Better handling of operationID starting with numbers (#691)

* add numeric operationid to test spec

* better handling of operationId in more generators

* fix go toOperationId

* update samples

* update java samples

* update java samples (vertx, webclient)

* update java google api client sample

* fix typo, update OAS3 test spec, update php petstore (oas3)

* defer camelize in operationid

* remove duplicated sanitizeName

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

@@ -603,6 +603,12 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
             operationId = "call_" + operationId;
         }
 
+        // operationId starts with a number
+        if (operationId.matches("^\\d.*")) {
+            LOGGER.warn(operationId + " (starting with a number) cannot be used as method name. Renamed to " + camelize(sanitizeName("call_" + operationId)));
+            operationId = "call_" + operationId;
+        }
+
         return camelize(sanitizeName(operationId));
     }
 

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

@@ -314,7 +314,13 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
         // method name cannot use reserved keyword, e.g. return
         if (isReservedWord(sanitizedOperationId)) {
             LOGGER.warn(operationId + " (reserved word) cannot be used as method name. Renamed to "
-                    + camelize("call_" + operationId));
+                    + camelize("call_" + sanitizedOperationId));
+            sanitizedOperationId = "call_" + sanitizedOperationId;
+        }
+
+        // operationId starts with a number
+        if (sanitizedOperationId.matches("^\\d.*")) {
+            LOGGER.warn(operationId + " (starting with a number) cannot be used as method name. Renamed to " + camelize("call_" + sanitizedOperationId));
             sanitizedOperationId = "call_" + sanitizedOperationId;
         }
 

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

@@ -884,6 +884,12 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             return newOperationId;
         }
 
+        // operationId starts with a number
+        if (operationId.matches("^\\d.*")) {
+            LOGGER.warn(operationId + " (starting with a number) cannot be used as method sname. Renamed to " + camelize("call_" + operationId), true);
+            operationId = camelize("call_" + operationId, true);
+        }
+
         return operationId;
     }
 

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

@@ -377,8 +377,14 @@ public class PerlClientCodegen extends DefaultCodegen implements CodegenConfig {
 
         // method name cannot use reserved keyword, e.g. return
         if (isReservedWord(operationId)) {
-            LOGGER.warn(operationId + " (reserved word) cannot be used as method name. Renamed to " + underscore("call_" + operationId));
+            LOGGER.warn(operationId + " (reserved word) cannot be used as method name. Renamed to " + underscore(sanitizeName("call_" + operationId)));
-            return underscore("call_" + operationId);
+            return underscore(sanitizeName("call_" + operationId));
+        }
+
+        // operationId starts with a number
+        if (operationId.matches("^\\d.*")) {
+            LOGGER.warn(operationId + " (starting with a number) cannot be used as method name. Renamed to " + underscore(sanitizeName("call_" + operationId)));
+            operationId = "call_" + operationId;
         }
 
         //return underscore(operationId).replaceAll("[^A-Za-z0-9_]", "");

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

@@ -552,7 +552,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
             operationId = "call_" + operationId;
         }
 
-        // model name starts with a number
+        // operationId starts with a number
         if (operationId.matches("^\\d.*")) {
             LOGGER.warn(operationId + " (starting with a number) cannot be used as method name. Renamed to " + underscore(sanitizeName("call_" + operationId)));
             operationId = "call_" + operationId;

modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -929,8 +929,8 @@ paths:
       tags:
         - "$another-fake?"
       summary: To test special tags
-      description: To test special tags
+      description: To test special tags and operation ID starting with number
-      operationId: test_special_tags
+      operationId: 123_test_@#$%_special_tags
       consumes:
         - application/json
       produces:

modules/openapi-generator/src/test/resources/3_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -898,8 +898,8 @@ paths:
       tags:
         - $another-fake?
       summary: To test special tags
-      description: To test special tags
+      description: To test special tags and operation ID starting with number
-      operationId: test_special_tags
+      operationId: 123_test_@#$%_special_tags
       responses:
         '200':
           description: successful operation

samples/client/petstore/go/go-petstore/.openapi-generator/VERSION

@@ -1 +1 @@
-3.1.1-SNAPSHOT
+3.2.0-SNAPSHOT

samples/client/petstore/go/go-petstore/README.md

@@ -30,7 +30,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*AnotherFakeApi* | [**TestSpecialTags**](docs/AnotherFakeApi.md#testspecialtags) | **Patch** /another-fake/dummy | To test special tags
+*AnotherFakeApi* | [**Call123TestSpecialTags**](docs/AnotherFakeApi.md#call123testspecialtags) | **Patch** /another-fake/dummy | To test special tags
 *FakeApi* | [**FakeOuterBooleanSerialize**](docs/FakeApi.md#fakeouterbooleanserialize) | **Post** /fake/outer/boolean | 
 *FakeApi* | [**FakeOuterCompositeSerialize**](docs/FakeApi.md#fakeoutercompositeserialize) | **Post** /fake/outer/composite | 
 *FakeApi* | [**FakeOuterNumberSerialize**](docs/FakeApi.md#fakeouternumberserialize) | **Post** /fake/outer/number | 

samples/client/petstore/go/go-petstore/api/openapi.yaml

@@ -954,8 +954,8 @@ paths:
       - fake
   /another-fake/dummy:
     patch:
-      description: To test special tags
+      description: To test special tags and operation ID starting with number
-      operationId: test_special_tags
+      operationId: 123_test_@#$%_special_tags
       requestBody:
         content:
           application/json:

samples/client/petstore/go/go-petstore/api_another_fake.go

@@ -26,12 +26,12 @@ type AnotherFakeApiService service
 
 /*
 AnotherFakeApiService To test special tags
-To test special tags
+To test special tags and operation ID starting with number
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
  * @param client client model
 @return Client
 */
-func (a *AnotherFakeApiService) TestSpecialTags(ctx context.Context, client Client) (Client, *http.Response, error) {
+func (a *AnotherFakeApiService) Call123TestSpecialTags(ctx context.Context, client Client) (Client, *http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("Patch")
 		localVarPostBody     interface{}

samples/client/petstore/go/go-petstore/docs/AnotherFakeApi.md

@@ -4,14 +4,14 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**TestSpecialTags**](AnotherFakeApi.md#TestSpecialTags) | **Patch** /another-fake/dummy | To test special tags
+[**Call123TestSpecialTags**](AnotherFakeApi.md#Call123TestSpecialTags) | **Patch** /another-fake/dummy | To test special tags
 
 
-# **TestSpecialTags**
+# **Call123TestSpecialTags**
-> Client TestSpecialTags(ctx, client)
+> Client Call123TestSpecialTags(ctx, client)
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Required Parameters
 

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

@@ -17,7 +17,7 @@ public interface AnotherFakeApi extends ApiClient.Api {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
     * @param client client model (required)
    * @return Client
    */
@@ -26,5 +26,5 @@ public interface AnotherFakeApi extends ApiClient.Api {
     "Content-Type: application/json",
     "Accept: application/json",
   })
-  Client testSpecialTags(Client client);
+  Client call123testSpecialTags(Client client);
 }

samples/client/petstore/java/google-api-client/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -42,37 +42,37 @@ public class AnotherFakeApi {
 
   /**
     * To test special tags
-    * To test special tags
+    * To test special tags and operation ID starting with number
     * <p><b>200</b> - successful operation
     * @param client client model
     * @return Client
     * @throws IOException if an error occurs while attempting to invoke the API
     **/
-    public Client testSpecialTags(Client client) throws IOException {
+    public Client call123testSpecialTags(Client client) throws IOException {
-        HttpResponse response = testSpecialTagsForHttpResponse(client);
+        HttpResponse response = call123testSpecialTagsForHttpResponse(client);
         TypeReference typeRef = new TypeReference<Client>() {};
         return apiClient.getObjectMapper().readValue(response.getContent(), typeRef);
     }
 
