[Java] deserialize to LinkedHashSet when unique items (#10241)

* [Java] deserialize to LinkedHashSet when unique items

* [Java] fix deserialization of readonly properties

* [Java] deserialize to LinkedHashSet when unique items

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -507,6 +507,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         // optional jackson mappings for BigDecimal support
         importMapping.put("ToStringSerializer", "com.fasterxml.jackson.databind.ser.std.ToStringSerializer");
         importMapping.put("JsonSerialize", "com.fasterxml.jackson.databind.annotation.JsonSerialize");
+        importMapping.put("JsonDeserialize", "com.fasterxml.jackson.databind.annotation.JsonDeserialize");
 
         // imports for pojos
         importMapping.put("ApiModelProperty", "io.swagger.annotations.ApiModelProperty");
@@ -1227,6 +1228,8 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
                 model.imports.add("ArrayList");
             } else if ("set".equals(property.containerType)) {
                 model.imports.add("LinkedHashSet");
+                model.imports.add("JsonDeserialize");
+                property.vendorExtensions.put("x-setter-extra-annotation", "@JsonDeserialize(as = LinkedHashSet.class)");
             } else if ("map".equals(property.containerType)) {
                 model.imports.add("HashMap");
             }

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java

@@ -806,6 +806,12 @@ public class JavaClientCodegen extends AbstractJavaCodegen
             model.imports.remove("JsonSerialize");
             model.imports.remove("ToStringSerializer");
         }
+
+        if ("set".equals(property.containerType) && !JACKSON.equals(serializationLibrary)) {
+            // clean-up
+            model.imports.remove("JsonDeserialize");
+            property.vendorExtensions.remove("x-setter-extra-annotation");
+        }
     }
 
     @Override

modules/openapi-generator/src/main/resources/Java/libraries/jersey2/pojo.mustache

@@ -244,7 +244,8 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{/vendorExtensions.x-is-jackson-optional-nullable}}
 
   {{^isReadOnly}}
-{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+{{#vendorExtensions.x-setter-extra-annotation}}  {{{vendorExtensions.x-setter-extra-annotation}}}
+{{/vendorExtensions.x-setter-extra-annotation}}{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     {{#vendorExtensions.x-enum-as-string}}
     if (!{{{nameInSnakeCase}}}_VALUES.contains({{name}})) {
       throw new IllegalArgumentException({{name}} + " is invalid. Possible values for {{name}}: " + String.join(", ", {{{nameInSnakeCase}}}_VALUES));

modules/openapi-generator/src/main/resources/Java/libraries/microprofile/pojo.mustache

@@ -101,7 +101,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}}{{#serializableM
   /**
     * Set {{name}}
   **/
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}  {{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache

@@ -247,7 +247,8 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{/vendorExtensions.x-is-jackson-optional-nullable}}
 
   {{^isReadOnly}}
-{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+{{#vendorExtensions.x-setter-extra-annotation}}  {{{vendorExtensions.x-setter-extra-annotation}}}
+{{/vendorExtensions.x-setter-extra-annotation}}{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     {{#vendorExtensions.x-enum-as-string}}
     if (!{{{nameInSnakeCase}}}_VALUES.contains({{name}})) {
       throw new IllegalArgumentException({{name}} + " is invalid. Possible values for {{name}}: " + String.join(", ", {{{nameInSnakeCase}}}_VALUES));

modules/openapi-generator/src/main/resources/Java/pojo.mustache

@@ -230,7 +230,8 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{/vendorExtensions.x-is-jackson-optional-nullable}}
 
   {{^isReadOnly}}
-{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+{{#vendorExtensions.x-setter-extra-annotation}}  {{{vendorExtensions.x-setter-extra-annotation}}}
+{{/vendorExtensions.x-setter-extra-annotation}}{{#jackson}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{> jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     {{#vendorExtensions.x-is-jackson-optional-nullable}}
     this.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
     {{/vendorExtensions.x-is-jackson-optional-nullable}}

modules/openapi-generator/src/main/resources/JavaInflector/pojo.mustache

@@ -43,7 +43,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
   public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf-cdi/pojo.mustache

@@ -42,7 +42,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
 {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
   {{#isArray}}

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf-ext/pojo.mustache

@@ -88,7 +88,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}}{{#serializableM
    * <br><em>N.B. <code>{{name}}</code> is <b>read only</b>; client code should not call this method</em>.
 {{/isReadOnly}}
    */
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+ {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+ {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf/pojo.mustache

@@ -116,7 +116,8 @@ import com.fasterxml.jackson.annotation.JsonProperty;
   {{/vendorExtensions.x-is-jackson-optional-nullable}}
 
   {{^isReadOnly}}
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
   {{#vendorExtensions.x-is-jackson-optional-nullable}}
       this.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
   {{/vendorExtensions.x-is-jackson-optional-nullable}}

modules/openapi-generator/src/main/resources/JavaJaxRS/pojo.mustache

@@ -95,7 +95,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
     return {{name}};
   }
 
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaJaxRS/resteasy/eap/pojo.mustache

@@ -31,7 +31,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
 {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaJaxRS/resteasy/pojo.mustache

