diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.gradle.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.gradle.mustache
index 7e3d97298ea9..f6002e0ef9e7 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.gradle.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.gradle.mustache
@@ -108,6 +108,9 @@ dependencies {
     implementation 'com.squareup.okhttp3:logging-interceptor:4.9.1'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'io.gsonfire:gson-fire:1.8.4'
+    {{#openApiNullable}}
+    implementation 'org.openapitools:jackson-databind-nullable:0.2.1'
+    {{/openApiNullable}}    
     {{#hasOAuthMethods}}
     implementation group: 'org.apache.oltu.oauth2', name: 'org.apache.oltu.oauth2.client', version: '1.0.1'
     {{/hasOAuthMethods}}
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.sbt.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.sbt.mustache
index 8979b10a7f8c..ccab8251805b 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.sbt.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.sbt.mustache
@@ -14,6 +14,9 @@ lazy val root = (project in file(".")).
       "com.squareup.okhttp3" % "logging-interceptor" % "4.9.1",
       "com.google.code.gson" % "gson" % "2.8.6",
       "org.apache.commons" % "commons-lang3" % "3.10",
+      {{#openApiNullable}}
+      "org.openapitools" % "jackson-databind-nullable" % "0.2.1",
+      {{/openApiNullable}}
       {{#hasOAuthMethods}}
       "org.apache.oltu.oauth2" % "org.apache.oltu.oauth2.client" % "1.0.1",
       {{/hasOAuthMethods}}
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/pom.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/pom.mustache
index 74a1b796dcde..38596f5369e9 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/pom.mustache
@@ -318,6 +318,13 @@
             <version>${javax-annotation-version}</version>
             <scope>provided</scope>
         </dependency>
+        {{#openApiNullable}}
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>${jackson-databind-nullable-version}</version>
+        </dependency>
+        {{/openApiNullable}}
         <!-- test dependencies -->
         <dependency>
             <groupId>junit</groupId>
@@ -335,6 +342,9 @@
         <okhttp-version>4.9.1</okhttp-version>
         <gson-version>2.8.6</gson-version>
         <commons-lang3-version>3.11</commons-lang3-version>
+        {{#openApiNullable}}
+        <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
+        {{/openApiNullable}}
         {{#joda}}
         <jodatime-version>2.10.9</jodatime-version>
         {{/joda}}
diff --git a/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.gradle b/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.gradle
index 9daaafc56616..e5d608265dee 100644
--- a/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.gradle
+++ b/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.gradle
@@ -104,6 +104,7 @@ dependencies {
     implementation 'com.squareup.okhttp3:logging-interceptor:4.9.1'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'io.gsonfire:gson-fire:1.8.4'
+    implementation 'org.openapitools:jackson-databind-nullable:0.2.1'
     implementation group: 'org.apache.oltu.oauth2', name: 'org.apache.oltu.oauth2.client', version: '1.0.1'
     implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.10'
     implementation 'org.threeten:threetenbp:1.4.3'
diff --git a/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.sbt b/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.sbt
index 020460f4527d..96c44f5d7de0 100644
--- a/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.sbt
+++ b/samples/client/petstore/java/okhttp-gson-dynamicOperations/build.sbt
@@ -14,6 +14,7 @@ lazy val root = (project in file(".")).
       "com.squareup.okhttp3" % "logging-interceptor" % "4.9.1",
       "com.google.code.gson" % "gson" % "2.8.6",
       "org.apache.commons" % "commons-lang3" % "3.10",
+      "org.openapitools" % "jackson-databind-nullable" % "0.2.1",
       "org.apache.oltu.oauth2" % "org.apache.oltu.oauth2.client" % "1.0.1",
       "org.threeten" % "threetenbp" % "1.4.3" % "compile",
       "io.swagger.parser.v3" % "swagger-parser-v3" "2.0.23" % "compile"
diff --git a/samples/client/petstore/java/okhttp-gson-dynamicOperations/pom.xml b/samples/client/petstore/java/okhttp-gson-dynamicOperations/pom.xml
index 942da2a74f05..656360eff393 100644
--- a/samples/client/petstore/java/okhttp-gson-dynamicOperations/pom.xml
+++ b/samples/client/petstore/java/okhttp-gson-dynamicOperations/pom.xml
@@ -267,6 +267,11 @@
             <version>${javax-annotation-version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>${jackson-databind-nullable-version}</version>
+        </dependency>
         <!-- test dependencies -->
         <dependency>
             <groupId>junit</groupId>
@@ -284,6 +289,7 @@
         <okhttp-version>4.9.1</okhttp-version>
         <gson-version>2.8.6</gson-version>
         <commons-lang3-version>3.11</commons-lang3-version>
+        <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
         <threetenbp-version>1.5.0</threetenbp-version>
         <javax-annotation-version>1.3.2</javax-annotation-version>
         <junit-version>4.13.1</junit-version>
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/build.gradle b/samples/client/petstore/java/okhttp-gson-parcelableModel/build.gradle
index 5809e790fce1..157cb472fc0e 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/build.gradle
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/build.gradle
@@ -104,6 +104,7 @@ dependencies {
     implementation 'com.squareup.okhttp3:logging-interceptor:4.9.1'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'io.gsonfire:gson-fire:1.8.4'
+    implementation 'org.openapitools:jackson-databind-nullable:0.2.1'
     implementation group: 'org.apache.oltu.oauth2', name: 'org.apache.oltu.oauth2.client', version: '1.0.1'
     implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.10'
     implementation 'org.threeten:threetenbp:1.4.3'
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/build.sbt b/samples/client/petstore/java/okhttp-gson-parcelableModel/build.sbt
index c36bbc5ca081..89da006858cc 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/build.sbt
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/build.sbt
@@ -14,6 +14,7 @@ lazy val root = (project in file(".")).