   /**
     * To test special tags
-    * To test special tags
+    * To test special tags and operation ID starting with number
     * <p><b>200</b> - successful operation
     * @param client client model
     * @param params Map of query params. A collection will be interpreted as passing in multiple instances of the same query param.
     * @return Client
     * @throws IOException if an error occurs while attempting to invoke the API
     **/
-    public Client testSpecialTags(Client client, Map<String, Object> params) throws IOException {
+    public Client call123testSpecialTags(Client client, Map<String, Object> params) throws IOException {
-        HttpResponse response = testSpecialTagsForHttpResponse(client, params);
+        HttpResponse response = call123testSpecialTagsForHttpResponse(client, params);
         TypeReference typeRef = new TypeReference<Client>() {};
         return apiClient.getObjectMapper().readValue(response.getContent(), typeRef);
     }
 
-    public HttpResponse testSpecialTagsForHttpResponse(Client client) throws IOException {
+    public HttpResponse call123testSpecialTagsForHttpResponse(Client client) throws IOException {
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new IllegalArgumentException("Missing the required parameter 'client' when calling testSpecialTags");
+            throw new IllegalArgumentException("Missing the required parameter 'client' when calling call123testSpecialTags");
         }
         UriBuilder uriBuilder = UriBuilder.fromUri(apiClient.getBasePath() + "/another-fake/dummy");
 
@@ -83,10 +83,10 @@ public class AnotherFakeApi {
         return apiClient.getHttpRequestFactory().buildRequest(HttpMethods.PATCH, genericUrl, content).execute();
     }
 
-      public HttpResponse testSpecialTagsForHttpResponse(java.io.InputStream client, String mediaType) throws IOException {
+      public HttpResponse call123testSpecialTagsForHttpResponse(java.io.InputStream client, String mediaType) throws IOException {
           // verify the required parameter 'client' is set
               if (client == null) {
-              throw new IllegalArgumentException("Missing the required parameter 'client' when calling testSpecialTags");
+              throw new IllegalArgumentException("Missing the required parameter 'client' when calling call123testSpecialTags");
               }
               UriBuilder uriBuilder = UriBuilder.fromUri(apiClient.getBasePath() + "/another-fake/dummy");
 
@@ -99,10 +99,10 @@ public class AnotherFakeApi {
               return apiClient.getHttpRequestFactory().buildRequest(HttpMethods.PATCH, genericUrl, content).execute();
       }
 
-    public HttpResponse testSpecialTagsForHttpResponse(Client client, Map<String, Object> params) throws IOException {
+    public HttpResponse call123testSpecialTagsForHttpResponse(Client client, Map<String, Object> params) throws IOException {
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new IllegalArgumentException("Missing the required parameter 'client' when calling testSpecialTags");
+            throw new IllegalArgumentException("Missing the required parameter 'client' when calling call123testSpecialTags");
         }
         UriBuilder uriBuilder = UriBuilder.fromUri(apiClient.getBasePath() + "/another-fake/dummy");
 

samples/client/petstore/java/google-api-client/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws IOException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws IOException {
+    public void call123testSpecialTagsTest() throws IOException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/jersey1/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/jersey1/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -50,17 +50,17 @@ public class AnotherFakeApi {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Client
    * @throws ApiException if fails to make API call
    */
-  public Client testSpecialTags(Client client) throws ApiException {
+  public Client call123testSpecialTags(Client client) throws ApiException {
     Object localVarPostBody = client;
     
     // verify the required parameter 'client' is set
     if (client == null) {
-      throw new ApiException(400, "Missing the required parameter 'client' when calling testSpecialTags");
+      throw new ApiException(400, "Missing the required parameter 'client' when calling call123testSpecialTags");
     }
     
     // create path and map variables

samples/client/petstore/java/jersey1/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/jersey2-java6/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/jersey2-java6/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -37,28 +37,28 @@ public class AnotherFakeApi {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Client
    * @throws ApiException if fails to make API call
    */
-  public Client testSpecialTags(Client client) throws ApiException {
+  public Client call123testSpecialTags(Client client) throws ApiException {
-    return testSpecialTagsWithHttpInfo(client).getData();
+    return call123testSpecialTagsWithHttpInfo(client).getData();
       }
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return ApiResponse<Client>
    * @throws ApiException if fails to make API call
    */
-  public ApiResponse<Client> testSpecialTagsWithHttpInfo(Client client) throws ApiException {
+  public ApiResponse<Client> call123testSpecialTagsWithHttpInfo(Client client) throws ApiException {
     Object localVarPostBody = client;
     
     // verify the required parameter 'client' is set
     if (client == null) {
-      throw new ApiException(400, "Missing the required parameter 'client' when calling testSpecialTags");
+      throw new ApiException(400, "Missing the required parameter 'client' when calling call123testSpecialTags");
     }
     
     // create path and map variables

samples/client/petstore/java/jersey2-java8/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -37,28 +37,28 @@ public class AnotherFakeApi {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Client
    * @throws ApiException if fails to make API call
    */
-  public Client testSpecialTags(Client client) throws ApiException {
+  public Client call123testSpecialTags(Client client) throws ApiException {
-    return testSpecialTagsWithHttpInfo(client).getData();
+    return call123testSpecialTagsWithHttpInfo(client).getData();
       }
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return ApiResponse<Client>
    * @throws ApiException if fails to make API call
    */
-  public ApiResponse<Client> testSpecialTagsWithHttpInfo(Client client) throws ApiException {
+  public ApiResponse<Client> call123testSpecialTagsWithHttpInfo(Client client) throws ApiException {
     Object localVarPostBody = client;
     
     // verify the required parameter 'client' is set
     if (client == null) {
-      throw new ApiException(400, "Missing the required parameter 'client' when calling testSpecialTags");
+      throw new ApiException(400, "Missing the required parameter 'client' when calling call123testSpecialTags");
     }
     
     // create path and map variables

samples/client/petstore/java/jersey2-java8/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/jersey2/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/jersey2/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -37,28 +37,28 @@ public class AnotherFakeApi {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Client
    * @throws ApiException if fails to make API call
    */
-  public Client testSpecialTags(Client client) throws ApiException {
+  public Client call123testSpecialTags(Client client) throws ApiException {
-    return testSpecialTagsWithHttpInfo(client).getData();
+    return call123testSpecialTagsWithHttpInfo(client).getData();
       }
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return ApiResponse<Client>
    * @throws ApiException if fails to make API call
    */
-  public ApiResponse<Client> testSpecialTagsWithHttpInfo(Client client) throws ApiException {
+  public ApiResponse<Client> call123testSpecialTagsWithHttpInfo(Client client) throws ApiException {
     Object localVarPostBody = client;
     
     // verify the required parameter 'client' is set
     if (client == null) {
-      throw new ApiException(400, "Missing the required parameter 'client' when calling testSpecialTags");
+      throw new ApiException(400, "Missing the required parameter 'client' when calling call123testSpecialTags");
     }
     
     // create path and map variables

samples/client/petstore/java/jersey2/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/okhttp-gson-parcelableModel/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -55,14 +55,14 @@ public class AnotherFakeApi {
     }
 
     /**
-     * Build call for testSpecialTags
+     * Build call for call123testSpecialTags
      * @param client client model (required)
      * @param progressListener Progress listener
      * @param progressRequestListener Progress request listener
      * @return Call to execute
      * @throws ApiException If fail to serialize the request body object
      */
-    public com.squareup.okhttp.Call testSpecialTagsCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
+    public com.squareup.okhttp.Call call123testSpecialTagsCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
         Object localVarPostBody = client;
 
         // create path and map variables
@@ -104,53 +104,53 @@ public class AnotherFakeApi {
     }
 
     @SuppressWarnings("rawtypes")
-    private com.squareup.okhttp.Call testSpecialTagsValidateBeforeCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
+    private com.squareup.okhttp.Call call123testSpecialTagsValidateBeforeCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new ApiException("Missing the required parameter 'client' when calling testSpecialTags(Async)");
+            throw new ApiException("Missing the required parameter 'client' when calling call123testSpecialTags(Async)");
         }
         
