@@ -73,7 +73,7 @@ public class Parent {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectType(@javax.annotation.Nullable String objectType) {
     this.objectType = objectType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
index c0b93e33fb3..3f350253099 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Category.java
@@ -61,7 +61,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 302471036fc..5432f052dfd 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -67,7 +67,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -75,7 +75,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -93,7 +93,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -101,7 +101,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -119,7 +119,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -127,7 +127,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
index f4eab45a455..d78429aad2f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Order.java
@@ -119,7 +119,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -127,7 +127,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -153,7 +153,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -171,7 +171,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -179,7 +179,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -197,7 +197,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -205,7 +205,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -223,7 +223,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -231,7 +231,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -249,7 +249,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -257,7 +257,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
index f797b6f8774..255884d6a35 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Pet.java
@@ -123,7 +123,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -131,7 +131,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -149,7 +149,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -157,7 +157,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -175,7 +175,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(example = "doggie", required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -183,7 +183,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -209,7 +209,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @ApiModelProperty(required = true, value = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -217,7 +217,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -243,7 +243,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -251,7 +251,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -272,7 +272,7 @@ public class Pet {
   @Deprecated
   @javax.annotation.Nullable
   @ApiModelProperty(value = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -281,7 +281,7 @@ public class Pet {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
index 916a0d8aff3..7d641e2aa55 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/Tag.java
@@ -61,7 +61,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -69,7 +69,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -87,7 +87,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -95,7 +95,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
index cc19d9b4285..6975d6fc3e5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger1/src/main/java/org/openapitools/client/model/User.java
@@ -91,7 +91,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -99,7 +99,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -117,7 +117,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -125,7 +125,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -143,7 +143,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -151,7 +151,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -169,7 +169,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -177,7 +177,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -195,7 +195,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -203,7 +203,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -221,7 +221,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -229,7 +229,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -247,7 +247,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -255,7 +255,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -273,7 +273,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @ApiModelProperty(value = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -281,7 +281,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
index 7a4d3097252..7161d3ac8ca 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Category.java
@@ -60,7 +60,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,7 +86,7 @@ public class Category {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -94,7 +94,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index 55a545bcfe4..0e5ee97221c 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -66,7 +66,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -74,7 +74,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -92,7 +92,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -100,7 +100,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -118,7 +118,7 @@ public class ModelApiResponse {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -126,7 +126,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
index 0ed4265f873..840737e3af4 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Order.java
@@ -118,7 +118,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -126,7 +126,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -144,7 +144,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -152,7 +152,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -170,7 +170,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -178,7 +178,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -196,7 +196,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -204,7 +204,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -222,7 +222,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "Order Status")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -230,7 +230,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -248,7 +248,7 @@ public class Order {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -256,7 +256,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
index 9e19fa9b54b..740e8c3f3d5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Pet.java
@@ -122,7 +122,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -130,7 +130,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -148,7 +148,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -156,7 +156,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -174,7 +174,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(example = "doggie", requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -182,7 +182,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -208,7 +208,7 @@ public class Pet {
    */
   @javax.annotation.Nonnull
   @Schema(requiredMode = Schema.RequiredMode.REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -216,7 +216,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -242,7 +242,7 @@ public class Pet {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -250,7 +250,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -271,7 +271,7 @@ public class Pet {
   @Deprecated
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "pet status in the store")
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -280,7 +280,7 @@ public class Pet {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
index 2eefeff6e54..b2a8573f11b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/Tag.java
@@ -60,7 +60,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -68,7 +68,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -86,7 +86,7 @@ public class Tag {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -94,7 +94,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
index 53b34252134..152ef11cc20 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8-swagger2/src/main/java/org/openapitools/client/model/User.java
@@ -90,7 +90,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -98,7 +98,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -116,7 +116,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -124,7 +124,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -142,7 +142,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -150,7 +150,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -168,7 +168,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -176,7 +176,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -194,7 +194,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -202,7 +202,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -220,7 +220,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -228,7 +228,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -246,7 +246,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "")
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -254,7 +254,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -272,7 +272,7 @@ public class User {
    */
   @javax.annotation.Nullable
   @Schema(requiredMode = Schema.RequiredMode.NOT_REQUIRED, description = "User Status")
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -280,7 +280,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
index e9a761df01c..14f4977e3a8 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
@@ -102,7 +102,7 @@ public class AdditionalPropertiesClass {
    * @return mapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapProperty() {
@@ -110,7 +110,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapProperty(@javax.annotation.Nullable Map<String, String> mapProperty) {
     this.mapProperty = mapProperty;
@@ -135,7 +135,7 @@ public class AdditionalPropertiesClass {
    * @return mapOfMapProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapOfMapProperty() {
@@ -143,7 +143,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_MAP_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_MAP_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfMapProperty(@javax.annotation.Nullable Map<String, Map<String, String>> mapOfMapProperty) {
     this.mapOfMapProperty = mapOfMapProperty;
@@ -166,7 +166,7 @@ public class AdditionalPropertiesClass {
         return anytype1.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnytype1_JsonNullable() {
@@ -193,7 +193,7 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype1
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype1() {