@@ -30,7 +30,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
 {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache

@@ -50,7 +50,8 @@ import com.fasterxml.jackson.annotation.JsonTypeName;
   }
 
   @JsonProperty("{{baseName}}")
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaPlayFramework/pojo.mustache

@@ -91,7 +91,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
     return {{name}};
   }
 
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache

@@ -117,7 +117,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}}{{^parent}}{{#ha
     return {{name}};
   }
 
-  public void {{setter}}({{>nullableDataType}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{>nullableDataType}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaVertXServer/pojo.mustache

@@ -23,7 +23,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
   public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/JavaVertXWebServer/pojo.mustache

@@ -23,7 +23,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
   public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/java-micronaut-client/model/pojo.mustache

@@ -199,7 +199,9 @@ Declare the class with extends and implements
         {{^isReadOnly}}
             {{#jackson}}
                 {{^vendorExtensions.x-is-jackson-optional-nullable}}
-{{>model/jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+{{>model/jackson_annotations}}{{/vendorExtensions.x-is-jackson-optional-nullable}}{{/jackson}}{{#vendorExtensions.x-setter-extra-annotation}}
+  {{{vendorExtensions.x-setter-extra-annotation}}}
+{{/vendorExtensions.x-setter-extra-annotation}}  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
             {{#vendorExtensions.x-is-jackson-optional-nullable}}
     this.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
             {{/vendorExtensions.x-is-jackson-optional-nullable}}

modules/openapi-generator/src/main/resources/java-msf4j-server/pojo.mustache

@@ -85,7 +85,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
   }
   {{^isReadOnly}}
 
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
   {{/isReadOnly}}

modules/openapi-generator/src/main/resources/java-pkmst/pojo.mustache

@@ -89,7 +89,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
     return {{name}};
   }
 
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

modules/openapi-generator/src/main/resources/java-undertow-server/pojo.mustache

@@ -25,7 +25,8 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#serializable
   public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
+  {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
     this.{{name}} = {{name}};
   }
 

samples/client/petstore/java-micronaut-client/src/main/java/org/openapitools/model/Pet.java

@@ -14,6 +14,7 @@ package org.openapitools.model;
 
 import java.util.Objects;
 import java.util.Arrays;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -190,6 +191,8 @@ public class Pet {
 
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
+
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/feign-no-nullable/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -208,6 +209,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/jersey1/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,6 +22,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -205,6 +206,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,6 +22,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -205,6 +206,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,6 +22,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -204,6 +205,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/native/src/main/java/org/openapitools/client/model/Pet.java

@@ -22,6 +22,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -204,6 +205,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -213,6 +214,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -239,6 +240,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   // items.xmlName=

samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -212,6 +213,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/vertx-no-nullable/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/model/Pet.java

@@ -20,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -207,6 +208,7 @@ public class Pet {
   }
 
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   @JsonProperty(JSON_PROPERTY_PHOTO_URLS)
   @JsonInclude(value = JsonInclude.Include.ALWAYS)
   public void setPhotoUrls(Set<String> photoUrls) {

samples/server/petstore/java-msf4j/src/gen/java/org/openapitools/model/Pet.java

@@ -4,6 +4,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -142,6 +143,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/java-play-framework-fake-endpoints/app/apimodels/Pet.java

@@ -2,6 +2,7 @@ package apimodels;
 
 import apimodels.Category;
 import apimodels.Tag;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -147,6 +148,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs-cxf/src/gen/java/org/openapitools/model/Pet.java

@@ -2,6 +2,7 @@ package org.openapitools.model;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -135,6 +136,7 @@ AVAILABLE(String.valueOf("available")), PENDING(String.valueOf("pending")), SOLD
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs-datelib-j8/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -181,6 +182,7 @@ public class Pet  implements Serializable {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs-jersey/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -180,6 +181,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Pet.java

@@ -1,5 +1,6 @@
 package org.openapitools.model;
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -146,6 +147,7 @@ public enum StatusEnum {
   }
 
   @JsonProperty("photoUrls")
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Pet.java

@@ -1,5 +1,6 @@
 package org.openapitools.model;
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -146,6 +147,7 @@ public enum StatusEnum {
   }
 
   @JsonProperty("photoUrls")
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs/jersey1-useTags/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -180,6 +181,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs/jersey1/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -180,6 +181,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs/jersey2-useTags/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -180,6 +181,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/jaxrs/jersey2/src/gen/java/org/openapitools/model/Pet.java

@@ -17,6 +17,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -180,6 +181,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/spring-mvc-no-nullable/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -169,6 +170,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -170,6 +171,7 @@ public enum StatusEnum {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-beanvalidation-no-nullable/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -168,6 +169,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }

samples/server/petstore/springboot/src/main/java/org/openapitools/model/Pet.java

@@ -5,6 +5,7 @@ import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
@@ -167,6 +168,7 @@ public class Pet   {
     return photoUrls;
   }
 
+  @JsonDeserialize(as = LinkedHashSet.class)
   public void setPhotoUrls(Set<String> photoUrls) {
     this.photoUrls = photoUrls;
   }