 
-        com.squareup.okhttp.Call call = testSpecialTagsCall(client, progressListener, progressRequestListener);
+        com.squareup.okhttp.Call call = call123testSpecialTagsCall(client, progressListener, progressRequestListener);
         return call;
 
     }
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @return Client
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      */
-    public Client testSpecialTags(Client client) throws ApiException {
+    public Client call123testSpecialTags(Client client) throws ApiException {
-        ApiResponse<Client> resp = testSpecialTagsWithHttpInfo(client);
+        ApiResponse<Client> resp = call123testSpecialTagsWithHttpInfo(client);
         return resp.getData();
     }
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @return ApiResponse&lt;Client&gt;
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      */
-    public ApiResponse<Client> testSpecialTagsWithHttpInfo(Client client) throws ApiException {
+    public ApiResponse<Client> call123testSpecialTagsWithHttpInfo(Client client) throws ApiException {
-        com.squareup.okhttp.Call call = testSpecialTagsValidateBeforeCall(client, null, null);
+        com.squareup.okhttp.Call call = call123testSpecialTagsValidateBeforeCall(client, null, null);
         Type localVarReturnType = new TypeToken<Client>(){}.getType();
         return apiClient.execute(call, localVarReturnType);
     }
 
     /**
      * To test special tags (asynchronously)
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @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
      */
-    public com.squareup.okhttp.Call testSpecialTagsAsync(Client client, final ApiCallback<Client> callback) throws ApiException {
+    public com.squareup.okhttp.Call call123testSpecialTagsAsync(Client client, final ApiCallback<Client> callback) throws ApiException {
 
         ProgressResponseBody.ProgressListener progressListener = null;
         ProgressRequestBody.ProgressRequestListener progressRequestListener = null;
@@ -171,7 +171,7 @@ public class AnotherFakeApi {
             };
         }
 
-        com.squareup.okhttp.Call call = testSpecialTagsValidateBeforeCall(client, progressListener, progressRequestListener);
+        com.squareup.okhttp.Call call = call123testSpecialTagsValidateBeforeCall(client, progressListener, progressRequestListener);
         Type localVarReturnType = new TypeToken<Client>(){}.getType();
         apiClient.executeAsync(call, localVarReturnType, callback);
         return call;

samples/client/petstore/java/okhttp-gson/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

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

@@ -55,14 +55,14 @@ public class AnotherFakeApi {
     }
 
     /**
-     * Build call for testSpecialTags
+     * Build call for call123testSpecialTags
      * @param client client model (required)
      * @param progressListener Progress listener
      * @param progressRequestListener Progress request listener
      * @return Call to execute
      * @throws ApiException If fail to serialize the request body object
      */
-    public com.squareup.okhttp.Call testSpecialTagsCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
+    public com.squareup.okhttp.Call call123testSpecialTagsCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
         Object localVarPostBody = client;
 
         // create path and map variables
@@ -104,53 +104,53 @@ public class AnotherFakeApi {
     }
 
     @SuppressWarnings("rawtypes")
-    private com.squareup.okhttp.Call testSpecialTagsValidateBeforeCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
+    private com.squareup.okhttp.Call call123testSpecialTagsValidateBeforeCall(Client client, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener) throws ApiException {
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new ApiException("Missing the required parameter 'client' when calling testSpecialTags(Async)");
+            throw new ApiException("Missing the required parameter 'client' when calling call123testSpecialTags(Async)");
         }
         
 
-        com.squareup.okhttp.Call call = testSpecialTagsCall(client, progressListener, progressRequestListener);
+        com.squareup.okhttp.Call call = call123testSpecialTagsCall(client, progressListener, progressRequestListener);
         return call;
 
     }
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @return Client
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      */
-    public Client testSpecialTags(Client client) throws ApiException {
+    public Client call123testSpecialTags(Client client) throws ApiException {
-        ApiResponse<Client> resp = testSpecialTagsWithHttpInfo(client);
+        ApiResponse<Client> resp = call123testSpecialTagsWithHttpInfo(client);
         return resp.getData();
     }
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @return ApiResponse&lt;Client&gt;
      * @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body
      */
-    public ApiResponse<Client> testSpecialTagsWithHttpInfo(Client client) throws ApiException {
+    public ApiResponse<Client> call123testSpecialTagsWithHttpInfo(Client client) throws ApiException {
-        com.squareup.okhttp.Call call = testSpecialTagsValidateBeforeCall(client, null, null);
+        com.squareup.okhttp.Call call = call123testSpecialTagsValidateBeforeCall(client, null, null);
         Type localVarReturnType = new TypeToken<Client>(){}.getType();
         return apiClient.execute(call, localVarReturnType);
     }
 
     /**
      * To test special tags (asynchronously)
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @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
      */
-    public com.squareup.okhttp.Call testSpecialTagsAsync(Client client, final ApiCallback<Client> callback) throws ApiException {
+    public com.squareup.okhttp.Call call123testSpecialTagsAsync(Client client, final ApiCallback<Client> callback) throws ApiException {
 
         ProgressResponseBody.ProgressListener progressListener = null;
         ProgressRequestBody.ProgressRequestListener progressRequestListener = null;
@@ -171,7 +171,7 @@ public class AnotherFakeApi {
             };
         }
 
-        com.squareup.okhttp.Call call = testSpecialTagsValidateBeforeCall(client, progressListener, progressRequestListener);
+        com.squareup.okhttp.Call call = call123testSpecialTagsValidateBeforeCall(client, progressListener, progressRequestListener);
         Type localVarReturnType = new TypeToken<Client>(){}.getType();
         apiClient.executeAsync(call, localVarReturnType, callback);
         return call;

samples/client/petstore/java/okhttp-gson/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/rest-assured/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -26,7 +26,7 @@ AnotherFakeApi api = ApiClient.api(ApiClient.Config.apiConfig().withReqSpecSuppl
                 () -> new RequestSpecBuilder()
                         .setBaseUri("http://petstore.swagger.io:80/v2"))).anotherFake();
 
