Added a property to the Spring generator to avoid the use of the ResponseEntity type (#11537)

* Added the useResponseEntity additional parameter for Spring generator

* Changed the mustache templates using the new useResponseEntity property

* Added the new property to the documentation

* Merging with remote master

* #11537 Added missing configuration for the delegate pattern case

* #11537 Added autogenerated @ResponseStatus on Spring methods

* #11537 Fixed borsch comments

* #11537 Added the default 200 HTTP Status for empty response HTTP code

* [Java][Spring] useResponseEntity sample + remove blank line

* [Java][Spring] useResponseEntity sample + remove blank line

* [Java][Spring] useResponseEntity sample + remove blank line

---------

Co-authored-by: Oleh Kurpiak <oleh.kurpiak@gmail.com>

.github/workflows/samples-spring.yaml

@@ -36,6 +36,7 @@ jobs:
           - samples/server/petstore/springboot-implicitHeaders
           - samples/openapi3/server/petstore/springboot-implicitHeaders
           - samples/server/petstore/springboot-delegate
+          - samples/server/petstore/springboot-delegate-no-response-entity
           - samples/openapi3/server/petstore/springboot-delegate
           - samples/server/petstore/spring-boot-nullable-set
           - samples/server/petstore/spring-boot-defaultInterface-unhandledException

bin/configs/spring-boot-delegate-no-response-entity.yaml

@@ -0,0 +1,11 @@
+generatorName: spring
+outputDir: samples/server/petstore/springboot-delegate-no-response-entity
+inputSpec: modules/openapi-generator/src/test/resources/3_0/petstore.yaml
+templateDir: modules/openapi-generator/src/main/resources/JavaSpring
+additionalProperties:
+  documentationProvider: springfox
+  artifactId: springboot-delegate-no-response-entity
+  hideGenerationTimestamp: "true"
+  java8: true
+  delegatePattern: "true"
+  useResponseEntity: "false"

docs/generators/java-camel.md

@@ -97,6 +97,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |useFeignClientUrl|Whether to generate Feign client with url parameter.| |true|
 |useJakartaEe|whether to use Jakarta EE namespace instead of javax| |false|
 |useOptional|Use Optional container for optional parameters| |false|
+|useResponseEntity|Use the `ResponseEntity` type to wrap return values of generated API methods. If disabled, method are annotated using a `@ResponseStatus` annotation, which has the status of the first response declared in the Api definition| |true|
 |useSpringBoot3|Generate code and provide dependencies for use with Spring Boot 3.x. (Use jakarta instead of javax in imports). Enabling this option will also enable `useJakartaEe`.| |false|
 |useSpringController|Annotate the generated API as a Spring Controller| |false|
 |useSwaggerUI|Open the OpenApi specification in swagger-ui. Will also import and configure needed dependencies| |true|

docs/generators/spring.md

@@ -90,6 +90,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |useFeignClientUrl|Whether to generate Feign client with url parameter.| |true|
 |useJakartaEe|whether to use Jakarta EE namespace instead of javax| |false|
 |useOptional|Use Optional container for optional parameters| |false|
+|useResponseEntity|Use the `ResponseEntity` type to wrap return values of generated API methods. If disabled, method are annotated using a `@ResponseStatus` annotation, which has the status of the first response declared in the Api definition| |true|
 |useSpringBoot3|Generate code and provide dependencies for use with Spring Boot 3.x. (Use jakarta instead of javax in imports). Enabling this option will also enable `useJakartaEe`.| |false|
 |useSpringController|Annotate the generated API as a Spring Controller| |false|
 |useSwaggerUI|Open the OpenApi specification in swagger-ui. Will also import and configure needed dependencies| |true|