@@ -201,7 +201,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE1, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype1(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype1) {
     this.mapWithUndeclaredPropertiesAnytype1 = mapWithUndeclaredPropertiesAnytype1;
@@ -218,7 +218,7 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype2
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getMapWithUndeclaredPropertiesAnytype2() {
@@ -226,7 +226,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE2, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype2(@javax.annotation.Nullable Object mapWithUndeclaredPropertiesAnytype2) {
     this.mapWithUndeclaredPropertiesAnytype2 = mapWithUndeclaredPropertiesAnytype2;
@@ -251,7 +251,7 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesAnytype3
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getMapWithUndeclaredPropertiesAnytype3() {
@@ -259,7 +259,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_ANYTYPE3, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesAnytype3(@javax.annotation.Nullable Map<String, Object> mapWithUndeclaredPropertiesAnytype3) {
     this.mapWithUndeclaredPropertiesAnytype3 = mapWithUndeclaredPropertiesAnytype3;
@@ -276,7 +276,7 @@ public class AdditionalPropertiesClass {
    * @return emptyMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getEmptyMap() {
@@ -284,7 +284,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMPTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_EMPTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmptyMap(@javax.annotation.Nullable Object emptyMap) {
     this.emptyMap = emptyMap;
@@ -309,7 +309,7 @@ public class AdditionalPropertiesClass {
    * @return mapWithUndeclaredPropertiesString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, String> getMapWithUndeclaredPropertiesString() {
@@ -317,7 +317,7 @@ public class AdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_WITH_UNDECLARED_PROPERTIES_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapWithUndeclaredPropertiesString(@javax.annotation.Nullable Map<String, String> mapWithUndeclaredPropertiesString) {
     this.mapWithUndeclaredPropertiesString = mapWithUndeclaredPropertiesString;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
index ec382de22bf..8d36bbf6b93 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Animal.java
@@ -72,7 +72,7 @@ public class Animal {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -80,7 +80,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
@@ -97,7 +97,7 @@ public class Animal {
    * @return color
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getColor() {
@@ -105,7 +105,7 @@ public class Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COLOR)
+  @JsonProperty(value = JSON_PROPERTY_COLOR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setColor(@javax.annotation.Nullable String color) {
     this.color = color;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
index 8a1a9c7a915..4fb3916e9bc 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Apple.java
@@ -60,7 +60,7 @@ public class Apple {
    * @return cultivar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCultivar() {
@@ -68,7 +68,7 @@ public class Apple {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCultivar(@javax.annotation.Nullable String cultivar) {
     this.cultivar = cultivar;
@@ -85,7 +85,7 @@ public class Apple {
    * @return origin
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getOrigin() {
@@ -93,7 +93,7 @@ public class Apple {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ORIGIN)
+  @JsonProperty(value = JSON_PROPERTY_ORIGIN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOrigin(@javax.annotation.Nullable String origin) {
     this.origin = origin;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
index 2de9f7af073..69a9d811b0f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/AppleReq.java
@@ -60,7 +60,7 @@ public class AppleReq {
    * @return cultivar
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getCultivar() {
@@ -68,7 +68,7 @@ public class AppleReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CULTIVAR)
+  @JsonProperty(value = JSON_PROPERTY_CULTIVAR, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setCultivar(@javax.annotation.Nonnull String cultivar) {
     this.cultivar = cultivar;
@@ -85,7 +85,7 @@ public class AppleReq {
    * @return mealy
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMealy() {
@@ -93,7 +93,7 @@ public class AppleReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MEALY)
+  @JsonProperty(value = JSON_PROPERTY_MEALY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMealy(@javax.annotation.Nullable Boolean mealy) {
     this.mealy = mealy;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
index a1d5e44a270..d44b15bfb23 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public class ArrayOfArrayOfNumberOnly {
    * @return arrayArrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<BigDecimal>> getArrayArrayNumber() {
@@ -73,7 +73,7 @@ public class ArrayOfArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayNumber(@javax.annotation.Nullable List<List<BigDecimal>> arrayArrayNumber) {
     this.arrayArrayNumber = arrayArrayNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
index a4714902bee..16c2c585cfc 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayOfNumberOnly.java
@@ -65,7 +65,7 @@ public class ArrayOfNumberOnly {
    * @return arrayNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<BigDecimal> getArrayNumber() {
@@ -73,7 +73,7 @@ public class ArrayOfNumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayNumber(@javax.annotation.Nullable List<BigDecimal> arrayNumber) {
     this.arrayNumber = arrayNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
index 174b9b928a4..b1c50ff5fa0 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ArrayTest.java
@@ -75,7 +75,7 @@ public class ArrayTest {
    * @return arrayOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getArrayOfString() {
@@ -83,7 +83,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayOfString(@javax.annotation.Nullable List<String> arrayOfString) {
     this.arrayOfString = arrayOfString;
@@ -108,7 +108,7 @@ public class ArrayTest {
    * @return arrayArrayOfInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<Long>> getArrayArrayOfInteger() {
@@ -116,7 +116,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfInteger(@javax.annotation.Nullable List<List<Long>> arrayArrayOfInteger) {
     this.arrayArrayOfInteger = arrayArrayOfInteger;
@@ -141,7 +141,7 @@ public class ArrayTest {
    * @return arrayArrayOfModel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<List<ReadOnlyFirst>> getArrayArrayOfModel() {
@@ -149,7 +149,7 @@ public class ArrayTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ARRAY_OF_MODEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayArrayOfModel(@javax.annotation.Nullable List<List<ReadOnlyFirst>> arrayArrayOfModel) {
     this.arrayArrayOfModel = arrayArrayOfModel;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
index 5cf56121147..13a5695b6c3 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Banana.java
@@ -56,7 +56,7 @@ public class Banana {
    * @return lengthCm
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getLengthCm() {
@@ -64,7 +64,7 @@ public class Banana {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLengthCm(@javax.annotation.Nullable BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
index 662d5927eb9..59e2e8b7755 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BananaReq.java
@@ -61,7 +61,7 @@ public class BananaReq {
    * @return lengthCm
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getLengthCm() {
@@ -69,7 +69,7 @@ public class BananaReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LENGTH_CM)
+  @JsonProperty(value = JSON_PROPERTY_LENGTH_CM, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setLengthCm(@javax.annotation.Nonnull BigDecimal lengthCm) {
     this.lengthCm = lengthCm;
@@ -86,7 +86,7 @@ public class BananaReq {
    * @return sweet
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getSweet() {
@@ -94,7 +94,7 @@ public class BananaReq {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SWEET)
+  @JsonProperty(value = JSON_PROPERTY_SWEET, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSweet(@javax.annotation.Nullable Boolean sweet) {
     this.sweet = sweet;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
index 4da630e8cb6..709e92325af 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/BasquePig.java
@@ -54,7 +54,7 @@ public class BasquePig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -62,7 +62,7 @@ public class BasquePig {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
index 319a099f0a0..b08bcad3277 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Capitalization.java
@@ -79,7 +79,7 @@ public class Capitalization {
    * @return smallCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallCamel() {
@@ -87,7 +87,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallCamel(@javax.annotation.Nullable String smallCamel) {
     this.smallCamel = smallCamel;
@@ -104,7 +104,7 @@ public class Capitalization {
    * @return capitalCamel
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalCamel() {
@@ -112,7 +112,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_CAMEL)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_CAMEL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalCamel(@javax.annotation.Nullable String capitalCamel) {
     this.capitalCamel = capitalCamel;
@@ -129,7 +129,7 @@ public class Capitalization {
    * @return smallSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSmallSnake() {
@@ -137,7 +137,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SMALL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_SMALL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSmallSnake(@javax.annotation.Nullable String smallSnake) {
     this.smallSnake = smallSnake;
@@ -154,7 +154,7 @@ public class Capitalization {
    * @return capitalSnake
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getCapitalSnake() {
@@ -162,7 +162,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CAPITAL_SNAKE)
+  @JsonProperty(value = JSON_PROPERTY_CAPITAL_SNAKE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCapitalSnake(@javax.annotation.Nullable String capitalSnake) {
     this.capitalSnake = capitalSnake;