-api.testSpecialTags()
+api.call123testSpecialTags()
     .body(client).execute(r -> r.prettyPeek());
 ```
 

samples/client/petstore/java/rest-assured/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -47,8 +47,8 @@ public class AnotherFakeApi {
     }
 
 
-    public TestSpecialTagsOper testSpecialTags() {
+    public Call123testSpecialTagsOper call123testSpecialTags() {
-        return new TestSpecialTagsOper(reqSpec);
+        return new Call123testSpecialTagsOper(reqSpec);
     }
 
     /**
@@ -63,12 +63,12 @@ public class AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @see #body client model (required)
      * return Client
      */
-    public class TestSpecialTagsOper {
+    public class Call123testSpecialTagsOper {
 
         public static final String REQ_METHOD = "PATCH";
         public static final String REQ_URI = "/another-fake/dummy";
@@ -78,14 +78,14 @@ public class AnotherFakeApi {
 
         private ResponseSpecBuilder respSpec;
 
-        public TestSpecialTagsOper() {
+        public Call123testSpecialTagsOper() {
             this.reqSpec = new RequestSpecBuilder();
             reqSpec.setContentType("application/json");
             reqSpec.setAccept("application/json");
             this.respSpec = new ResponseSpecBuilder();
         }
 
-        public TestSpecialTagsOper(RequestSpecBuilder reqSpec) {
+        public Call123testSpecialTagsOper(RequestSpecBuilder reqSpec) {
             this.reqSpec = reqSpec;
             reqSpec.setContentType("application/json");
             reqSpec.setAccept("application/json");
@@ -116,7 +116,7 @@ public class AnotherFakeApi {
          * @param client (Client) client model (required)
          * @return operation
          */
-        public TestSpecialTagsOper body(Client client) {
+        public Call123testSpecialTagsOper body(Client client) {
             reqSpec.setBody(client);
             return this;
         }
@@ -126,7 +126,7 @@ public class AnotherFakeApi {
          * @param consumer consumer
          * @return operation
          */
-        public TestSpecialTagsOper reqSpec(Consumer<RequestSpecBuilder> consumer) {
+        public Call123testSpecialTagsOper reqSpec(Consumer<RequestSpecBuilder> consumer) {
             consumer.accept(reqSpec);
             return this;
         }
@@ -136,7 +136,7 @@ public class AnotherFakeApi {
          * @param consumer consumer
          * @return operation
          */
-        public TestSpecialTagsOper respSpec(Consumer<ResponseSpecBuilder> consumer) {
+        public Call123testSpecialTagsOper respSpec(Consumer<ResponseSpecBuilder> consumer) {
             consumer.accept(respSpec);
             return this;
         }

samples/client/petstore/java/rest-assured/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -50,9 +50,9 @@ public class AnotherFakeApiTest {
      * successful operation
      */
     @Test
-    public void shouldSee200AfterTestSpecialTags() {
+    public void shouldSee200AfterCall123testSpecialTags() {
         Client client = null;
-        api.testSpecialTags()
+        api.call123testSpecialTags()
                 .body(client).execute(r -> r.prettyPeek());
         // TODO: test validations
     }

samples/client/petstore/java/resteasy/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -36,17 +36,17 @@ public class AnotherFakeApi {
 
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return a {@code Client}
    * @throws ApiException if fails to make API call
    */
-  public Client testSpecialTags(Client client) throws ApiException {
+  public Client call123testSpecialTags(Client client) throws ApiException {
     Object localVarPostBody = client;
     
     // verify the required parameter 'client' is set
     if (client == null) {
-      throw new ApiException(400, "Missing the required parameter 'client' when calling testSpecialTags");
+      throw new ApiException(400, "Missing the required parameter 'client' when calling call123testSpecialTags");
     }
     
     // create path and map variables

samples/client/petstore/java/resteasy/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

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

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

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

@@ -47,18 +47,18 @@ public class AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * <p><b>200</b> - successful operation
      * @param client client model
      * @return Client
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
-    public Client testSpecialTags(Client client) throws RestClientException {
+    public Client call123testSpecialTags(Client client) throws RestClientException {
         Object postBody = client;
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling testSpecialTags");
+            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling call123testSpecialTags");
         }
         
         String path = UriComponentsBuilder.fromPath("/another-fake/dummy").build().toUriString();

samples/client/petstore/java/resttemplate-withXml/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -34,15 +34,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() {
+    public void call123testSpecialTagsTest() {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/resttemplate/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -47,18 +47,18 @@ public class AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * <p><b>200</b> - successful operation
      * @param client client model
      * @return Client
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
-    public Client testSpecialTags(Client client) throws RestClientException {
+    public Client call123testSpecialTags(Client client) throws RestClientException {
         Object postBody = client;
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling testSpecialTags");
+            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling call123testSpecialTags");
         }
         
         String path = UriComponentsBuilder.fromPath("/another-fake/dummy").build().toUriString();

samples/client/petstore/java/resttemplate/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -34,15 +34,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() {
+    public void call123testSpecialTagsTest() {
         Client client = null;
-        Client response = api.testSpecialTags(client);
+        Client response = api.call123testSpecialTags(client);
 
         // TODO: test validations
     }

samples/client/petstore/java/retrofit/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -17,13 +17,13 @@ public interface AnotherFakeApi {
   /**
    * To test special tags
    * Sync method
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Client
    */
   
   @PATCH("/another-fake/dummy")
-  Client testSpecialTags(
+  Client call123testSpecialTags(
     @retrofit.http.Body Client client
   );
 
@@ -35,7 +35,7 @@ public interface AnotherFakeApi {
    */
   
   @PATCH("/another-fake/dummy")
-  void testSpecialTags(
+  void call123testSpecialTags(
     @retrofit.http.Body Client client, Callback<Client> cb
   );
 }

samples/client/petstore/java/retrofit2-play24/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/retrofit2-play24/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -24,7 +24,7 @@ import retrofit2.Response;
 public interface AnotherFakeApi {
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Call<Client>
    */
@@ -32,7 +32,7 @@ public interface AnotherFakeApi {
     "Content-Type:application/json"
   })
   @PATCH("another-fake/dummy")
-  F.Promise<Response<Client>> testSpecialTags(
+  F.Promise<Response<Client>> call123testSpecialTags(
     @retrofit2.http.Body Client client
   );
 

samples/client/petstore/java/retrofit2-play25/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/retrofit2-play25/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -24,7 +24,7 @@ import retrofit2.Response;
 public interface AnotherFakeApi {
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Call<Client>
    */
@@ -32,7 +32,7 @@ public interface AnotherFakeApi {
     "Content-Type:application/json"
   })
   @PATCH("another-fake/dummy")
-  CompletionStage<Response<Client>> testSpecialTags(
+  CompletionStage<Response<Client>> call123testSpecialTags(
     @retrofit2.http.Body Client client
   );
 

samples/client/petstore/java/retrofit2/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/retrofit2/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -19,7 +19,7 @@ import java.util.Map;
 public interface AnotherFakeApi {
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Call<Client>
    */
@@ -27,7 +27,7 @@ public interface AnotherFakeApi {
     "Content-Type:application/json"
   })
   @PATCH("another-fake/dummy")
-  Call<Client> testSpecialTags(
+  Call<Client> call123testSpecialTags(
     @retrofit2.http.Body Client client
   );
 

samples/client/petstore/java/retrofit2rx/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/retrofit2rx/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -19,7 +19,7 @@ import java.util.Map;
 public interface AnotherFakeApi {
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Observable<Client>
    */
@@ -27,7 +27,7 @@ public interface AnotherFakeApi {
     "Content-Type:application/json"
   })
   @PATCH("another-fake/dummy")
-  Observable<Client> testSpecialTags(
+  Observable<Client> call123testSpecialTags(
     @retrofit2.http.Body Client client
   );
 

samples/client/petstore/java/retrofit2rx2/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/retrofit2rx2/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -20,7 +20,7 @@ import java.util.Map;
 public interface AnotherFakeApi {
   /**
    * To test special tags
-   * To test special tags
+   * To test special tags and operation ID starting with number
    * @param client client model (required)
    * @return Observable<Client>
    */
@@ -28,7 +28,7 @@ public interface AnotherFakeApi {
     "Content-Type:application/json"
   })
   @PATCH("another-fake/dummy")
-  Observable<Client> testSpecialTags(
+  Observable<Client> call123testSpecialTags(
     @retrofit2.http.Body Client client
   );
 

samples/client/petstore/java/vertx/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -9,6 +9,6 @@ import java.util.*;
 
 public interface AnotherFakeApi {
 
-    void testSpecialTags(Client client, Handler<AsyncResult<Client>> handler);
+    void call123testSpecialTags(Client client, Handler<AsyncResult<Client>> handler);
 
 }

samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/api/AnotherFakeApiImpl.java

@@ -39,16 +39,16 @@ public class AnotherFakeApiImpl implements AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @param resultHandler Asynchronous result handler
      */
-    public void testSpecialTags(Client client, Handler<AsyncResult<Client>> resultHandler) {
+    public void call123testSpecialTags(Client client, Handler<AsyncResult<Client>> resultHandler) {
         Object localVarBody = client;
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            resultHandler.handle(ApiException.fail(400, "Missing the required parameter 'client' when calling testSpecialTags"));
+            resultHandler.handle(ApiException.fail(400, "Missing the required parameter 'client' when calling call123testSpecialTags"));
             return;
         }
         

samples/client/petstore/java/vertx/src/main/java/org/openapitools/client/api/rxjava/AnotherFakeApi.java

@@ -23,23 +23,23 @@ public class AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @param resultHandler Asynchronous result handler
      */
-    public void testSpecialTags(Client client, Handler<AsyncResult<Client>> resultHandler) {
+    public void call123testSpecialTags(Client client, Handler<AsyncResult<Client>> resultHandler) {
-        delegate.testSpecialTags(client, resultHandler);
+        delegate.call123testSpecialTags(client, resultHandler);
     }
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * @param client client model (required)
      * @return Asynchronous result handler (RxJava Single)
      */
-    public Single<Client> rxTestSpecialTags(Client client) {
+    public Single<Client> rxCall123testSpecialTags(Client client) {
         return Single.create(new io.vertx.rx.java.SingleOnSubscribeAdapter<>(fut -> {
-            delegate.testSpecialTags(client, fut);
+            delegate.call123testSpecialTags(client, fut);
         }));
     }
 

samples/client/petstore/java/vertx/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -59,15 +59,15 @@ public class AnotherFakeApiTest {
     
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @param context Vertx test context for doing assertions
      */
     @Test
-    public void testSpecialTagsTest(TestContext context) {
+    public void call123testSpecialTagsTest(TestContext context) {
         Async async = context.async();
         Client client = null;
-        api.testSpecialTags(client, result -> {
+        api.call123testSpecialTags(client, result -> {
             // TODO: test validations
             async.complete();
         });

samples/client/petstore/java/webclient/docs/AnotherFakeApi.md

@@ -4,16 +4,16 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**call123testSpecialTags**](AnotherFakeApi.md#call123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-<a name="testSpecialTags"></a>
+<a name="call123testSpecialTags"></a>
-# **testSpecialTags**
+# **call123testSpecialTags**
-> Client testSpecialTags(client)
+> Client call123testSpecialTags(client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```java
@@ -25,10 +25,10 @@ To test special tags
 AnotherFakeApi apiInstance = new AnotherFakeApi();
 Client client = new Client(); // Client | client model
 try {
-    Client result = apiInstance.testSpecialTags(client);
+    Client result = apiInstance.call123testSpecialTags(client);
     System.out.println(result);
 } catch (ApiException e) {
-    System.err.println("Exception when calling AnotherFakeApi#testSpecialTags");
+    System.err.println("Exception when calling AnotherFakeApi#call123testSpecialTags");
     e.printStackTrace();
 }
 ```

samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/api/AnotherFakeApi.java

@@ -47,18 +47,18 @@ public class AnotherFakeApi {
 
     /**
      * To test special tags
-     * To test special tags
+     * To test special tags and operation ID starting with number
      * <p><b>200</b> - successful operation
      * @param client client model
      * @return Client
      * @throws RestClientException if an error occurs while attempting to invoke the API
      */
-    public Mono<Client> testSpecialTags(Client client) throws RestClientException {
+    public Mono<Client> call123testSpecialTags(Client client) throws RestClientException {
         Object postBody = client;
         
         // verify the required parameter 'client' is set
         if (client == null) {
-            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling testSpecialTags");
+            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'client' when calling call123testSpecialTags");
         }
         
         String path = UriComponentsBuilder.fromPath("/another-fake/dummy").build().toUriString();

samples/client/petstore/java/webclient/src/test/java/org/openapitools/client/api/AnotherFakeApiTest.java

@@ -35,15 +35,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() throws ApiException {
+    public void call123testSpecialTagsTest() throws ApiException {
         Client client = null;
-        Client response = api.testSpecialTags(client).block();
+        Client response = api.call123testSpecialTags(client).block();
 
         // TODO: test validations
     }

samples/client/petstore/php/OpenAPIClient-php/README.md

@@ -64,10 +64,10 @@ $apiInstance = new OpenAPI\Client\Api\AnotherFakeApi(
 $client = new \OpenAPI\Client\Model\Client(); // \OpenAPI\Client\Model\Client | client model
 
 try {
-    $result = $apiInstance->testSpecialTags($client);
+    $result = $apiInstance->123testSpecialTags($client);
     print_r($result);
 } catch (Exception $e) {
-    echo 'Exception when calling AnotherFakeApi->testSpecialTags: ', $e->getMessage(), PHP_EOL;
+    echo 'Exception when calling AnotherFakeApi->123testSpecialTags: ', $e->getMessage(), PHP_EOL;
 }
 
 ?>
@@ -79,7 +79,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*AnotherFakeApi* | [**testSpecialTags**](docs/Api/AnotherFakeApi.md#testspecialtags) | **PATCH** /another-fake/dummy | To test special tags
+*AnotherFakeApi* | [**123testSpecialTags**](docs/Api/AnotherFakeApi.md#123testspecialtags) | **PATCH** /another-fake/dummy | To test special tags
 *FakeApi* | [**fakeOuterBooleanSerialize**](docs/Api/FakeApi.md#fakeouterbooleanserialize) | **POST** /fake/outer/boolean | 
 *FakeApi* | [**fakeOuterCompositeSerialize**](docs/Api/FakeApi.md#fakeoutercompositeserialize) | **POST** /fake/outer/composite | 
 *FakeApi* | [**fakeOuterNumberSerialize**](docs/Api/FakeApi.md#fakeouternumberserialize) | **POST** /fake/outer/number | 

samples/client/petstore/php/OpenAPIClient-php/docs/Api/AnotherFakeApi.md

@@ -4,15 +4,15 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**123testSpecialTags**](AnotherFakeApi.md#123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-# **testSpecialTags**
+# **123testSpecialTags**
-> \OpenAPI\Client\Model\Client testSpecialTags($client)
+> \OpenAPI\Client\Model\Client 123testSpecialTags($client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```php
@@ -27,10 +27,10 @@ $apiInstance = new OpenAPI\Client\Api\AnotherFakeApi(
 $client = new \OpenAPI\Client\Model\Client(); // \OpenAPI\Client\Model\Client | client model
 
