skip discriminator property assignment for enums.

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -3271,6 +3271,10 @@ private void addVars(CodegenModel m, List<CodegenProperty> vars, Map<String, Pro
                     // FIXME: readWriteVars can contain duplicated properties. Debug/breakpoint here while running C# generator (Dog and Cat models)
                     m.readWriteVars.add(cp);
                 }
+
+                if (m.discriminator != null && cp.name.equals(m.discriminator) && cp.isEnum) {
+                    m.vendorExtensions.put("x-discriminator-is-enum", true);
+                }
             }
         }
     }

modules/swagger-codegen/src/main/resources/Java/pojo.mustache

@@ -74,17 +74,21 @@ public class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{{#parcela
   {{/parent}}
   {{#gson}}
   {{#discriminator}}
+  {{^vendorExtensions.x-discriminator-is-enum}}
     this.{{discriminatorClassVarName}} = this.getClass().getSimpleName();
+  {{/vendorExtensions.x-discriminator-is-enum}}
   {{/discriminator}}
   {{/gson}}
   }
   {{/parcelableModel}}
   {{^parcelableModel}}
   {{#gson}}
   {{#discriminator}}
+  {{^vendorExtensions.x-discriminator-is-enum}}
   public {{classname}}() {
     this.{{discriminatorClassVarName}} = this.getClass().getSimpleName();
   }
+  {{/vendorExtensions.x-discriminator-is-enum}}
   {{/discriminator}}
   {{/gson}}
   {{/parcelableModel}}