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

@@ -65,6 +65,7 @@ import org.openapitools.codegen.model.ModelsMap;
 import org.openapitools.codegen.model.OperationMap;
 import org.openapitools.codegen.model.OperationsMap;
 import org.openapitools.codegen.templating.mustache.SplitStringLambda;
+import org.openapitools.codegen.templating.mustache.SpringHttpStatusLambda;
 import org.openapitools.codegen.templating.mustache.TrimWhitespaceLambda;
 import org.openapitools.codegen.utils.URLPathUtils;
 import org.slf4j.Logger;
@@ -110,6 +111,7 @@ public class SpringCodegen extends AbstractJavaCodegen
     public static final String HATEOAS = "hateoas";
     public static final String RETURN_SUCCESS_CODE = "returnSuccessCode";
     public static final String UNHANDLED_EXCEPTION_HANDLING = "unhandledException";
+    public static final String USE_RESPONSE_ENTITY = "useResponseEntity";
     public static final String USE_SPRING_BOOT3 = "useSpringBoot3";
     public static final String REQUEST_MAPPING_OPTION = "requestMappingMode";
     public static final String USE_REQUEST_MAPPING_ON_CONTROLLER = "useRequestMappingOnController";
@@ -157,6 +159,7 @@ public class SpringCodegen extends AbstractJavaCodegen
     protected boolean unhandledException = false;
     protected boolean useSpringController = false;
     protected boolean useSwaggerUI = true;
+    protected boolean useResponseEntity = true;
     protected boolean useSpringBoot3 = false;
     protected boolean generatedConstructorWithRequiredArgs = true;
     protected RequestMappingMode requestMappingMode = RequestMappingMode.controller;
@@ -247,6 +250,10 @@ public class SpringCodegen extends AbstractJavaCodegen
         cliOptions.add(CliOption.newBoolean(USE_SWAGGER_UI,
             "Open the OpenApi specification in swagger-ui. Will also import and configure needed dependencies",
             useSwaggerUI));
+        cliOptions.add(CliOption.newBoolean(USE_RESPONSE_ENTITY,
+                "Use the `ResponseEntity` type to wrap return values of generated API methods. "
+                    + "If disabled, method are annotated using a `@ResponseStatus` annotation, which has the status of the first response declared in the Api definition",
+                useResponseEntity));
         cliOptions.add(CliOption.newBoolean(USE_SPRING_BOOT3,
             "Generate code and provide dependencies for use with Spring Boot 3.x. (Use jakarta instead of javax in imports). Enabling this option will also enable `useJakartaEe`.",
             useSpringBoot3));
@@ -487,6 +494,13 @@ public class SpringCodegen extends AbstractJavaCodegen
         }
         additionalProperties.put(UNHANDLED_EXCEPTION_HANDLING, this.isUnhandledException());
 
+        if (additionalProperties.containsKey(USE_RESPONSE_ENTITY)) {
+            this.setUseResponseEntity(
+                    Boolean.parseBoolean(additionalProperties.get(USE_RESPONSE_ENTITY).toString()));
+        }
+        writePropertyBack(USE_RESPONSE_ENTITY, useResponseEntity);
+        additionalProperties.put("springHttpStatus", new SpringHttpStatusLambda());
+
         if (additionalProperties.containsKey(USE_SPRING_BOOT3)) {
             this.setUseSpringBoot3(convertPropertyToBoolean(USE_SPRING_BOOT3));
         }
@@ -503,6 +517,7 @@ public class SpringCodegen extends AbstractJavaCodegen
         }
         writePropertyBack(USE_SPRING_BOOT3, isUseSpringBoot3());
 
+
         typeMapping.put("file", "org.springframework.core.io.Resource");
         importMapping.put("org.springframework.core.io.Resource", "org.springframework.core.io.Resource");
         importMapping.put("Pageable", "org.springframework.data.domain.Pageable");
@@ -1028,6 +1043,10 @@ public class SpringCodegen extends AbstractJavaCodegen
         this.unhandledException = unhandledException;
     }
 