 try {
-    $result = $apiInstance->testSpecialTags($client);
+    $result = $apiInstance->123testSpecialTags($client);
     print_r($result);
 } catch (Exception $e) {
-    echo 'Exception when calling AnotherFakeApi->testSpecialTags: ', $e->getMessage(), PHP_EOL;
+    echo 'Exception when calling AnotherFakeApi->123testSpecialTags: ', $e->getMessage(), PHP_EOL;
 }
 ?>
 ```

samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php

@@ -88,7 +88,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTags
+     * Operation 123testSpecialTags
      *
      * To test special tags
      *
@@ -98,14 +98,14 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \OpenAPI\Client\Model\Client
      */
-    public function testSpecialTags($client)
+    public function 123testSpecialTags($client)
     {
-        list($response) = $this->testSpecialTagsWithHttpInfo($client);
+        list($response) = $this->123testSpecialTagsWithHttpInfo($client);
         return $response;
     }
 
     /**
-     * Operation testSpecialTagsWithHttpInfo
+     * Operation 123testSpecialTagsWithHttpInfo
      *
      * To test special tags
      *
@@ -115,9 +115,9 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return array of \OpenAPI\Client\Model\Client, HTTP status code, HTTP response headers (array of strings)
      */
-    public function testSpecialTagsWithHttpInfo($client)
+    public function 123testSpecialTagsWithHttpInfo($client)
     {
-        $request = $this->testSpecialTagsRequest($client);
+        $request = $this->123testSpecialTagsRequest($client);
 
         try {
             $options = $this->createHttpClientOption();
@@ -199,7 +199,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTagsAsync
+     * Operation 123testSpecialTagsAsync
      *
      * To test special tags
      *
@@ -208,9 +208,9 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function testSpecialTagsAsync($client)
+    public function 123testSpecialTagsAsync($client)
     {
-        return $this->testSpecialTagsAsyncWithHttpInfo($client)
+        return $this->123testSpecialTagsAsyncWithHttpInfo($client)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -219,7 +219,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTagsAsyncWithHttpInfo
+     * Operation 123testSpecialTagsAsyncWithHttpInfo
      *
      * To test special tags
      *
@@ -228,10 +228,10 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function testSpecialTagsAsyncWithHttpInfo($client)
+    public function 123testSpecialTagsAsyncWithHttpInfo($client)
     {
         $returnType = '\OpenAPI\Client\Model\Client';
-        $request = $this->testSpecialTagsRequest($client);
+        $request = $this->123testSpecialTagsRequest($client);
 
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
@@ -271,19 +271,19 @@ class AnotherFakeApi
     }
 
     /**
-     * Create request for operation 'testSpecialTags'
+     * Create request for operation '123testSpecialTags'
      *
      * @param  \OpenAPI\Client\Model\Client $client client model (required)
      *
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request
      */
-    protected function testSpecialTagsRequest($client)
+    protected function 123testSpecialTagsRequest($client)
     {
         // verify the required parameter 'client' is set
         if ($client === null || (is_array($client) && count($client) === 0)) {
             throw new \InvalidArgumentException(
-                'Missing the required parameter $client when calling testSpecialTags'
+                'Missing the required parameter $client when calling 123testSpecialTags'
             );
         }
 

samples/client/petstore/php/OpenAPIClient-php/test/Api/AnotherFakeApiTest.php

@@ -72,12 +72,12 @@ class AnotherFakeApiTest extends \PHPUnit_Framework_TestCase
     }
 
     /**
-     * Test case for testSpecialTags
+     * Test case for 123testSpecialTags
      *
      * To test special tags.
      *
      */
-    public function testTestSpecialTags()
+    public function test123testSpecialTags()
     {
     }
 }

samples/openapi3/client/petstore/php/OpenAPIClient-php/README.md

@@ -64,10 +64,10 @@ $apiInstance = new OpenAPI\Client\Api\AnotherFakeApi(
 $client = new \OpenAPI\Client\Model\Client(); // \OpenAPI\Client\Model\Client | client model
 
 try {
-    $result = $apiInstance->testSpecialTags($client);
+    $result = $apiInstance->123testSpecialTags($client);
     print_r($result);
 } catch (Exception $e) {
-    echo 'Exception when calling AnotherFakeApi->testSpecialTags: ', $e->getMessage(), PHP_EOL;
+    echo 'Exception when calling AnotherFakeApi->123testSpecialTags: ', $e->getMessage(), PHP_EOL;
 }
 
 ?>
@@ -79,7 +79,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*AnotherFakeApi* | [**testSpecialTags**](docs/Api/AnotherFakeApi.md#testspecialtags) | **PATCH** /another-fake/dummy | To test special tags
+*AnotherFakeApi* | [**123testSpecialTags**](docs/Api/AnotherFakeApi.md#123testspecialtags) | **PATCH** /another-fake/dummy | To test special tags
 *FakeApi* | [**fakeOuterBooleanSerialize**](docs/Api/FakeApi.md#fakeouterbooleanserialize) | **POST** /fake/outer/boolean | 
 *FakeApi* | [**fakeOuterCompositeSerialize**](docs/Api/FakeApi.md#fakeoutercompositeserialize) | **POST** /fake/outer/composite | 
 *FakeApi* | [**fakeOuterNumberSerialize**](docs/Api/FakeApi.md#fakeouternumberserialize) | **POST** /fake/outer/number | 

samples/openapi3/client/petstore/php/OpenAPIClient-php/docs/Api/AnotherFakeApi.md

@@ -4,15 +4,15 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
-[**testSpecialTags**](AnotherFakeApi.md#testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
+[**123testSpecialTags**](AnotherFakeApi.md#123testSpecialTags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-# **testSpecialTags**
+# **123testSpecialTags**
-> \OpenAPI\Client\Model\Client testSpecialTags($client)
+> \OpenAPI\Client\Model\Client 123testSpecialTags($client)
 
 To test special tags
 
-To test special tags
+To test special tags and operation ID starting with number
 
 ### Example
 ```php
@@ -27,10 +27,10 @@ $apiInstance = new OpenAPI\Client\Api\AnotherFakeApi(
 $client = new \OpenAPI\Client\Model\Client(); // \OpenAPI\Client\Model\Client | client model
 