@@ -179,7 +179,7 @@ public class Capitalization {
    * @return scAETHFlowPoints
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getScAETHFlowPoints() {
@@ -187,7 +187,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS)
+  @JsonProperty(value = JSON_PROPERTY_SC_A_E_T_H_FLOW_POINTS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setScAETHFlowPoints(@javax.annotation.Nullable String scAETHFlowPoints) {
     this.scAETHFlowPoints = scAETHFlowPoints;
@@ -204,7 +204,7 @@ public class Capitalization {
    * @return ATT_NAME
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getATTNAME() {
@@ -212,7 +212,7 @@ public class Capitalization {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_A_T_T_N_A_M_E)
+  @JsonProperty(value = JSON_PROPERTY_A_T_T_N_A_M_E, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setATTNAME(@javax.annotation.Nullable String ATT_NAME) {
     this.ATT_NAME = ATT_NAME;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
index d030ec9197a..67ad27079a0 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Cat.java
@@ -69,7 +69,7 @@ public class Cat extends Animal {
    * @return declawed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getDeclawed() {
@@ -77,7 +77,7 @@ public class Cat extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECLAWED)
+  @JsonProperty(value = JSON_PROPERTY_DECLAWED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeclawed(@javax.annotation.Nullable Boolean declawed) {
     this.declawed = declawed;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
index db00d8f6566..a3495554927 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Category.java
@@ -59,7 +59,7 @@ public class Category {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public class Category {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public class Category {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
index b037a4abe44..0513013060c 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ChildCat.java
@@ -75,7 +75,7 @@ public class ChildCat extends ParentPet {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -83,7 +83,7 @@ public class ChildCat extends ParentPet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
@@ -108,7 +108,7 @@ public class ChildCat extends ParentPet {
    * @return petType
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPetType() {
@@ -116,7 +116,7 @@ public class ChildCat extends ParentPet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetType(@javax.annotation.Nullable String petType) {
     if (!PET_TYPE_VALUES.contains(petType)) {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
index 9bc1ecb111b..bc96dc18d6a 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ClassModel.java
@@ -54,7 +54,7 @@ public class ClassModel {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -62,7 +62,7 @@ public class ClassModel {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
index 993338995c2..1fabea0eeda 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Client.java
@@ -54,7 +54,7 @@ public class Client {
    * @return client
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getClient() {
@@ -62,7 +62,7 @@ public class Client {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLIENT)
+  @JsonProperty(value = JSON_PROPERTY_CLIENT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setClient(@javax.annotation.Nullable String client) {
     this.client = client;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
index 10373401010..8124cb0c834 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ComplexQuadrilateral.java
@@ -63,7 +63,7 @@ public class ComplexQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -71,7 +71,7 @@ public class ComplexQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -88,7 +88,7 @@ public class ComplexQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -96,7 +96,7 @@ public class ComplexQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
index b123d6a94ab..decabf13e1a 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DanishPig.java
@@ -54,7 +54,7 @@ public class DanishPig {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -62,7 +62,7 @@ public class DanishPig {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
index 1f4d810ff41..f147f647444 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/DeprecatedObject.java
@@ -56,7 +56,7 @@ public class DeprecatedObject {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -64,7 +64,7 @@ public class DeprecatedObject {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
index fc5e733bf42..8b86f748a59 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Dog.java
@@ -68,7 +68,7 @@ public class Dog extends Animal {
    * @return breed
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBreed() {
@@ -76,7 +76,7 @@ public class Dog extends Animal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BREED)
+  @JsonProperty(value = JSON_PROPERTY_BREED, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBreed(@javax.annotation.Nullable String breed) {
     this.breed = breed;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
index a4349e25c6d..c6f787d0b1b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Drawing.java
@@ -81,7 +81,7 @@ public class Drawing {
    * @return mainShape
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Shape getMainShape() {
@@ -89,7 +89,7 @@ public class Drawing {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAIN_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_MAIN_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMainShape(@javax.annotation.Nullable Shape mainShape) {
     this.mainShape = mainShape;
@@ -112,7 +112,7 @@ public class Drawing {
         return shapeOrNull.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_OR_NULL)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_OR_NULL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<ShapeOrNull> getShapeOrNull_JsonNullable() {
@@ -145,7 +145,7 @@ public class Drawing {
         return nullableShape.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_SHAPE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_SHAPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<NullableShape> getNullableShape_JsonNullable() {
@@ -180,7 +180,7 @@ public class Drawing {
    * @return shapes
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Shape> getShapes() {
@@ -188,7 +188,7 @@ public class Drawing {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPES)
+  @JsonProperty(value = JSON_PROPERTY_SHAPES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShapes(@javax.annotation.Nullable List<Shape> shapes) {
     this.shapes = shapes;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
index b4f6b18473e..85756c4f8f3 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumArrays.java
@@ -131,7 +131,7 @@ public class EnumArrays {
    * @return justSymbol
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JustSymbolEnum getJustSymbol() {
@@ -139,7 +139,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_SYMBOL)
+  @JsonProperty(value = JSON_PROPERTY_JUST_SYMBOL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustSymbol(@javax.annotation.Nullable JustSymbolEnum justSymbol) {
     this.justSymbol = justSymbol;
@@ -164,7 +164,7 @@ public class EnumArrays {
    * @return arrayEnum
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ArrayEnumEnum> getArrayEnum() {
@@ -172,7 +172,7 @@ public class EnumArrays {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayEnum(@javax.annotation.Nullable List<ArrayEnumEnum> arrayEnum) {
     this.arrayEnum = arrayEnum;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
index 2ce79666ca8..7b6758a79ad 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EnumTest.java
@@ -281,7 +281,7 @@ public class EnumTest {
    * @return enumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumStringEnum getEnumString() {
@@ -289,7 +289,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumString(@javax.annotation.Nullable EnumStringEnum enumString) {
     this.enumString = enumString;
@@ -306,7 +306,7 @@ public class EnumTest {
    * @return enumStringRequired
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public EnumStringRequiredEnum getEnumStringRequired() {
@@ -314,7 +314,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_STRING_REQUIRED)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_STRING_REQUIRED, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setEnumStringRequired(@javax.annotation.Nonnull EnumStringRequiredEnum enumStringRequired) {
     this.enumStringRequired = enumStringRequired;
@@ -331,7 +331,7 @@ public class EnumTest {
    * @return enumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerEnum getEnumInteger() {
@@ -339,7 +339,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumInteger(@javax.annotation.Nullable EnumIntegerEnum enumInteger) {
     this.enumInteger = enumInteger;
@@ -356,7 +356,7 @@ public class EnumTest {
    * @return enumIntegerOnly
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumIntegerOnlyEnum getEnumIntegerOnly() {
@@ -364,7 +364,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_INTEGER_ONLY)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_INTEGER_ONLY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumIntegerOnly(@javax.annotation.Nullable EnumIntegerOnlyEnum enumIntegerOnly) {
     this.enumIntegerOnly = enumIntegerOnly;
@@ -381,7 +381,7 @@ public class EnumTest {
    * @return enumNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public EnumNumberEnum getEnumNumber() {
@@ -389,7 +389,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ENUM_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_ENUM_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEnumNumber(@javax.annotation.Nullable EnumNumberEnum enumNumber) {
     this.enumNumber = enumNumber;
@@ -412,7 +412,7 @@ public class EnumTest {
         return outerEnum.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OuterEnum> getOuterEnum_JsonNullable() {
@@ -439,7 +439,7 @@ public class EnumTest {
    * @return outerEnumInteger
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumInteger getOuterEnumInteger() {
@@ -447,7 +447,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
@@ -464,7 +464,7 @@ public class EnumTest {
    * @return outerEnumDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumDefaultValue getOuterEnumDefaultValue() {