+    public void setUseResponseEntity(boolean useResponseEntity) {
+        this.useResponseEntity = useResponseEntity;
+    }
+
     @Override
     public void postProcessModelProperty(CodegenModel model, CodegenProperty property) {
         super.postProcessModelProperty(model, property);

modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/SpringHttpStatusLambda.java

@@ -0,0 +1,220 @@
+package org.openapitools.codegen.templating.mustache;
+
+import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Template;
+
+import java.io.IOException;
+import java.io.Writer;
+
+/**
+ * Returns the Spring {@code org.springframework.http.HttpStatus} enumeration for the given status text.
+ * It throws an IllegalArgumentException if the status text is handled by the Spring framework.
+ *
+ * Register:
+ * <pre>
+ * additionalProperties.put("springHttpStatus", new SpringHttpStatusLambda());
+ * </pre>
+ *
+ * Use:
+ * <pre>
+ * {{#springHttpStatus}}{{statusCode}}{{/springHttpStatus}}
+ * </pre>
+ */
+public class SpringHttpStatusLambda implements Mustache.Lambda {
+
+    final static String HTTP_STATUS_PREFIX = "HttpStatus.";
+
+    @Override
+    public void execute(Template.Fragment fragment, Writer writer) throws IOException {
+        final String httpCode = fragment.execute();
+        switch (httpCode) {
+            case "202":
+                writer.write(HTTP_STATUS_PREFIX + "ACCEPTED");
+                break;
+            case "208":
+                writer.write(HTTP_STATUS_PREFIX + "ALREADY_REPORTED");
+                break;
+            case "502":
+                writer.write(HTTP_STATUS_PREFIX + "BAD_GATEWAY");
+                break;
+            case "400":
+                writer.write(HTTP_STATUS_PREFIX + "BAD_REQUEST");
+                break;
+            case "509":
+                writer.write(HTTP_STATUS_PREFIX + "BANDWIDTH_LIMIT_EXCEEDED");
+                break;
+            case "409":
+                writer.write(HTTP_STATUS_PREFIX + "CONFLICT");
+                break;
+            case "100":
+                writer.write(HTTP_STATUS_PREFIX + "CONTINUE");
+                break;
+            case "201":
+                writer.write(HTTP_STATUS_PREFIX + "CREATED");
+                break;
+            case "103":
+                writer.write(HTTP_STATUS_PREFIX + "EARLY_HINTS");
+                break;
+            case "417":
+                writer.write(HTTP_STATUS_PREFIX + "EXPECTATION_FAILED");
+                break;
+            case "424":
+                writer.write(HTTP_STATUS_PREFIX + "FAILED_DEPENDENCY");
+                break;
+            case "403":
+                writer.write(HTTP_STATUS_PREFIX + "FORBIDDEN");
+                break;
+            case "302":
+                writer.write(HTTP_STATUS_PREFIX + "FOUND");
+                break;
+            case "504":
+                writer.write(HTTP_STATUS_PREFIX + "GATEWAY_TIMEOUT");
+                break;
+            case "410":
+                writer.write(HTTP_STATUS_PREFIX + "GONE");
+                break;
+            case "505":
+                writer.write(HTTP_STATUS_PREFIX + "HTTP_VERSION_NOT_SUPPORTED");
+                break;
+            case "418":
+                writer.write(HTTP_STATUS_PREFIX + "I_AM_A_TEAPOT");
+                break;
+            case "226":
+                writer.write(HTTP_STATUS_PREFIX + "IM_USED");
+                break;
+            case "507":
+                writer.write(HTTP_STATUS_PREFIX + "INSUFFICIENT_STORAGE");
+                break;
+            case "500":
+                writer.write(HTTP_STATUS_PREFIX + "INTERNAL_SERVER_ERROR");
+                break;
+            case "411":
+                writer.write(HTTP_STATUS_PREFIX + "LENGTH_REQUIRED");
+                break;
+            case "423":
+                writer.write(HTTP_STATUS_PREFIX + "LOCKED");
+                break;
+            case "508":
+                writer.write(HTTP_STATUS_PREFIX + "LOOP_DETECTED");
+                break;
+            case "405":
+                writer.write(HTTP_STATUS_PREFIX + "METHOD_NOT_ALLOWED");
+                break;
+            case "301":
+                writer.write(HTTP_STATUS_PREFIX + "MOVED_PERMANENTLY");
+                break;
+            case "207":
+                writer.write(HTTP_STATUS_PREFIX + "MULTI_STATUS");
+                break;
+            case "300":
+                writer.write(HTTP_STATUS_PREFIX + "MULTIPLE_CHOICES");