 try {
-    $result = $apiInstance->testSpecialTags($client);
+    $result = $apiInstance->123testSpecialTags($client);
     print_r($result);
 } catch (Exception $e) {
-    echo 'Exception when calling AnotherFakeApi->testSpecialTags: ', $e->getMessage(), PHP_EOL;
+    echo 'Exception when calling AnotherFakeApi->123testSpecialTags: ', $e->getMessage(), PHP_EOL;
 }
 ?>
 ```

samples/openapi3/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php

@@ -88,7 +88,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTags
+     * Operation 123testSpecialTags
      *
      * To test special tags
      *
@@ -98,14 +98,14 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \OpenAPI\Client\Model\Client
      */
-    public function testSpecialTags($client)
+    public function 123testSpecialTags($client)
     {
-        list($response) = $this->testSpecialTagsWithHttpInfo($client);
+        list($response) = $this->123testSpecialTagsWithHttpInfo($client);
         return $response;
     }
 
     /**
-     * Operation testSpecialTagsWithHttpInfo
+     * Operation 123testSpecialTagsWithHttpInfo
      *
      * To test special tags
      *
@@ -115,9 +115,9 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return array of \OpenAPI\Client\Model\Client, HTTP status code, HTTP response headers (array of strings)
      */
-    public function testSpecialTagsWithHttpInfo($client)
+    public function 123testSpecialTagsWithHttpInfo($client)
     {
-        $request = $this->testSpecialTagsRequest($client);
+        $request = $this->123testSpecialTagsRequest($client);
 
         try {
             $options = $this->createHttpClientOption();
@@ -199,7 +199,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTagsAsync
+     * Operation 123testSpecialTagsAsync
      *
      * To test special tags
      *
@@ -208,9 +208,9 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function testSpecialTagsAsync($client)
+    public function 123testSpecialTagsAsync($client)
     {
-        return $this->testSpecialTagsAsyncWithHttpInfo($client)
+        return $this->123testSpecialTagsAsyncWithHttpInfo($client)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -219,7 +219,7 @@ class AnotherFakeApi
     }
 
     /**
-     * Operation testSpecialTagsAsyncWithHttpInfo
+     * Operation 123testSpecialTagsAsyncWithHttpInfo
      *
      * To test special tags
      *
@@ -228,10 +228,10 @@ class AnotherFakeApi
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function testSpecialTagsAsyncWithHttpInfo($client)
+    public function 123testSpecialTagsAsyncWithHttpInfo($client)
     {
         $returnType = '\OpenAPI\Client\Model\Client';
-        $request = $this->testSpecialTagsRequest($client);
+        $request = $this->123testSpecialTagsRequest($client);
 
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
@@ -271,19 +271,19 @@ class AnotherFakeApi
     }
 
     /**
-     * Create request for operation 'testSpecialTags'
+     * Create request for operation '123testSpecialTags'
      *
      * @param  \OpenAPI\Client\Model\Client $client client model (required)
      *
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request
      */
-    protected function testSpecialTagsRequest($client)
+    protected function 123testSpecialTagsRequest($client)
     {
         // verify the required parameter 'client' is set
         if ($client === null || (is_array($client) && count($client) === 0)) {
             throw new \InvalidArgumentException(
-                'Missing the required parameter $client when calling testSpecialTags'
+                'Missing the required parameter $client when calling 123testSpecialTags'
             );
         }
 

samples/openapi3/client/petstore/php/OpenAPIClient-php/test/Api/AnotherFakeApiTest.php

@@ -72,12 +72,12 @@ class AnotherFakeApiTest extends \PHPUnit_Framework_TestCase
     }
 
     /**
-     * Test case for testSpecialTags
+     * Test case for 123testSpecialTags
      *
      * To test special tags.
      *
      */
-    public function testTestSpecialTags()
+    public function test123testSpecialTags()
     {
     }
 }

samples/server/petstore/jaxrs-cxf/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -32,7 +32,7 @@ public interface AnotherFakeApi  {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      */
     @PATCH
@@ -42,6 +42,6 @@ public interface AnotherFakeApi  {
     @ApiOperation(value = "To test special tags", tags={ "$another-fake?" })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Client testSpecialTags(@Valid Client client);
+    public Client call123testSpecialTags(@Valid Client client);
 }
 

samples/server/petstore/jaxrs-cxf/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -26,10 +26,10 @@ public class AnotherFakeApiServiceImpl implements AnotherFakeApi {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      */
-    public Client testSpecialTags(Client client) {
+    public Client call123testSpecialTags(Client client) {
         // TODO: Implement...
         
         return null;

samples/server/petstore/jaxrs-cxf/src/test/java/org/openapitools/api/AnotherFakeApiTest.java

@@ -74,15 +74,15 @@ public class AnotherFakeApiTest {
     /**
      * To test special tags
      *
-     * To test special tags
+     * To test special tags and operation ID starting with number
      *
      * @throws ApiException
      *          if the Api call fails
      */
     @Test
-    public void testSpecialTagsTest() {
+    public void call123testSpecialTagsTest() {
         Client client = null;
-        //Client response = api.testSpecialTags(client);
+        //Client response = api.call123testSpecialTags(client);
         //assertNotNull(response);
         // TODO: test validations
         

samples/server/petstore/jaxrs-datelib-j8/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -58,12 +58,12 @@ public class AnotherFakeApi  {
     @Path("/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @io.swagger.annotations.ApiResponses(value = { 
         @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Response testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
+    public Response call123testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
 ,@Context SecurityContext securityContext)
     throws NotFoundException {
-        return delegate.testSpecialTags(client,securityContext);
+        return delegate.call123testSpecialTags(client,securityContext);
     }
 }

samples/server/petstore/jaxrs-datelib-j8/src/gen/java/org/openapitools/api/AnotherFakeApiService.java

@@ -17,5 +17,5 @@ import javax.ws.rs.core.SecurityContext;
 import javax.validation.constraints.*;
 
 public abstract class AnotherFakeApiService {
-    public abstract Response testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
+    public abstract Response call123testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
 }

samples/server/petstore/jaxrs-datelib-j8/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -18,7 +18,7 @@ import javax.validation.constraints.*;
 
 public class AnotherFakeApiServiceImpl extends AnotherFakeApiService {
     @Override
-    public Response testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
+    public Response call123testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
         // do some magic!
         return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();
     }

samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -20,8 +20,8 @@ public interface AnotherFakeApi {
     @Path("/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @ApiOperation(value = "To test special tags", notes = "To test special tags", tags={ "$another-fake?" })
+    @ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", tags={ "$another-fake?" })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    Client testSpecialTags(@Valid Client client);
+    Client call123testSpecialTags(@Valid Client client);
 }

samples/server/petstore/jaxrs-spec-interface/src/main/openapi/openapi.yaml

@@ -1016,8 +1016,8 @@ paths:
       - tag: fake
   /another-fake/dummy:
     patch:
-      description: To test special tags
+      description: To test special tags and operation ID starting with number
-      operationId: test_special_tags
+      operationId: 123_test_@#$%_special_tags
       requestBody:
         content:
           application/json:

samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -20,11 +20,11 @@ public class AnotherFakeApi {
     @Path("/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?" })
+    @ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?" })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class)
     })
-    public Response testSpecialTags(@Valid Client client) {
+    public Response call123testSpecialTags(@Valid Client client) {
         return Response.ok().entity("magic!").build();
     }
 }

samples/server/petstore/jaxrs-spec/src/main/openapi/openapi.yaml

@@ -1016,8 +1016,8 @@ paths:
       - tag: fake
   /another-fake/dummy:
     patch:
-      description: To test special tags
+      description: To test special tags and operation ID starting with number
-      operationId: test_special_tags
+      operationId: 123_test_@#$%_special_tags
       requestBody:
         content:
           application/json:

samples/server/petstore/jaxrs/jersey1-useTags/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -38,13 +38,13 @@ public class AnotherFakeApi  {
     @Path("/another-fake/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?" })
+    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?" })
     @io.swagger.annotations.ApiResponses(value = { 
         @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Response testSpecialTags(
+    public Response call123testSpecialTags(
         @ApiParam(value = "client model" ,required=true) Client client,
         @Context SecurityContext securityContext)
     throws NotFoundException {
-        return delegate.testSpecialTags(client,securityContext);
+        return delegate.call123testSpecialTags(client,securityContext);
     }
 }

samples/server/petstore/jaxrs/jersey1-useTags/src/gen/java/org/openapitools/api/AnotherFakeApiService.java

@@ -20,6 +20,6 @@ import javax.ws.rs.core.SecurityContext;
 import javax.validation.constraints.*;
 
 public abstract class AnotherFakeApiService {
-      public abstract Response testSpecialTags(Client client,SecurityContext securityContext)
+      public abstract Response call123testSpecialTags(Client client,SecurityContext securityContext)
       throws NotFoundException;
 }

samples/server/petstore/jaxrs/jersey1-useTags/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -21,7 +21,7 @@ import javax.validation.constraints.*;
 
 public class AnotherFakeApiServiceImpl extends AnotherFakeApiService {
     @Override
-    public Response testSpecialTags(Client client, SecurityContext securityContext)
+    public Response call123testSpecialTags(Client client, SecurityContext securityContext)
     throws NotFoundException {
         // do some magic!
         return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();

samples/server/petstore/jaxrs/jersey1/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -38,13 +38,13 @@ public class AnotherFakeApi  {
     @Path("/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?" })
+    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?" })
     @io.swagger.annotations.ApiResponses(value = { 
         @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Response testSpecialTags(
