better npe handling when processing openapi 3.1 spec

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -933,6 +933,11 @@ public class OpenAPINormalizer {
             return new Schema();
         }
 
+        // return schema if nothing in 3.1 spec types to normalize
+        if (schema.getTypes() == null) {
+            return schema;
+        }
+
         // process null
         if (schema.getTypes().contains("null")) {
             schema.setNullable(true);

modules/openapi-generator/src/test/resources/3_1/java/petstore.yaml

@@ -609,6 +609,44 @@ paths:
           $ref: '#/components/responses/ref'
     parameters:
       - $ref: '#/components/parameters/ref_to_uuid'
+  "/fake/api/changeowner":
+    post:
+      summary: op1
+      operationId: op1
+      tags:
+        - fake
+      parameters: []
+      responses:
+        '201':
+          description: Successful Response
+          content:
+            application/json:
+              schema: {}
+        '422':
+          description: Validation Error
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/HTTPValidationError"
+  "/fake/api/changename":
+    post:
+      summary: op2
+      operationId: op2
+      tags:
+        - fake
+      parameters: []
+      responses:
+        '201':
+          description: Successful Response
+          content:
+            application/json:
+              schema: {}
+        '422':
+          description: Validation Error
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/HTTPValidationError"
 externalDocs:
   description: Find out more about Swagger
   url: 'http://swagger.io'
@@ -847,3 +885,7 @@ components:
           description: test array in 3.1 spec
           items:
             type: string
+    HTTPValidationError:
+      properties: {}
+      type: object
+      title: HTTPValidationError

samples/client/petstore/java/okhttp-gson-3.1/README.md

@@ -91,12 +91,11 @@ public class Example {
     defaultClient.setBasePath("http://petstore.swagger.io/v2");
 
     FakeApi apiInstance = new FakeApi(defaultClient);
-    UUID refToUuid = UUID.fromString("61864654-6e6b-4152-a62f-795fdd606bc2"); // UUID | to test ref to parameter (uuid)
     try {
-      String result = apiInstance.refToRefParameter(refToUuid);
+      Object result = apiInstance.op1();
       System.out.println(result);
     } catch (ApiException e) {
-      System.err.println("Exception when calling FakeApi#refToRefParameter");
+      System.err.println("Exception when calling FakeApi#op1");
       System.err.println("Status code: " + e.getCode());
       System.err.println("Reason: " + e.getResponseBody());
       System.err.println("Response headers: " + e.getResponseHeaders());
@@ -113,6 +112,8 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
+*FakeApi* | [**op1**](docs/FakeApi.md#op1) | **POST** /fake/api/changeowner | op1
+*FakeApi* | [**op2**](docs/FakeApi.md#op2) | **POST** /fake/api/changename | op2
 *FakeApi* | [**refToRefParameter**](docs/FakeApi.md#refToRefParameter) | **GET** /ref/ref_to_parameter | 
 *FakeApi* | [**responseNoRef**](docs/FakeApi.md#responseNoRef) | **GET** /no_ref | 
 *FakeApi* | [**responseRefToNoRef**](docs/FakeApi.md#responseRefToNoRef) | **GET** /ref/no_ref | 

samples/client/petstore/java/okhttp-gson-3.1/api/openapi.yaml

@@ -654,6 +654,46 @@ paths:
       x-accepts: text/plain
     parameters:
     - $ref: '#/components/parameters/ref_to_uuid'
+  /fake/api/changeowner:
+    post:
+      operationId: op1
+      parameters: []
+      responses:
+        "201":
+          content:
+            application/json:
+              schema: {}
+          description: Successful Response
+        "422":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/HTTPValidationError'
+          description: Validation Error
+      summary: op1
+      tags:
+      - fake
+      x-accepts: application/json
+  /fake/api/changename:
+    post:
+      operationId: op2
+      parameters: []
+      responses:
+        "201":
+          content:
+            application/json:
+              schema: {}
+          description: Successful Response
+        "422":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/HTTPValidationError'
+          description: Validation Error
+      summary: op2
+      tags:
+      - fake
+      x-accepts: application/json
 components:
   parameters:
     ref_to_uuid:
@@ -912,6 +952,10 @@ components:
           items:
             type: string
           type: array
+    HTTPValidationError:
+      properties: {}
+      title: HTTPValidationError
+      type: object
     updatePetWithForm_request:
       properties:
         name:

samples/client/petstore/java/okhttp-gson-3.1/docs/FakeApi.md

@@ -4,12 +4,128 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 | Method | HTTP request | Description |
 |------------- | ------------- | -------------|
+| [**op1**](FakeApi.md#op1) | **POST** /fake/api/changeowner | op1 |
+| [**op2**](FakeApi.md#op2) | **POST** /fake/api/changename | op2 |
 | [**refToRefParameter**](FakeApi.md#refToRefParameter) | **GET** /ref/ref_to_parameter |  |
 | [**responseNoRef**](FakeApi.md#responseNoRef) | **GET** /no_ref |  |
 | [**responseRefToNoRef**](FakeApi.md#responseRefToNoRef) | **GET** /ref/no_ref |  |
 | [**responseRefToRef**](FakeApi.md#responseRefToRef) | **GET** /ref/ref |  |
 