@@ -472,7 +472,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumDefaultValue(@javax.annotation.Nullable OuterEnumDefaultValue outerEnumDefaultValue) {
     this.outerEnumDefaultValue = outerEnumDefaultValue;
@@ -489,7 +489,7 @@ public class EnumTest {
    * @return outerEnumIntegerDefaultValue
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OuterEnumIntegerDefaultValue getOuterEnumIntegerDefaultValue() {
@@ -497,7 +497,7 @@ public class EnumTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE)
+  @JsonProperty(value = JSON_PROPERTY_OUTER_ENUM_INTEGER_DEFAULT_VALUE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setOuterEnumIntegerDefaultValue(@javax.annotation.Nullable OuterEnumIntegerDefaultValue outerEnumIntegerDefaultValue) {
     this.outerEnumIntegerDefaultValue = outerEnumIntegerDefaultValue;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
index 1c08de91491..f4a7b183144 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/EquilateralTriangle.java
@@ -63,7 +63,7 @@ public class EquilateralTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -71,7 +71,7 @@ public class EquilateralTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -88,7 +88,7 @@ public class EquilateralTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -96,7 +96,7 @@ public class EquilateralTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
index e720ea817c3..e35def38091 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java
@@ -62,7 +62,7 @@ public class FileSchemaTestClass {
    * @return _file
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public ModelFile getFile() {
@@ -70,7 +70,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILE)
+  @JsonProperty(value = JSON_PROPERTY_FILE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFile(@javax.annotation.Nullable ModelFile _file) {
     this._file = _file;
@@ -95,7 +95,7 @@ public class FileSchemaTestClass {
    * @return files
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<ModelFile> getFiles() {
@@ -103,7 +103,7 @@ public class FileSchemaTestClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FILES)
+  @JsonProperty(value = JSON_PROPERTY_FILES, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFiles(@javax.annotation.Nullable List<ModelFile> files) {
     this.files = files;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
index fe433b59b12..f6e45324298 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Foo.java
@@ -54,7 +54,7 @@ public class Foo {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -62,7 +62,7 @@ public class Foo {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBar(@javax.annotation.Nullable String bar) {
     this.bar = bar;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
index 1bb9db7f356..c53d70f0c54 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FooGetDefaultResponse.java
@@ -56,7 +56,7 @@ public class FooGetDefaultResponse {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Foo getString() {
@@ -64,7 +64,7 @@ public class FooGetDefaultResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable Foo string) {
     this.string = string;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
index a915028fb53..f2da3986565 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/FormatTest.java
@@ -137,7 +137,7 @@ public class FormatTest {
    * @return integer
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInteger() {
@@ -145,7 +145,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INTEGER)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInteger(@javax.annotation.Nullable Integer integer) {
     this.integer = integer;
@@ -164,7 +164,7 @@ public class FormatTest {
    * @return int32
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getInt32() {
@@ -172,7 +172,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT32)
+  @JsonProperty(value = JSON_PROPERTY_INT32, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt32(@javax.annotation.Nullable Integer int32) {
     this.int32 = int32;
@@ -189,7 +189,7 @@ public class FormatTest {
    * @return int64
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getInt64() {
@@ -197,7 +197,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INT64)
+  @JsonProperty(value = JSON_PROPERTY_INT64, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setInt64(@javax.annotation.Nullable Long int64) {
     this.int64 = int64;
@@ -216,7 +216,7 @@ public class FormatTest {
    * @return number
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public BigDecimal getNumber() {
@@ -224,7 +224,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setNumber(@javax.annotation.Nonnull BigDecimal number) {
     this.number = number;
@@ -243,7 +243,7 @@ public class FormatTest {
    * @return _float
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Float getFloat() {
@@ -251,7 +251,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FLOAT)
+  @JsonProperty(value = JSON_PROPERTY_FLOAT, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFloat(@javax.annotation.Nullable Float _float) {
     this._float = _float;
@@ -270,7 +270,7 @@ public class FormatTest {
    * @return _double
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Double getDouble() {
@@ -278,7 +278,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DOUBLE)
+  @JsonProperty(value = JSON_PROPERTY_DOUBLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDouble(@javax.annotation.Nullable Double _double) {
     this._double = _double;
@@ -295,7 +295,7 @@ public class FormatTest {
    * @return decimal
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getDecimal() {
@@ -303,7 +303,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DECIMAL)
+  @JsonProperty(value = JSON_PROPERTY_DECIMAL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDecimal(@javax.annotation.Nullable BigDecimal decimal) {
     this.decimal = decimal;
@@ -320,7 +320,7 @@ public class FormatTest {
    * @return string
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getString() {
@@ -328,7 +328,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setString(@javax.annotation.Nullable String string) {
     this.string = string;
@@ -345,7 +345,7 @@ public class FormatTest {
    * @return _byte
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public byte[] getByte() {
@@ -353,7 +353,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BYTE)
+  @JsonProperty(value = JSON_PROPERTY_BYTE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setByte(@javax.annotation.Nonnull byte[] _byte) {
     this._byte = _byte;
@@ -370,7 +370,7 @@ public class FormatTest {
    * @return binary
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public File getBinary() {
@@ -378,7 +378,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BINARY)
+  @JsonProperty(value = JSON_PROPERTY_BINARY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBinary(@javax.annotation.Nullable File binary) {
     this.binary = binary;
@@ -395,7 +395,7 @@ public class FormatTest {
    * @return date
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public LocalDate getDate() {
@@ -403,7 +403,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE)
+  @JsonProperty(value = JSON_PROPERTY_DATE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setDate(@javax.annotation.Nonnull LocalDate date) {
     this.date = date;
@@ -420,7 +420,7 @@ public class FormatTest {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -428,7 +428,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -445,7 +445,7 @@ public class FormatTest {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -453,7 +453,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -470,7 +470,7 @@ public class FormatTest {
    * @return password
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPassword() {
@@ -478,7 +478,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPassword(@javax.annotation.Nonnull String password) {
     this.password = password;
@@ -495,7 +495,7 @@ public class FormatTest {
    * @return patternWithDigits
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigits() {
@@ -503,7 +503,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigits(@javax.annotation.Nullable String patternWithDigits) {
     this.patternWithDigits = patternWithDigits;
@@ -520,7 +520,7 @@ public class FormatTest {
    * @return patternWithDigitsAndDelimiter
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPatternWithDigitsAndDelimiter() {
@@ -528,7 +528,7 @@ public class FormatTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER)
+  @JsonProperty(value = JSON_PROPERTY_PATTERN_WITH_DIGITS_AND_DELIMITER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPatternWithDigitsAndDelimiter(@javax.annotation.Nullable String patternWithDigitsAndDelimiter) {
     this.patternWithDigitsAndDelimiter = patternWithDigitsAndDelimiter;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
index f555046df23..b6828dc3245 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/GrandparentAnimal.java
@@ -67,7 +67,7 @@ public class GrandparentAnimal {
    * @return petType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getPetType() {
@@ -75,7 +75,7 @@ public class GrandparentAnimal {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_PET_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPetType(@javax.annotation.Nonnull String petType) {
     this.petType = petType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
index 759eddd3e5b..105096f2f67 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HasOnlyReadOnly.java
@@ -65,7 +65,7 @@ public class HasOnlyReadOnly {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -80,7 +80,7 @@ public class HasOnlyReadOnly {
    * @return foo
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FOO)
+  @JsonProperty(value = JSON_PROPERTY_FOO, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFoo() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
index 6e2bb5db882..2b8b4612119 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/HealthCheckResult.java
@@ -63,7 +63,7 @@ public class HealthCheckResult {
         return nullableMessage.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NULLABLE_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_NULLABLE_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getNullableMessage_JsonNullable() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
index 95154b00324..abb01af7009 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/IsoscelesTriangle.java
