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/resttemplate-withXml/README.md

@@ -123,6 +123,7 @@ Class | Method | HTTP request | Description
 *FakeApi* | [**fakeOuterNumberSerialize**](docs/FakeApi.md#fakeOuterNumberSerialize) | **POST** /fake/outer/number | 
 *FakeApi* | [**fakeOuterStringSerialize**](docs/FakeApi.md#fakeOuterStringSerialize) | **POST** /fake/outer/string | 
 *FakeApi* | [**fakePropertyEnumIntegerSerialize**](docs/FakeApi.md#fakePropertyEnumIntegerSerialize) | **POST** /fake/property/enum-int | 
+*FakeApi* | [**testAdditionalPropertiesReference**](docs/FakeApi.md#testAdditionalPropertiesReference) | **POST** /fake/additionalProperties-reference | test referenced additionalProperties
 *FakeApi* | [**testBodyWithBinary**](docs/FakeApi.md#testBodyWithBinary) | **PUT** /fake/body-with-binary | 
 *FakeApi* | [**testBodyWithFileSchema**](docs/FakeApi.md#testBodyWithFileSchema) | **PUT** /fake/body-with-file-schema | 
 *FakeApi* | [**testBodyWithQueryParams**](docs/FakeApi.md#testBodyWithQueryParams) | **PUT** /fake/body-with-query-params | 

samples/client/petstore/java/resttemplate-withXml/api/openapi.yaml

@@ -1010,6 +1010,25 @@ paths:
       - fake
       x-content-type: application/x-www-form-urlencoded
       x-accepts: application/json
+  /fake/additionalProperties-reference:
+    post:
+      description: ""
+      operationId: testAdditionalPropertiesReference
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/FreeFormObject'
+        description: request body
+        required: true
+      responses:
+        "200":
+          description: successful operation
+      summary: test referenced additionalProperties
+      tags:
+      - fake
+      x-content-type: application/json
+      x-accepts: application/json
   /fake/inline-additionalProperties:
     post:
       description: ""
@@ -1851,6 +1870,10 @@ components:
             type: string
           type: array
       type: object
+    FreeFormObject:
+      additionalProperties: true
+      description: A schema consisting only of additional properties
+      type: object
     OuterEnum:
       enum:
       - placed

samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md

@@ -12,6 +12,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 | [**fakeOuterNumberSerialize**](FakeApi.md#fakeOuterNumberSerialize) | **POST** /fake/outer/number |  |
 | [**fakeOuterStringSerialize**](FakeApi.md#fakeOuterStringSerialize) | **POST** /fake/outer/string |  |
 | [**fakePropertyEnumIntegerSerialize**](FakeApi.md#fakePropertyEnumIntegerSerialize) | **POST** /fake/property/enum-int |  |
+| [**testAdditionalPropertiesReference**](FakeApi.md#testAdditionalPropertiesReference) | **POST** /fake/additionalProperties-reference | test referenced additionalProperties |
 | [**testBodyWithBinary**](FakeApi.md#testBodyWithBinary) | **PUT** /fake/body-with-binary |  |
 | [**testBodyWithFileSchema**](FakeApi.md#testBodyWithFileSchema) | **PUT** /fake/body-with-file-schema |  |
 | [**testBodyWithQueryParams**](FakeApi.md#testBodyWithQueryParams) | **PUT** /fake/body-with-query-params |  |
@@ -548,6 +549,71 @@ No authorization required
 | **200** | Output enum (int) |  -  |
 
 
+## testAdditionalPropertiesReference
+
+> testAdditionalPropertiesReference(requestBody)
+
+test referenced additionalProperties
+
+
+
+### Example
+
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.FakeApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://petstore.swagger.io:80/v2");
+
+        FakeApi apiInstance = new FakeApi(defaultClient);
+        Map<String, Object> requestBody = null; // Map<String, Object> | request body
+        try {
+            apiInstance.testAdditionalPropertiesReference(requestBody);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling FakeApi#testAdditionalPropertiesReference");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+
+| Name | Type | Description  | Notes |
+|------------- | ------------- | ------------- | -------------|
+| **requestBody** | [**Map&lt;String, Object&gt;**](Object.md)| request body | |
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: Not defined
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | successful operation |  -  |
+
+
 ## testBodyWithBinary
 
 > testBodyWithBinary(body)

samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/api/FakeApi.java

@@ -412,6 +412,51 @@ public class FakeApi {
         ParameterizedTypeReference<OuterObjectWithEnumProperty> localReturnType = new ParameterizedTypeReference<OuterObjectWithEnumProperty>() {};
         return apiClient.invokeAPI("/fake/property/enum-int", HttpMethod.POST, Collections.<String, Object>emptyMap(), localVarQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAccept, localVarContentType, localVarAuthNames, localReturnType);
     }
+    /**
+     * test referenced additionalProperties
+     * 
+     * <p><b>200</b> - successful operation
+     * @param requestBody request body (required)
+     * @throws RestClientException if an error occurs while attempting to invoke the API
+     */
+    public void testAdditionalPropertiesReference(Map<String, Object> requestBody) throws RestClientException {
+        testAdditionalPropertiesReferenceWithHttpInfo(requestBody);
+    }
+
+    /**
+     * test referenced additionalProperties
+     * 
+     * <p><b>200</b> - successful operation
+     * @param requestBody request body (required)
+     * @return ResponseEntity&lt;Void&gt;
+     * @throws RestClientException if an error occurs while attempting to invoke the API
+     */
+    public ResponseEntity<Void> testAdditionalPropertiesReferenceWithHttpInfo(Map<String, Object> requestBody) throws RestClientException {
+        Object localVarPostBody = requestBody;
+        
+        // verify the required parameter 'requestBody' is set
+        if (requestBody == null) {
+            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'requestBody' when calling testAdditionalPropertiesReference");
+        }
+        
+
+        final MultiValueMap<String, String> localVarQueryParams = new LinkedMultiValueMap<String, String>();
+        final HttpHeaders localVarHeaderParams = new HttpHeaders();
+        final MultiValueMap<String, String> localVarCookieParams = new LinkedMultiValueMap<String, String>();
+        final MultiValueMap<String, Object> localVarFormParams = new LinkedMultiValueMap<String, Object>();
+
+        final String[] localVarAccepts = {  };
+        final List<MediaType> localVarAccept = apiClient.selectHeaderAccept(localVarAccepts);
+        final String[] localVarContentTypes = { 
+            "application/json"
+         };
+        final MediaType localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes);
+
+        String[] localVarAuthNames = new String[] {  };
+
+        ParameterizedTypeReference<Void> localReturnType = new ParameterizedTypeReference<Void>() {};
+        return apiClient.invokeAPI("/fake/additionalProperties-reference", HttpMethod.POST, Collections.<String, Object>emptyMap(), localVarQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAccept, localVarContentType, localVarAuthNames, localReturnType);
+    }
     /**
      * 
      * For this test, the body has to be a binary file.