+                break;
+            case "511":
+                writer.write(HTTP_STATUS_PREFIX + "NETWORK_AUTHENTICATION_REQUIRED");
+                break;
+            case "204":
+                writer.write(HTTP_STATUS_PREFIX + "NO_CONTENT");
+                break;
+            case "203":
+                writer.write(HTTP_STATUS_PREFIX + "NON_AUTHORITATIVE_INFORMATION");
+                break;
+            case "406":
+                writer.write(HTTP_STATUS_PREFIX + "NOT_ACCEPTABLE");
+                break;
+            case "510":
+                writer.write(HTTP_STATUS_PREFIX + "NOT_EXTENDED");
+                break;
+            case "404":
+                writer.write(HTTP_STATUS_PREFIX + "NOT_FOUND");
+                break;
+            case "501":
+                writer.write(HTTP_STATUS_PREFIX + "NOT_IMPLEMENTED");
+                break;
+            case "304":
+                writer.write(HTTP_STATUS_PREFIX + "NOT_MODIFIED");
+                break;
+            case "":
+            case "200":
+                writer.write(HTTP_STATUS_PREFIX + "OK");
+                break;
+            case "206":
+                writer.write(HTTP_STATUS_PREFIX + "PARTIAL_CONTENT");
+                break;
+            case "413":
+                writer.write(HTTP_STATUS_PREFIX + "PAYLOAD_TOO_LARGE");
+                break;
+            case "402":
+                writer.write(HTTP_STATUS_PREFIX + "PAYMENT_REQUIRED");
+                break;
+            case "308":
+                writer.write(HTTP_STATUS_PREFIX + "PERMANENT_REDIRECT");
+                break;
+            case "412":
+                writer.write(HTTP_STATUS_PREFIX + "PRECONDITION_FAILED");
+                break;
+            case "428":
+                writer.write(HTTP_STATUS_PREFIX + "PRECONDITION_REQUIRED");
+                break;
+            case "102":
+                writer.write(HTTP_STATUS_PREFIX + "PROCESSING");
+                break;
+            case "407":
+                writer.write(HTTP_STATUS_PREFIX + "PROXY_AUTHENTICATION_REQUIRED");
+                break;
+            case "431":
+                writer.write(HTTP_STATUS_PREFIX + "REQUEST_HEADER_FIELDS_TOO_LARGE");
+                break;
+            case "408":
+                writer.write(HTTP_STATUS_PREFIX + "REQUEST_TIMEOUT");
+                break;
+            case "416":
+                writer.write(HTTP_STATUS_PREFIX + "REQUESTED_RANGE_NOT_SATISFIABLE");
+                break;
+            case "205":
+                writer.write(HTTP_STATUS_PREFIX + "RESET_CONTENT");
+                break;
+            case "303":
+                writer.write(HTTP_STATUS_PREFIX + "SEE_OTHER");
+                break;
+            case "503":
+                writer.write(HTTP_STATUS_PREFIX + "SERVICE_UNAVAILABLE");
+                break;
+            case "101":
+                writer.write(HTTP_STATUS_PREFIX + "SWITCHING_PROTOCOLS");
+                break;
+            case "307":
+                writer.write(HTTP_STATUS_PREFIX + "TEMPORARY_REDIRECT");
+                break;
+            case "425":
+                writer.write(HTTP_STATUS_PREFIX + "TOO_EARLY");
+                break;
+            case "429":
+                writer.write(HTTP_STATUS_PREFIX + "TOO_MANY_REQUESTS");
+                break;
+            case "401":
+                writer.write(HTTP_STATUS_PREFIX + "UNAUTHORIZED");
+                break;
+            case "451":
+                writer.write(HTTP_STATUS_PREFIX + "UNAVAILABLE_FOR_LEGAL_REASONS");
+                break;
+            case "422":
+                writer.write(HTTP_STATUS_PREFIX + "UNPROCESSABLE_ENTITY");
+                break;
+            case "415":
+                writer.write(HTTP_STATUS_PREFIX + "UNSUPPORTED_MEDIA_TYPE");
+                break;
+            case "426":
+                writer.write(HTTP_STATUS_PREFIX + "UPGRADE_REQUIRED");
+                break;
+            case "414":
+                writer.write(HTTP_STATUS_PREFIX + "URI_TOO_LONG");
+                break;
+            case "506":
+                writer.write(HTTP_STATUS_PREFIX + "VARIANT_ALSO_NEGOTIATES");
+                break;
+            default:
+               throw new IllegalArgumentException("The given HTTP status code: " + httpCode
+                       + " is not supported by the 'org.springframework.http.HttpStatus' enum.");
+        }
+    }
+}