@@ -59,7 +59,7 @@ public class IsoscelesTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -67,7 +67,7 @@ public class IsoscelesTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -84,7 +84,7 @@ public class IsoscelesTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -92,7 +92,7 @@ public class IsoscelesTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
index c3eb3a90c02..c9c8cfb4301 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MapTest.java
@@ -114,7 +114,7 @@ public class MapTest {
    * @return mapMapOfString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Map<String, String>> getMapMapOfString() {
@@ -122,7 +122,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_MAP_OF_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_MAP_OF_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapMapOfString(@javax.annotation.Nullable Map<String, Map<String, String>> mapMapOfString) {
     this.mapMapOfString = mapMapOfString;
@@ -147,7 +147,7 @@ public class MapTest {
    * @return mapOfEnumString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, InnerEnum> getMapOfEnumString() {
@@ -155,7 +155,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP_OF_ENUM_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MAP_OF_ENUM_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMapOfEnumString(@javax.annotation.Nullable Map<String, InnerEnum> mapOfEnumString) {
     this.mapOfEnumString = mapOfEnumString;
@@ -180,7 +180,7 @@ public class MapTest {
    * @return directMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getDirectMap() {
@@ -188,7 +188,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_DIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDirectMap(@javax.annotation.Nullable Map<String, Boolean> directMap) {
     this.directMap = directMap;
@@ -213,7 +213,7 @@ public class MapTest {
    * @return indirectMap
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Boolean> getIndirectMap() {
@@ -221,7 +221,7 @@ public class MapTest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_INDIRECT_MAP)
+  @JsonProperty(value = JSON_PROPERTY_INDIRECT_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setIndirectMap(@javax.annotation.Nullable Map<String, Boolean> indirectMap) {
     this.indirectMap = indirectMap;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 7d00e09f726..466ecb367e5 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -69,7 +69,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public UUID getUuid() {
@@ -77,7 +77,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable UUID uuid) {
     this.uuid = uuid;
@@ -94,7 +94,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return dateTime
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getDateTime() {
@@ -102,7 +102,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_DATE_TIME)
+  @JsonProperty(value = JSON_PROPERTY_DATE_TIME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDateTime(@javax.annotation.Nullable OffsetDateTime dateTime) {
     this.dateTime = dateTime;
@@ -127,7 +127,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
    * @return map
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Animal> getMap() {
@@ -135,7 +135,7 @@ public class MixedPropertiesAndAdditionalPropertiesClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MAP)
+  @JsonProperty(value = JSON_PROPERTY_MAP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMap(@javax.annotation.Nullable Map<String, Animal> map) {
     this.map = map;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
index 689215b2f3d..092573737fe 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Model200Response.java
@@ -60,7 +60,7 @@ public class Model200Response {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getName() {
@@ -68,7 +68,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable Integer name) {
     this.name = name;
@@ -85,7 +85,7 @@ public class Model200Response {
    * @return propertyClass
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPropertyClass() {
@@ -93,7 +93,7 @@ public class Model200Response {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY_CLASS)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY_CLASS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPropertyClass(@javax.annotation.Nullable String propertyClass) {
     this.propertyClass = propertyClass;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
index fe01dd7efc5..4d09cf9cb26 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelApiResponse.java
@@ -65,7 +65,7 @@ public class ModelApiResponse {
    * @return code
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getCode() {
@@ -73,7 +73,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(@javax.annotation.Nullable Integer code) {
     this.code = code;
@@ -90,7 +90,7 @@ public class ModelApiResponse {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getType() {
@@ -98,7 +98,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable String type) {
     this.type = type;
@@ -115,7 +115,7 @@ public class ModelApiResponse {
    * @return message
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMessage() {
@@ -123,7 +123,7 @@ public class ModelApiResponse {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(@javax.annotation.Nullable String message) {
     this.message = message;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
index 9c3fd6cecbb..2b38ff10178 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelFile.java
@@ -55,7 +55,7 @@ public class ModelFile {
    * @return sourceURI
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSourceURI() {
@@ -63,7 +63,7 @@ public class ModelFile {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOURCE_U_R_I)
+  @JsonProperty(value = JSON_PROPERTY_SOURCE_U_R_I, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSourceURI(@javax.annotation.Nullable String sourceURI) {
     this.sourceURI = sourceURI;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
index 0ac81084e1e..1f1be589b16 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelList.java
@@ -55,7 +55,7 @@ public class ModelList {
    * @return _123list
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String get123list() {
@@ -63,7 +63,7 @@ public class ModelList {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_123LIST)
+  @JsonProperty(value = JSON_PROPERTY_123LIST, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set123list(@javax.annotation.Nullable String _123list) {
     this._123list = _123list;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
index ffba75a639f..675a9b3f957 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ModelReturn.java
@@ -55,7 +55,7 @@ public class ModelReturn {
    * @return _return
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getReturn() {
@@ -63,7 +63,7 @@ public class ModelReturn {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_RETURN)
+  @JsonProperty(value = JSON_PROPERTY_RETURN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReturn(@javax.annotation.Nullable Integer _return) {
     this._return = _return;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
index 1931fa74d7a..5bd8e203d64 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Name.java
@@ -79,7 +79,7 @@ public class Name {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public Integer getName() {
@@ -87,7 +87,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull Integer name) {
     this.name = name;
@@ -99,7 +99,7 @@ public class Name {
    * @return snakeCase
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SNAKE_CASE)
+  @JsonProperty(value = JSON_PROPERTY_SNAKE_CASE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getSnakeCase() {
@@ -119,7 +119,7 @@ public class Name {
    * @return property
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getProperty() {
@@ -127,7 +127,7 @@ public class Name {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setProperty(@javax.annotation.Nullable String property) {
     this.property = property;
@@ -139,7 +139,7 @@ public class Name {
    * @return _123number
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_123NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_123NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer get123number() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
index c0be1e095cc..17aabaaee1e 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NullableClass.java
@@ -120,7 +120,7 @@ public class NullableClass {
         return integerProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_INTEGER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_INTEGER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Integer> getIntegerProp_JsonNullable() {
@@ -153,7 +153,7 @@ public class NullableClass {
         return numberProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_NUMBER_PROP)
+  @JsonProperty(value = JSON_PROPERTY_NUMBER_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<BigDecimal> getNumberProp_JsonNullable() {
@@ -186,7 +186,7 @@ public class NullableClass {
         return booleanProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_BOOLEAN_PROP)
+  @JsonProperty(value = JSON_PROPERTY_BOOLEAN_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Boolean> getBooleanProp_JsonNullable() {
@@ -219,7 +219,7 @@ public class NullableClass {
         return stringProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_STRING_PROP)
+  @JsonProperty(value = JSON_PROPERTY_STRING_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<String> getStringProp_JsonNullable() {
@@ -252,7 +252,7 @@ public class NullableClass {
         return dateProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<LocalDate> getDateProp_JsonNullable() {
@@ -285,7 +285,7 @@ public class NullableClass {
         return datetimeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_DATETIME_PROP)
+  @JsonProperty(value = JSON_PROPERTY_DATETIME_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<OffsetDateTime> getDatetimeProp_JsonNullable() {
@@ -330,7 +330,7 @@ public class NullableClass {
         return arrayNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayNullableProp_JsonNullable() {
@@ -375,7 +375,7 @@ public class NullableClass {
         return arrayAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<List<Object>> getArrayAndItemsNullableProp_JsonNullable() {
@@ -410,7 +410,7 @@ public class NullableClass {
    * @return arrayItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Object> getArrayItemsNullable() {