       "com.squareup.okhttp3" % "logging-interceptor" % "4.9.1",
       "com.google.code.gson" % "gson" % "2.8.6",
       "org.apache.commons" % "commons-lang3" % "3.10",
+      "org.openapitools" % "jackson-databind-nullable" % "0.2.1",
       "org.apache.oltu.oauth2" % "org.apache.oltu.oauth2.client" % "1.0.1",
       "org.threeten" % "threetenbp" % "1.4.3" % "compile",
       "io.gsonfire" % "gson-fire" % "1.8.3" % "compile",
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/pom.xml b/samples/client/petstore/java/okhttp-gson-parcelableModel/pom.xml
index a2bb80af7fae..6761db7d59df 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/pom.xml
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/pom.xml
@@ -269,6 +269,11 @@
             <version>${javax-annotation-version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>${jackson-databind-nullable-version}</version>
+        </dependency>
         <!-- test dependencies -->
         <dependency>
             <groupId>junit</groupId>
@@ -286,6 +291,7 @@
         <okhttp-version>4.9.1</okhttp-version>
         <gson-version>2.8.6</gson-version>
         <commons-lang3-version>3.11</commons-lang3-version>
+        <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
         <threetenbp-version>1.5.0</threetenbp-version>
         <javax-annotation-version>1.3.2</javax-annotation-version>
         <junit-version>4.13.1</junit-version>
diff --git a/samples/client/petstore/java/okhttp-gson/build.gradle b/samples/client/petstore/java/okhttp-gson/build.gradle
index 3488028c4669..bfa3f2098309 100644
--- a/samples/client/petstore/java/okhttp-gson/build.gradle
+++ b/samples/client/petstore/java/okhttp-gson/build.gradle
@@ -104,6 +104,7 @@ dependencies {
     implementation 'com.squareup.okhttp3:logging-interceptor:4.9.1'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'io.gsonfire:gson-fire:1.8.4'
+    implementation 'org.openapitools:jackson-databind-nullable:0.2.1'
     implementation group: 'org.apache.oltu.oauth2', name: 'org.apache.oltu.oauth2.client', version: '1.0.1'
     implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.10'
     implementation 'org.threeten:threetenbp:1.4.3'
diff --git a/samples/client/petstore/java/okhttp-gson/build.sbt b/samples/client/petstore/java/okhttp-gson/build.sbt
index 6dfd0d7f733b..5b476bc7d120 100644
--- a/samples/client/petstore/java/okhttp-gson/build.sbt
+++ b/samples/client/petstore/java/okhttp-gson/build.sbt
@@ -14,6 +14,7 @@ lazy val root = (project in file(".")).
       "com.squareup.okhttp3" % "logging-interceptor" % "4.9.1",
       "com.google.code.gson" % "gson" % "2.8.6",
       "org.apache.commons" % "commons-lang3" % "3.10",
+      "org.openapitools" % "jackson-databind-nullable" % "0.2.1",
       "org.apache.oltu.oauth2" % "org.apache.oltu.oauth2.client" % "1.0.1",
       "org.threeten" % "threetenbp" % "1.4.3" % "compile",
       "io.gsonfire" % "gson-fire" % "1.8.3" % "compile",
diff --git a/samples/client/petstore/java/okhttp-gson/pom.xml b/samples/client/petstore/java/okhttp-gson/pom.xml
index bdd59dd9f378..54685657f877 100644
--- a/samples/client/petstore/java/okhttp-gson/pom.xml
+++ b/samples/client/petstore/java/okhttp-gson/pom.xml
@@ -262,6 +262,11 @@
             <version>${javax-annotation-version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>${jackson-databind-nullable-version}</version>
+        </dependency>
         <!-- test dependencies -->
         <dependency>
             <groupId>junit</groupId>
@@ -279,6 +284,7 @@
         <okhttp-version>4.9.1</okhttp-version>
         <gson-version>2.8.6</gson-version>
         <commons-lang3-version>3.11</commons-lang3-version>
+        <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
         <threetenbp-version>1.5.0</threetenbp-version>
         <javax-annotation-version>1.3.2</javax-annotation-version>
         <junit-version>4.13.1</junit-version>