+    public Response call123testSpecialTags(
         @ApiParam(value = "client model" ,required=true) Client client,
         @Context SecurityContext securityContext)
     throws NotFoundException {
-        return delegate.testSpecialTags(client,securityContext);
+        return delegate.call123testSpecialTags(client,securityContext);
     }
 }

samples/server/petstore/jaxrs/jersey1/src/gen/java/org/openapitools/api/AnotherFakeApiService.java

@@ -20,6 +20,6 @@ import javax.ws.rs.core.SecurityContext;
 import javax.validation.constraints.*;
 
 public abstract class AnotherFakeApiService {
-      public abstract Response testSpecialTags(Client client,SecurityContext securityContext)
+      public abstract Response call123testSpecialTags(Client client,SecurityContext securityContext)
       throws NotFoundException;
 }

samples/server/petstore/jaxrs/jersey1/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -21,7 +21,7 @@ import javax.validation.constraints.*;
 
 public class AnotherFakeApiServiceImpl extends AnotherFakeApiService {
     @Override
-    public Response testSpecialTags(Client client, SecurityContext securityContext)
+    public Response call123testSpecialTags(Client client, SecurityContext securityContext)
     throws NotFoundException {
         // do some magic!
         return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();

samples/server/petstore/jaxrs/jersey2-useTags/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -58,12 +58,12 @@ public class AnotherFakeApi  {
     @Path("/another-fake/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @io.swagger.annotations.ApiResponses(value = { 
         @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Response testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
+    public Response call123testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
 ,@Context SecurityContext securityContext)
     throws NotFoundException {
-        return delegate.testSpecialTags(client,securityContext);
+        return delegate.call123testSpecialTags(client,securityContext);
     }
 }

samples/server/petstore/jaxrs/jersey2-useTags/src/gen/java/org/openapitools/api/AnotherFakeApiService.java

@@ -17,5 +17,5 @@ import javax.ws.rs.core.SecurityContext;
 import javax.validation.constraints.*;
 
 public abstract class AnotherFakeApiService {
-    public abstract Response testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
+    public abstract Response call123testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
 }

samples/server/petstore/jaxrs/jersey2-useTags/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -18,7 +18,7 @@ import javax.validation.constraints.*;
 
 public class AnotherFakeApiServiceImpl extends AnotherFakeApiService {
     @Override
-    public Response testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
+    public Response call123testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
         // do some magic!
         return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();
     }

samples/server/petstore/jaxrs/jersey2/src/gen/java/org/openapitools/api/AnotherFakeApi.java

@@ -58,12 +58,12 @@ public class AnotherFakeApi  {
     @Path("/dummy")
     @Consumes({ "application/json" })
     @Produces({ "application/json" })
-    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @io.swagger.annotations.ApiOperation(value = "To test special tags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @io.swagger.annotations.ApiResponses(value = { 
         @io.swagger.annotations.ApiResponse(code = 200, message = "successful operation", response = Client.class) })
-    public Response testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
+    public Response call123testSpecialTags(@ApiParam(value = "client model" ,required=true) Client client
 ,@Context SecurityContext securityContext)
     throws NotFoundException {
-        return delegate.testSpecialTags(client,securityContext);
+        return delegate.call123testSpecialTags(client,securityContext);
     }
 }

samples/server/petstore/jaxrs/jersey2/src/gen/java/org/openapitools/api/AnotherFakeApiService.java

@@ -17,5 +17,5 @@ import javax.ws.rs.core.SecurityContext;
 import javax.validation.constraints.*;
 
 public abstract class AnotherFakeApiService {
-    public abstract Response testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
+    public abstract Response call123testSpecialTags(Client client,SecurityContext securityContext) throws NotFoundException;
 }

samples/server/petstore/jaxrs/jersey2/src/main/java/org/openapitools/api/impl/AnotherFakeApiServiceImpl.java

@@ -18,7 +18,7 @@ import javax.validation.constraints.*;
 
 public class AnotherFakeApiServiceImpl extends AnotherFakeApiService {
     @Override
-    public Response testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
+    public Response call123testSpecialTags(Client client, SecurityContext securityContext) throws NotFoundException {
         // do some magic!
         return Response.ok().entity(new ApiResponseMessage(ApiResponseMessage.OK, "magic!")).build();
     }

samples/server/petstore/php-lumen/lib/app/Http/Controllers/AnotherFakeApi.php

@@ -27,14 +27,14 @@ class AnotherFakeApi extends Controller
     }
 
     /**
-     * Operation testSpecialTags
+     * Operation 123testSpecialTags
      *
      * To test special tags.
      *
      *
      * @return Http response
      */
-    public function testSpecialTags()
+    public function 123testSpecialTags()
     {
         $input = Request::all();
 
@@ -43,11 +43,11 @@ class AnotherFakeApi extends Controller
 
         //not path params validation
         if (!isset($input['client'])) {
-            throw new \InvalidArgumentException('Missing the required parameter $client when calling testSpecialTags');
+            throw new \InvalidArgumentException('Missing the required parameter $client when calling 123testSpecialTags');
         }
         $client = $input['client'];
 
 
-        return response('How about implementing testSpecialTags as a patch method ?');
+        return response('How about implementing 123testSpecialTags as a patch method ?');
     }
 }

samples/server/petstore/php-lumen/lib/app/Http/routes.php

@@ -22,12 +22,12 @@ $app->get('/', function () use ($app) {
 });
 
 /**
- * patch testSpecialTags
+ * patch 123testSpecialTags
  * Summary: To test special tags
- * Notes: To test special tags
+ * Notes: To test special tags and operation ID starting with number
  * Output-Formats: [application/json]
  */
-$app->patch('/v2/another-fake/dummy', 'AnotherFakeApi@testSpecialTags');
+$app->patch('/v2/another-fake/dummy', 'AnotherFakeApi@123testSpecialTags');
 /**
  * patch testClientModel
  * Summary: To test \"client\" model

samples/server/petstore/php-slim/lib/Api/AnotherFakeApi.php

@@ -40,18 +40,18 @@ use OpenAPIServer\AbstractApiController;
 class AnotherFakeApi extends AbstractApiController {
 
     /**
-     * PATCH testSpecialTags
+     * PATCH 123testSpecialTags
      * Summary: To test special tags
-     * Notes: To test special tags
+     * Notes: To test special tags and operation ID starting with number
      * Output-Formats: [application/json]
      *
      * @param \Psr\Http\Message\ServerRequestInterface $request  Request
      * @param \Psr\Http\Message\ResponseInterface      $response Response
      * @param array|null                               $args     Path arguments
      */
-    public function testSpecialTags($request, $response, $args) {
+    public function 123testSpecialTags($request, $response, $args) {
         $body = $request->getParsedBody();
-        $response->write('How about implementing testSpecialTags as a PATCH method ?');
+        $response->write('How about implementing 123testSpecialTags as a PATCH method ?');
         return $response;
     }
     

samples/server/petstore/php-slim/lib/SlimRouter.php

@@ -72,7 +72,7 @@ class SlimRouter {
         ]);
 
         $app->PATCH(
-            '/v2/another-fake/dummy', AnotherFakeApi::class . ':testSpecialTags'
+            '/v2/another-fake/dummy', AnotherFakeApi::class . ':123testSpecialTags'
         );
         $app->POST(
             '/v2/fake/outer/boolean', FakeApi::class . ':fakeOuterBooleanSerialize'

samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/api/AnotherFakeApi.java

@@ -36,14 +36,14 @@ public interface AnotherFakeApi {
         return Optional.empty();
     }
 
-    @ApiOperation(value = "To test special tags", nickname = "testSpecialTags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @ApiOperation(value = "To test special tags", nickname = "call123testSpecialTags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class) })
     @RequestMapping(value = "/another-fake/dummy",
         produces = { "application/json" }, 
         consumes = { "application/json" },
         method = RequestMethod.PATCH)
-    default CompletableFuture<ResponseEntity<Client>> testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client) {
+    default CompletableFuture<ResponseEntity<Client>> call123testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client) {
         return CompletableFuture.supplyAsync(()-> {
             getRequest().ifPresent(request -> {
                 for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {

samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/api/AnotherFakeApi.java

@@ -35,14 +35,14 @@ public interface AnotherFakeApi {
         return Optional.empty();
     }
 
-    @ApiOperation(value = "To test special tags", nickname = "testSpecialTags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @ApiOperation(value = "To test special tags", nickname = "call123testSpecialTags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class) })
     @RequestMapping(value = "/another-fake/dummy",
         produces = { "application/json" }, 
         consumes = { "application/json" },
         method = RequestMethod.PATCH)
-    default ResponseEntity<Client> testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client) {
+    default ResponseEntity<Client> call123testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client) {
         getRequest().ifPresent(request -> {
             for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {

samples/server/petstore/spring-mvc/src/main/java/org/openapitools/api/AnotherFakeApi.java

@@ -27,13 +27,13 @@ import java.util.Map;
 @Api(value = "another-fake", description = "the another-fake API")
 public interface AnotherFakeApi {
 
-    @ApiOperation(value = "To test special tags", nickname = "testSpecialTags", notes = "To test special tags", response = Client.class, tags={ "$another-fake?", })
+    @ApiOperation(value = "To test special tags", nickname = "call123testSpecialTags", notes = "To test special tags and operation ID starting with number", response = Client.class, tags={ "$another-fake?", })
     @ApiResponses(value = { 
         @ApiResponse(code = 200, message = "successful operation", response = Client.class) })
     @RequestMapping(value = "/another-fake/dummy",
         produces = { "application/json" }, 
         consumes = { "application/json" },
         method = RequestMethod.PATCH)
-    ResponseEntity<Client> testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client);
+    ResponseEntity<Client> call123testSpecialTags(@ApiParam(value = "client model" ,required=true )  @Valid @RequestBody Client client);
 
 }