@@ -418,7 +418,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ARRAY_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ARRAY_ITEMS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setArrayItemsNullable(@javax.annotation.Nullable List<Object> arrayItemsNullable) {
     this.arrayItemsNullable = arrayItemsNullable;
@@ -453,7 +453,7 @@ public class NullableClass {
         return objectNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_NULLABLE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectNullableProp_JsonNullable() {
@@ -498,7 +498,7 @@ public class NullableClass {
         return objectAndItemsNullableProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_AND_ITEMS_NULLABLE_PROP, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Map<String, Object>> getObjectAndItemsNullableProp_JsonNullable() {
@@ -533,7 +533,7 @@ public class NullableClass {
    * @return objectItemsNullable
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
 
   public Map<String, Object> getObjectItemsNullable() {
@@ -541,7 +541,7 @@ public class NullableClass {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_ITEMS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_ITEMS_NULLABLE, required = false)
   @JsonInclude(content = JsonInclude.Include.ALWAYS, value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectItemsNullable(@javax.annotation.Nullable Map<String, Object> objectItemsNullable) {
     this.objectItemsNullable = objectItemsNullable;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
index 2c01d975939..cb277085d4d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/NumberOnly.java
@@ -55,7 +55,7 @@ public class NumberOnly {
    * @return justNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getJustNumber() {
@@ -63,7 +63,7 @@ public class NumberOnly {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_JUST_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_JUST_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setJustNumber(@javax.annotation.Nullable BigDecimal justNumber) {
     this.justNumber = justNumber;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
index eb32f3d3407..19fb8b5c03d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ObjectWithDeprecatedFields.java
@@ -76,7 +76,7 @@ public class ObjectWithDeprecatedFields {
    * @return uuid
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUuid() {
@@ -84,7 +84,7 @@ public class ObjectWithDeprecatedFields {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_UUID)
+  @JsonProperty(value = JSON_PROPERTY_UUID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUuid(@javax.annotation.Nullable String uuid) {
     this.uuid = uuid;
@@ -104,7 +104,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getId() {
@@ -113,7 +113,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable BigDecimal id) {
     this.id = id;
@@ -133,7 +133,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public DeprecatedObject getDeprecatedRef() {
@@ -142,7 +142,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_DEPRECATED_REF)
+  @JsonProperty(value = JSON_PROPERTY_DEPRECATED_REF, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDeprecatedRef(@javax.annotation.Nullable DeprecatedObject deprecatedRef) {
     this.deprecatedRef = deprecatedRef;
@@ -170,7 +170,7 @@ public class ObjectWithDeprecatedFields {
    */
   @Deprecated
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<String> getBars() {
@@ -179,7 +179,7 @@ public class ObjectWithDeprecatedFields {
 
 
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_BARS)
+  @JsonProperty(value = JSON_PROPERTY_BARS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBars(@javax.annotation.Nullable List<String> bars) {
     this.bars = bars;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
index 1c4e36d89d1..afac53c8baf 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Order.java
@@ -117,7 +117,7 @@ public class Order {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -125,7 +125,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -142,7 +142,7 @@ public class Order {
    * @return petId
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getPetId() {
@@ -150,7 +150,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(@javax.annotation.Nullable Long petId) {
     this.petId = petId;
@@ -167,7 +167,7 @@ public class Order {
    * @return quantity
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getQuantity() {
@@ -175,7 +175,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(@javax.annotation.Nullable Integer quantity) {
     this.quantity = quantity;
@@ -192,7 +192,7 @@ public class Order {
    * @return shipDate
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public OffsetDateTime getShipDate() {
@@ -200,7 +200,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(@javax.annotation.Nullable OffsetDateTime shipDate) {
     this.shipDate = shipDate;
@@ -217,7 +217,7 @@ public class Order {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -225,7 +225,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
@@ -242,7 +242,7 @@ public class Order {
    * @return complete
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getComplete() {
@@ -250,7 +250,7 @@ public class Order {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(@javax.annotation.Nullable Boolean complete) {
     this.complete = complete;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
index 692fd9a0cd1..0709a6d9bb9 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/OuterComposite.java
@@ -65,7 +65,7 @@ public class OuterComposite {
    * @return myNumber
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public BigDecimal getMyNumber() {
@@ -73,7 +73,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_NUMBER)
+  @JsonProperty(value = JSON_PROPERTY_MY_NUMBER, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyNumber(@javax.annotation.Nullable BigDecimal myNumber) {
     this.myNumber = myNumber;
@@ -90,7 +90,7 @@ public class OuterComposite {
    * @return myString
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getMyString() {
@@ -98,7 +98,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_STRING)
+  @JsonProperty(value = JSON_PROPERTY_MY_STRING, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyString(@javax.annotation.Nullable String myString) {
     this.myString = myString;
@@ -115,7 +115,7 @@ public class OuterComposite {
    * @return myBoolean
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getMyBoolean() {
@@ -123,7 +123,7 @@ public class OuterComposite {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_MY_BOOLEAN)
+  @JsonProperty(value = JSON_PROPERTY_MY_BOOLEAN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMyBoolean(@javax.annotation.Nullable Boolean myBoolean) {
     this.myBoolean = myBoolean;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
index 6c661d72b50..7b8deeda2b7 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java
@@ -120,7 +120,7 @@ public class Pet {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -128,7 +128,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -145,7 +145,7 @@ public class Pet {
    * @return category
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Category getCategory() {
@@ -153,7 +153,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(@javax.annotation.Nullable Category category) {
     this.category = category;
@@ -170,7 +170,7 @@ public class Pet {
    * @return name
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getName() {
@@ -178,7 +178,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(@javax.annotation.Nonnull String name) {
     this.name = name;
@@ -203,7 +203,7 @@ public class Pet {
    * @return photoUrls
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public List<String> getPhotoUrls() {
@@ -211,7 +211,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(@javax.annotation.Nonnull List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -236,7 +236,7 @@ public class Pet {
    * @return tags
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public List<Tag> getTags() {
@@ -244,7 +244,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(@javax.annotation.Nullable List<Tag> tags) {
     this.tags = tags;
@@ -261,7 +261,7 @@ public class Pet {
    * @return status
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public StatusEnum getStatus() {
@@ -269,7 +269,7 @@ public class Pet {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(@javax.annotation.Nullable StatusEnum status) {
     this.status = status;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
index 701bdd2d83b..bd05a6a2c36 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/QuadrilateralInterface.java
@@ -54,7 +54,7 @@ public class QuadrilateralInterface {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -62,7 +62,7 @@ public class QuadrilateralInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
index 0938d25d08f..c1f72a093c6 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
@@ -62,7 +62,7 @@ public class ReadOnlyFirst {
    * @return bar
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAR)
+  @JsonProperty(value = JSON_PROPERTY_BAR, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBar() {
@@ -82,7 +82,7 @@ public class ReadOnlyFirst {
    * @return baz
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getBaz() {
@@ -90,7 +90,7 @@ public class ReadOnlyFirst {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_BAZ)
+  @JsonProperty(value = JSON_PROPERTY_BAZ, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setBaz(@javax.annotation.Nullable String baz) {
     this.baz = baz;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
index 60f7aca7603..e0892a9dfbb 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ScaleneTriangle.java
@@ -63,7 +63,7 @@ public class ScaleneTriangle {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -71,7 +71,7 @@ public class ScaleneTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -88,7 +88,7 @@ public class ScaleneTriangle {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -96,7 +96,7 @@ public class ScaleneTriangle {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
index 25643d63a01..00fd96a2b90 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/ShapeInterface.java
@@ -54,7 +54,7 @@ public class ShapeInterface {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -62,7 +62,7 @@ public class ShapeInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