 
+<a id="op1"></a>
+# **op1**
+> Object op1()
+
+op1
+
+### 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/v2");
+
+    FakeApi apiInstance = new FakeApi(defaultClient);
+    try {
+      Object result = apiInstance.op1();
+      System.out.println(result);
+    } catch (ApiException e) {
+      System.err.println("Exception when calling FakeApi#op1");
+      System.err.println("Status code: " + e.getCode());
+      System.err.println("Reason: " + e.getResponseBody());
+      System.err.println("Response headers: " + e.getResponseHeaders());
+      e.printStackTrace();
+    }
+  }
+}
+```
+
+### Parameters
+This endpoint does not need any parameter.
+
+### Return type
+
+**Object**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: application/json
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **201** | Successful Response |  -  |
+| **422** | Validation Error |  -  |
+
+<a id="op2"></a>
+# **op2**
+> Object op2()
+
+op2
+
+### 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/v2");
+
+    FakeApi apiInstance = new FakeApi(defaultClient);
+    try {
+      Object result = apiInstance.op2();
+      System.out.println(result);
+    } catch (ApiException e) {
+      System.err.println("Exception when calling FakeApi#op2");
+      System.err.println("Status code: " + e.getCode());
+      System.err.println("Reason: " + e.getResponseBody());
+      System.err.println("Response headers: " + e.getResponseHeaders());
+      e.printStackTrace();
+    }
+  }
+}
+```
+
+### Parameters
+This endpoint does not need any parameter.
+
+### Return type
+
+**Object**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: application/json
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **201** | Successful Response |  -  |
+| **422** | Validation Error |  -  |
+
 <a id="refToRefParameter"></a>
 # **refToRefParameter**
 > String refToRefParameter(refToUuid)

samples/client/petstore/java/okhttp-gson-3.1/src/main/java/org/openapitools/client/api/FakeApi.java

@@ -72,6 +72,240 @@ public class FakeApi {
         this.localCustomBaseUrl = customBaseUrl;
     }
 
