diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/jersey2/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/jersey2/ApiClient.mustache
index 0f83a20450f..95fb8093bc3 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/jersey2/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/jersey2/ApiClient.mustache
@@ -573,7 +573,7 @@ public class ApiClient {
       entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE);
     } else {
       // We let jersey handle the serialization
-      entity = Entity.entity(obj, contentType);
+      entity = Entity.entity(obj == null ? Entity.text("") : obj, contentType);
     }
     return entity;
   }
@@ -732,7 +732,7 @@ public class ApiClient {
       }
     }
 
-    Entity<?> entity = (body == null) ? Entity.json("") : serialize(body, formParams, contentType);
+    Entity<?> entity = serialize(body, formParams, contentType);
 
     Response response = null;
 
diff --git a/samples/client/petstore/java/jersey2-java6/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/jersey2-java6/src/main/java/org/openapitools/client/ApiClient.java
index 7776f178e8e..35d6ae5c9af 100644
--- a/samples/client/petstore/java/jersey2-java6/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/jersey2-java6/src/main/java/org/openapitools/client/ApiClient.java
@@ -562,7 +562,7 @@ public class ApiClient {
       entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE);
     } else {
       // We let jersey handle the serialization
-      entity = Entity.entity(obj, contentType);
+      entity = Entity.entity(obj == null ? Entity.text("") : obj, contentType);
     }
     return entity;
   }
@@ -716,7 +716,7 @@ public class ApiClient {
       }
     }
 
-    Entity<?> entity = (body == null) ? Entity.json("") : serialize(body, formParams, contentType);
+    Entity<?> entity = serialize(body, formParams, contentType);
 
     Response response = null;
 
diff --git a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java
index a0aff556422..dcc41e43f5d 100644
--- a/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java
@@ -563,7 +563,7 @@ public class ApiClient {
       entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE);
     } else {
       // We let jersey handle the serialization
-      entity = Entity.entity(obj, contentType);
+      entity = Entity.entity(obj == null ? Entity.text("") : obj, contentType);
     }
     return entity;
   }
@@ -716,7 +716,7 @@ public class ApiClient {
       }
     }
 
-    Entity<?> entity = (body == null) ? Entity.json("") : serialize(body, formParams, contentType);
+    Entity<?> entity = serialize(body, formParams, contentType);
 
     Response response = null;
 
diff --git a/samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/ApiClient.java
index a0aff556422..dcc41e43f5d 100644
--- a/samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/ApiClient.java
@@ -563,7 +563,7 @@ public class ApiClient {
       entity = Entity.entity(form, MediaType.APPLICATION_FORM_URLENCODED_TYPE);
     } else {
       // We let jersey handle the serialization
-      entity = Entity.entity(obj, contentType);
+      entity = Entity.entity(obj == null ? Entity.text("") : obj, contentType);
     }
     return entity;
   }
@@ -716,7 +716,7 @@ public class ApiClient {
       }
     }
 
-    Entity<?> entity = (body == null) ? Entity.json("") : serialize(body, formParams, contentType);
+    Entity<?> entity = serialize(body, formParams, contentType);
 
     Response response = null;