index 54ab913f16e..2bf8633963e 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SimpleQuadrilateral.java
@@ -63,7 +63,7 @@ public class SimpleQuadrilateral {
    * @return shapeType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getShapeType() {
@@ -71,7 +71,7 @@ public class SimpleQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SHAPE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_SHAPE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setShapeType(@javax.annotation.Nonnull String shapeType) {
     this.shapeType = shapeType;
@@ -88,7 +88,7 @@ public class SimpleQuadrilateral {
    * @return quadrilateralType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getQuadrilateralType() {
@@ -96,7 +96,7 @@ public class SimpleQuadrilateral {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_QUADRILATERAL_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_QUADRILATERAL_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setQuadrilateralType(@javax.annotation.Nonnull String quadrilateralType) {
     this.quadrilateralType = quadrilateralType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
index dbcd59298d0..84451301658 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/SpecialModelName.java
@@ -60,7 +60,7 @@ public class SpecialModelName {
    * @return $specialPropertyName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long get$SpecialPropertyName() {
@@ -68,7 +68,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_$_SPECIAL_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void set$SpecialPropertyName(@javax.annotation.Nullable Long $specialPropertyName) {
     this.$specialPropertyName = $specialPropertyName;
@@ -85,7 +85,7 @@ public class SpecialModelName {
    * @return specialModelName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSpecialModelName() {
@@ -93,7 +93,7 @@ public class SpecialModelName {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SPECIAL_MODEL_NAME)
+  @JsonProperty(value = JSON_PROPERTY_SPECIAL_MODEL_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSpecialModelName(@javax.annotation.Nullable String specialModelName) {
     this.specialModelName = specialModelName;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
index 52594c76570..10cd7471c4f 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Tag.java
@@ -59,7 +59,7 @@ public class Tag {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -67,7 +67,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -84,7 +84,7 @@ public class Tag {
    * @return name
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getName() {
@@ -92,7 +92,7 @@ public class Tag {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(@javax.annotation.Nullable String name) {
     this.name = name;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
index fd598046669..00ae87fcb64 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -59,7 +59,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
    * @return someProperty
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getSomeProperty() {
@@ -67,7 +67,7 @@ public class TestInlineFreeformAdditionalPropertiesRequest {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_SOME_PROPERTY)
+  @JsonProperty(value = JSON_PROPERTY_SOME_PROPERTY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setSomeProperty(@javax.annotation.Nullable String someProperty) {
     this.someProperty = someProperty;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
index 4ff30b356fd..af1cf1ca319 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/TriangleInterface.java
@@ -54,7 +54,7 @@ public class TriangleInterface {
    * @return triangleType
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getTriangleType() {
@@ -62,7 +62,7 @@ public class TriangleInterface {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TRIANGLE_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TRIANGLE_TYPE, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setTriangleType(@javax.annotation.Nonnull String triangleType) {
     this.triangleType = triangleType;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
index 11d7e35b474..5b2b42abd2b 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/User.java
@@ -110,7 +110,7 @@ public class User {
    * @return id
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Long getId() {
@@ -118,7 +118,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(@javax.annotation.Nullable Long id) {
     this.id = id;
@@ -135,7 +135,7 @@ public class User {
    * @return username
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getUsername() {
@@ -143,7 +143,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(@javax.annotation.Nullable String username) {
     this.username = username;
@@ -160,7 +160,7 @@ public class User {
    * @return firstName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getFirstName() {
@@ -168,7 +168,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(@javax.annotation.Nullable String firstName) {
     this.firstName = firstName;
@@ -185,7 +185,7 @@ public class User {
    * @return lastName
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getLastName() {
@@ -193,7 +193,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(@javax.annotation.Nullable String lastName) {
     this.lastName = lastName;
@@ -210,7 +210,7 @@ public class User {
    * @return email
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getEmail() {
@@ -218,7 +218,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(@javax.annotation.Nullable String email) {
     this.email = email;
@@ -235,7 +235,7 @@ public class User {
    * @return password
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPassword() {
@@ -243,7 +243,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(@javax.annotation.Nullable String password) {
     this.password = password;
@@ -260,7 +260,7 @@ public class User {
    * @return phone
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public String getPhone() {
@@ -268,7 +268,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(@javax.annotation.Nullable String phone) {
     this.phone = phone;
@@ -285,7 +285,7 @@ public class User {
    * @return userStatus
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Integer getUserStatus() {
@@ -293,7 +293,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(@javax.annotation.Nullable Integer userStatus) {
     this.userStatus = userStatus;
@@ -310,7 +310,7 @@ public class User {
    * @return objectWithNoDeclaredProps
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Object getObjectWithNoDeclaredProps() {
@@ -318,7 +318,7 @@ public class User {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setObjectWithNoDeclaredProps(@javax.annotation.Nullable Object objectWithNoDeclaredProps) {
     this.objectWithNoDeclaredProps = objectWithNoDeclaredProps;
@@ -341,7 +341,7 @@ public class User {
         return objectWithNoDeclaredPropsNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_OBJECT_WITH_NO_DECLARED_PROPS_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getObjectWithNoDeclaredPropsNullable_JsonNullable() {
@@ -374,7 +374,7 @@ public class User {
         return anyTypeProp.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypeProp_JsonNullable() {
@@ -407,7 +407,7 @@ public class User {
         return anyTypePropNullable.orElse(null);
   }
 
-  @JsonProperty(JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE)
+  @JsonProperty(value = JSON_PROPERTY_ANY_TYPE_PROP_NULLABLE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public JsonNullable<Object> getAnyTypePropNullable_JsonNullable() {
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
index c9026153aeb..92a72dbd138 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Whale.java
@@ -65,7 +65,7 @@ public class Whale {
    * @return hasBaleen
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasBaleen() {
@@ -73,7 +73,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_BALEEN)
+  @JsonProperty(value = JSON_PROPERTY_HAS_BALEEN, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasBaleen(@javax.annotation.Nullable Boolean hasBaleen) {
     this.hasBaleen = hasBaleen;
@@ -90,7 +90,7 @@ public class Whale {
    * @return hasTeeth
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public Boolean getHasTeeth() {
@@ -98,7 +98,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_HAS_TEETH)
+  @JsonProperty(value = JSON_PROPERTY_HAS_TEETH, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setHasTeeth(@javax.annotation.Nullable Boolean hasTeeth) {
     this.hasTeeth = hasTeeth;
@@ -115,7 +115,7 @@ public class Whale {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -123,7 +123,7 @@ public class Whale {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
index 840916fd1a3..fb56da18896 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Zebra.java
@@ -101,7 +101,7 @@ public class Zebra {
    * @return type
    */
   @javax.annotation.Nullable
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
   public TypeEnum getType() {
@@ -109,7 +109,7 @@ public class Zebra {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(@javax.annotation.Nullable TypeEnum type) {
     this.type = type;
@@ -126,7 +126,7 @@ public class Zebra {
    * @return className
    */
   @javax.annotation.Nonnull
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
 
   public String getClassName() {
@@ -134,7 +134,7 @@ public class Zebra {
   }
 
 
-  @JsonProperty(JSON_PROPERTY_CLASS_NAME)
+  @JsonProperty(value = JSON_PROPERTY_CLASS_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setClassName(@javax.annotation.Nonnull String className) {
     this.className = className;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
index 163f85e70df..ad1dda1ffc2 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Category.java
@@ -48,7 +48,7 @@ public class Category  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -57,7 +57,7 @@ public class Category  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -72,7 +72,7 @@ public class Category  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -81,7 +81,7 @@ public class Category  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
index 372b9293b83..125278c51ce 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/ModelApiResponse.java
@@ -54,7 +54,7 @@ public class ModelApiResponse  {
    * Get code
    * @return code
    **/
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getCode() {
     return code;
