fix #17258 - use model class only if it is generated (#17490)

* fix  #16797 and #15796 spring child constructor missing parent params

* root cause and update the DefaultCodegen.java to add missing property when with multi inheritance

* rollback SpringCodegen.java

* update samples

* rollback with master cause #16992 fixed this issue too

* still using orignal design

* catchup master

* catchup master

* catchup master

* fix

* add tests

---------

Co-authored-by: dabdirb <dabdirb@gmail.com>

samples/client/petstore/java/feign/src/main/java/org/openapitools/client/api/FakeApi.java

@@ -314,6 +314,33 @@ public interface FakeApi extends ApiClient.Api {
 
 
 
+  /**
+   * test referenced additionalProperties
+   * 
+   * @param requestBody request body (required)
+   */
+  @RequestLine("POST /fake/additionalProperties-reference")
+  @Headers({
+    "Content-Type: application/json",
+    "Accept: application/json",
+  })
+  void testAdditionalPropertiesReference(Map<String, Object> requestBody);
+
+  /**
+   * test referenced additionalProperties
+   * Similar to <code>testAdditionalPropertiesReference</code> but it also returns the http response headers .
+   * 
+   * @param requestBody request body (required)
+   */
+  @RequestLine("POST /fake/additionalProperties-reference")
+  @Headers({
+    "Content-Type: application/json",
+    "Accept: application/json",
+  })
+  ApiResponse<Void> testAdditionalPropertiesReferenceWithHttpInfo(Map<String, Object> requestBody);
+
+
+
   /**
    * 
    * For this test, the body has to be a binary file.