+    /**
+     * Build call for op1
+     * @param _callback Callback for upload/download progress
+     * @return Call to execute
+     * @throws ApiException If fail to serialize the request body object
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public okhttp3.Call op1Call(final ApiCallback _callback) throws ApiException {
+        String basePath = null;
+        // Operation Servers
+        String[] localBasePaths = new String[] {  };
+
+        // Determine Base Path to Use
+        if (localCustomBaseUrl != null){
+            basePath = localCustomBaseUrl;
+        } else if ( localBasePaths.length > 0 ) {
+            basePath = localBasePaths[localHostIndex];
+        } else {
+            basePath = null;
+        }
+
+        Object localVarPostBody = null;
+
+        // create path and map variables
+        String localVarPath = "/fake/api/changeowner";
+
+        List<Pair> localVarQueryParams = new ArrayList<Pair>();
+        List<Pair> localVarCollectionQueryParams = new ArrayList<Pair>();
+        Map<String, String> localVarHeaderParams = new HashMap<String, String>();
+        Map<String, String> localVarCookieParams = new HashMap<String, String>();
+        Map<String, Object> localVarFormParams = new HashMap<String, Object>();
+
+        final String[] localVarAccepts = {
+            "application/json"
+        };
+        final String localVarAccept = localVarApiClient.selectHeaderAccept(localVarAccepts);
+        if (localVarAccept != null) {
+            localVarHeaderParams.put("Accept", localVarAccept);
+        }
+
+        final String[] localVarContentTypes = {
+        };
+        final String localVarContentType = localVarApiClient.selectHeaderContentType(localVarContentTypes);
+        if (localVarContentType != null) {
+            localVarHeaderParams.put("Content-Type", localVarContentType);
+        }
+
+        String[] localVarAuthNames = new String[] {  };
+        return localVarApiClient.buildCall(basePath, localVarPath, "POST", localVarQueryParams, localVarCollectionQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAuthNames, _callback);
+    }
+
+    @SuppressWarnings("rawtypes")
+    private okhttp3.Call op1ValidateBeforeCall(final ApiCallback _callback) throws ApiException {
+        return op1Call(_callback);
+
+    }
+
+    /**
+     * op1
+     * 
+     * @return Object
+     * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public Object op1() throws ApiException {
+        ApiResponse<Object> localVarResp = op1WithHttpInfo();
+        return localVarResp.getData();
+    }
+
+    /**
+     * op1
+     * 
+     * @return ApiResponse&lt;Object&gt;
+     * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public ApiResponse<Object> op1WithHttpInfo() throws ApiException {
+        okhttp3.Call localVarCall = op1ValidateBeforeCall(null);
+        Type localVarReturnType = new TypeToken<Object>(){}.getType();
+        return localVarApiClient.execute(localVarCall, localVarReturnType);
+    }
+
+    /**
+     * op1 (asynchronously)
+     * 
+     * @param _callback The callback to be executed when the API call finishes
+     * @return The request call
+     * @throws ApiException If fail to process the API call, e.g. serializing the request body object
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public okhttp3.Call op1Async(final ApiCallback<Object> _callback) throws ApiException {
+
+        okhttp3.Call localVarCall = op1ValidateBeforeCall(_callback);
+        Type localVarReturnType = new TypeToken<Object>(){}.getType();
+        localVarApiClient.executeAsync(localVarCall, localVarReturnType, _callback);
+        return localVarCall;
+    }
+    /**
+     * Build call for op2
+     * @param _callback Callback for upload/download progress
+     * @return Call to execute
+     * @throws ApiException If fail to serialize the request body object
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public okhttp3.Call op2Call(final ApiCallback _callback) throws ApiException {
+        String basePath = null;
+        // Operation Servers
+        String[] localBasePaths = new String[] {  };
+
+        // Determine Base Path to Use
+        if (localCustomBaseUrl != null){
+            basePath = localCustomBaseUrl;
+        } else if ( localBasePaths.length > 0 ) {
+            basePath = localBasePaths[localHostIndex];
+        } else {
+            basePath = null;
+        }
+
+        Object localVarPostBody = null;
+
+        // create path and map variables
+        String localVarPath = "/fake/api/changename";
+
+        List<Pair> localVarQueryParams = new ArrayList<Pair>();
+        List<Pair> localVarCollectionQueryParams = new ArrayList<Pair>();
+        Map<String, String> localVarHeaderParams = new HashMap<String, String>();
+        Map<String, String> localVarCookieParams = new HashMap<String, String>();
+        Map<String, Object> localVarFormParams = new HashMap<String, Object>();
+
+        final String[] localVarAccepts = {
+            "application/json"
+        };
+        final String localVarAccept = localVarApiClient.selectHeaderAccept(localVarAccepts);
+        if (localVarAccept != null) {
+            localVarHeaderParams.put("Accept", localVarAccept);
+        }
+
+        final String[] localVarContentTypes = {
+        };
+        final String localVarContentType = localVarApiClient.selectHeaderContentType(localVarContentTypes);
+        if (localVarContentType != null) {
+            localVarHeaderParams.put("Content-Type", localVarContentType);
+        }
+
+        String[] localVarAuthNames = new String[] {  };
+        return localVarApiClient.buildCall(basePath, localVarPath, "POST", localVarQueryParams, localVarCollectionQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAuthNames, _callback);
+    }
+
+    @SuppressWarnings("rawtypes")
+    private okhttp3.Call op2ValidateBeforeCall(final ApiCallback _callback) throws ApiException {
+        return op2Call(_callback);
+
+    }
+
+    /**
+     * op2
+     * 
+     * @return Object
+     * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public Object op2() throws ApiException {
+        ApiResponse<Object> localVarResp = op2WithHttpInfo();
+        return localVarResp.getData();
+    }
+
+    /**
+     * op2
+     * 
+     * @return ApiResponse&lt;Object&gt;
+     * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public ApiResponse<Object> op2WithHttpInfo() throws ApiException {
+        okhttp3.Call localVarCall = op2ValidateBeforeCall(null);
+        Type localVarReturnType = new TypeToken<Object>(){}.getType();
+        return localVarApiClient.execute(localVarCall, localVarReturnType);
+    }
+
+    /**
+     * op2 (asynchronously)
+     * 
+     * @param _callback The callback to be executed when the API call finishes
+     * @return The request call
+     * @throws ApiException If fail to process the API call, e.g. serializing the request body object
+     * @http.response.details
+     <table summary="Response Details" border="1">
+        <tr><td> Status Code </td><td> Description </td><td> Response Headers </td></tr>
+        <tr><td> 201 </td><td> Successful Response </td><td>  -  </td></tr>
+        <tr><td> 422 </td><td> Validation Error </td><td>  -  </td></tr>
+     </table>
+     */
+    public okhttp3.Call op2Async(final ApiCallback<Object> _callback) throws ApiException {
+
+        okhttp3.Call localVarCall = op2ValidateBeforeCall(_callback);
+        Type localVarReturnType = new TypeToken<Object>(){}.getType();
+        localVarApiClient.executeAsync(localVarCall, localVarReturnType, _callback);
+        return localVarCall;
+    }
     /**
      * Build call for refToRefParameter
      * @param refToUuid to test ref to parameter (uuid) (required)