@@ -63,7 +63,7 @@ public class ModelApiResponse  {
   /**
    * Set code
    */
-  @JsonProperty(JSON_PROPERTY_CODE)
+  @JsonProperty(value = JSON_PROPERTY_CODE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCode(Integer code) {
     this.code = code;
@@ -78,7 +78,7 @@ public class ModelApiResponse  {
    * Get type
    * @return type
    **/
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getType() {
     return type;
@@ -87,7 +87,7 @@ public class ModelApiResponse  {
   /**
    * Set type
    */
-  @JsonProperty(JSON_PROPERTY_TYPE)
+  @JsonProperty(value = JSON_PROPERTY_TYPE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(String type) {
     this.type = type;
@@ -102,7 +102,7 @@ public class ModelApiResponse  {
    * Get message
    * @return message
    **/
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getMessage() {
     return message;
@@ -111,7 +111,7 @@ public class ModelApiResponse  {
   /**
    * Set message
    */
-  @JsonProperty(JSON_PROPERTY_MESSAGE)
+  @JsonProperty(value = JSON_PROPERTY_MESSAGE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setMessage(String message) {
     this.message = message;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
index 17713873ba0..bdd6ee370a0 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Order.java
@@ -104,7 +104,7 @@ public class Order  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -113,7 +113,7 @@ public class Order  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -128,7 +128,7 @@ public class Order  {
    * Get petId
    * @return petId
    **/
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getPetId() {
     return petId;
@@ -137,7 +137,7 @@ public class Order  {
   /**
    * Set petId
    */
-  @JsonProperty(JSON_PROPERTY_PET_ID)
+  @JsonProperty(value = JSON_PROPERTY_PET_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPetId(Long petId) {
     this.petId = petId;
@@ -152,7 +152,7 @@ public class Order  {
    * Get quantity
    * @return quantity
    **/
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getQuantity() {
     return quantity;
@@ -161,7 +161,7 @@ public class Order  {
   /**
    * Set quantity
    */
-  @JsonProperty(JSON_PROPERTY_QUANTITY)
+  @JsonProperty(value = JSON_PROPERTY_QUANTITY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setQuantity(Integer quantity) {
     this.quantity = quantity;
@@ -176,7 +176,7 @@ public class Order  {
    * Get shipDate
    * @return shipDate
    **/
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Date getShipDate() {
     return shipDate;
@@ -185,7 +185,7 @@ public class Order  {
   /**
    * Set shipDate
    */
-  @JsonProperty(JSON_PROPERTY_SHIP_DATE)
+  @JsonProperty(value = JSON_PROPERTY_SHIP_DATE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setShipDate(Date shipDate) {
     this.shipDate = shipDate;
@@ -200,7 +200,7 @@ public class Order  {
    * Order Status
    * @return status
    **/
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -209,7 +209,7 @@ public class Order  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
@@ -224,7 +224,7 @@ public class Order  {
    * Get complete
    * @return complete
    **/
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Boolean getComplete() {
     return complete;
@@ -233,7 +233,7 @@ public class Order  {
   /**
    * Set complete
    */
-  @JsonProperty(JSON_PROPERTY_COMPLETE)
+  @JsonProperty(value = JSON_PROPERTY_COMPLETE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setComplete(Boolean complete) {
     this.complete = complete;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
index 485b3a23b7a..ed5f6bf6c56 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Pet.java
@@ -108,7 +108,7 @@ public class Pet  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -117,7 +117,7 @@ public class Pet  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -132,7 +132,7 @@ public class Pet  {
    * Get category
    * @return category
    **/
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Category getCategory() {
     return category;
@@ -141,7 +141,7 @@ public class Pet  {
   /**
    * Set category
    */
-  @JsonProperty(JSON_PROPERTY_CATEGORY)
+  @JsonProperty(value = JSON_PROPERTY_CATEGORY, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCategory(Category category) {
     this.category = category;
@@ -156,7 +156,7 @@ public class Pet  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public String getName() {
     return name;
@@ -165,7 +165,7 @@ public class Pet  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setName(String name) {
     this.name = name;
@@ -180,7 +180,7 @@ public class Pet  {
    * Get photoUrls
    * @return photoUrls
    **/
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public List<String> getPhotoUrls() {
     return photoUrls;
@@ -189,7 +189,7 @@ public class Pet  {
   /**
    * Set photoUrls
    */
-  @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
+  @JsonProperty(value = JSON_PROPERTY_PHOTO_URLS, required = true)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(List<String> photoUrls) {
     this.photoUrls = photoUrls;
@@ -212,7 +212,7 @@ public class Pet  {
    * Get tags
    * @return tags
    **/
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public List<Tag> getTags() {
     return tags;
@@ -221,7 +221,7 @@ public class Pet  {
   /**
    * Set tags
    */
-  @JsonProperty(JSON_PROPERTY_TAGS)
+  @JsonProperty(value = JSON_PROPERTY_TAGS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setTags(List<Tag> tags) {
     this.tags = tags;
@@ -246,7 +246,7 @@ public class Pet  {
    * @deprecated
    **/
   @Deprecated
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public StatusEnum getStatus() {
     return status;
@@ -255,7 +255,7 @@ public class Pet  {
   /**
    * Set status
    */
-  @JsonProperty(JSON_PROPERTY_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
index da24f6b0b53..54aa5945d77 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/Tag.java
@@ -48,7 +48,7 @@ public class Tag  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -57,7 +57,7 @@ public class Tag  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -72,7 +72,7 @@ public class Tag  {
    * Get name
    * @return name
    **/
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getName() {
     return name;
@@ -81,7 +81,7 @@ public class Tag  {
   /**
    * Set name
    */
-  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonProperty(value = JSON_PROPERTY_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setName(String name) {
     this.name = name;
diff --git a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
index dfdd5a3f82c..d1359873cfc 100644
--- a/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
+++ b/samples/server/petstore/java-microprofile/src/main/java/org/openapitools/server/model/User.java
@@ -81,7 +81,7 @@ public class User  {
    * Get id
    * @return id
    **/
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Long getId() {
     return id;
@@ -90,7 +90,7 @@ public class User  {
   /**
    * Set id
    */
-  @JsonProperty(JSON_PROPERTY_ID)
+  @JsonProperty(value = JSON_PROPERTY_ID, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setId(Long id) {
     this.id = id;
@@ -105,7 +105,7 @@ public class User  {
    * Get username
    * @return username
    **/
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getUsername() {
     return username;
@@ -114,7 +114,7 @@ public class User  {
   /**
    * Set username
    */
-  @JsonProperty(JSON_PROPERTY_USERNAME)
+  @JsonProperty(value = JSON_PROPERTY_USERNAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUsername(String username) {
     this.username = username;
@@ -129,7 +129,7 @@ public class User  {
    * Get firstName
    * @return firstName
    **/
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getFirstName() {
     return firstName;
@@ -138,7 +138,7 @@ public class User  {
   /**
    * Set firstName
    */
-  @JsonProperty(JSON_PROPERTY_FIRST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_FIRST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFirstName(String firstName) {
     this.firstName = firstName;
@@ -153,7 +153,7 @@ public class User  {
    * Get lastName
    * @return lastName
    **/
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getLastName() {
     return lastName;
@@ -162,7 +162,7 @@ public class User  {
   /**
    * Set lastName
    */
-  @JsonProperty(JSON_PROPERTY_LAST_NAME)
+  @JsonProperty(value = JSON_PROPERTY_LAST_NAME, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setLastName(String lastName) {
     this.lastName = lastName;
@@ -177,7 +177,7 @@ public class User  {
    * Get email
    * @return email
    **/
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getEmail() {
     return email;
@@ -186,7 +186,7 @@ public class User  {
   /**
    * Set email
    */
-  @JsonProperty(JSON_PROPERTY_EMAIL)
+  @JsonProperty(value = JSON_PROPERTY_EMAIL, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setEmail(String email) {
     this.email = email;
@@ -201,7 +201,7 @@ public class User  {
    * Get password
    * @return password
    **/
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPassword() {
     return password;
@@ -210,7 +210,7 @@ public class User  {
   /**
    * Set password
    */
-  @JsonProperty(JSON_PROPERTY_PASSWORD)
+  @JsonProperty(value = JSON_PROPERTY_PASSWORD, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPassword(String password) {
     this.password = password;
@@ -225,7 +225,7 @@ public class User  {
    * Get phone
    * @return phone
    **/
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public String getPhone() {
     return phone;
@@ -234,7 +234,7 @@ public class User  {
   /**
    * Set phone
    */
-  @JsonProperty(JSON_PROPERTY_PHONE)
+  @JsonProperty(value = JSON_PROPERTY_PHONE, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPhone(String phone) {
     this.phone = phone;
@@ -249,7 +249,7 @@ public class User  {
    * User Status
    * @return userStatus
    **/
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public Integer getUserStatus() {
     return userStatus;
@@ -258,7 +258,7 @@ public class User  {
   /**
    * Set userStatus
    */
-  @JsonProperty(JSON_PROPERTY_USER_STATUS)
+  @JsonProperty(value = JSON_PROPERTY_USER_STATUS, required = false)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setUserStatus(Integer userStatus) {
     this.userStatus = userStatus;