modules/openapi-generator/src/main/resources/JavaSpring/api.mustache

@@ -31,7 +31,12 @@ import io.virtualan.annotation.VirtualService;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 {{/jdk8-no-delegate}}
+{{^useResponseEntity}}
+import org.springframework.http.HttpStatus;
+{{/useResponseEntity}}
+{{#useResponseEntity}}
 import org.springframework.http.ResponseEntity;
+{{/useResponseEntity}}
 {{#useBeanValidation}}
 import org.springframework.validation.annotation.Validated;
 {{/useBeanValidation}}
@@ -222,7 +227,10 @@ public interface {{classname}} {
         headers = { {{#vendorExtensions.versionHeaderParamsList}}"{{baseName}}{{#defaultValue}}={{{.}}}{{/defaultValue}}"{{^-last}}, {{/-last}}{{/vendorExtensions.versionHeaderParamsList}} } {{/hasVersionHeaders}}{{#hasVersionQueryParams}},
         params = { {{#vendorExtensions.versionQueryParamsList}}"{{baseName}}{{#defaultValue}}={{{.}}}{{/defaultValue}}"{{^-last}}, {{/-last}}{{/vendorExtensions.versionQueryParamsList}} } {{/hasVersionQueryParams}}
     )
-    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{#delegate-method}}_{{/delegate-method}}{{operationId}}(
+    {{^useResponseEntity}}
+    @ResponseStatus({{#springHttpStatus}}{{#responses.0}}{{{code}}}{{/responses.0}}{{/springHttpStatus}})
+    {{/useResponseEntity}}
+    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}{{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}}{{#responseWrapper}}>{{/responseWrapper}} {{#delegate-method}}_{{/delegate-method}}{{operationId}}(
         {{#allParams}}{{>queryParams}}{{>pathParams}}{{>headerParams}}{{>bodyParams}}{{>formParams}}{{>cookieParams}}{{^-last}},
         {{/-last}}{{/allParams}}{{#reactive}}{{#hasParams}},
         {{/hasParams}}{{#swagger2AnnotationLibrary}}@Parameter(hidden = true){{/swagger2AnnotationLibrary}}{{#springFoxDocumentationProvider}}@ApiIgnore{{/springFoxDocumentationProvider}} final ServerWebExchange exchange{{/reactive}}{{#vendorExtensions.x-spring-paginated}}{{#hasParams}},
@@ -233,7 +241,7 @@ public interface {{classname}} {
     }
 
     // Override this method
-    {{#jdk8-default-interface}}default {{/jdk8-default-interface}} {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isArray}}Mono<{{{dataType}}}>{{/isArray}}{{#isArray}}Flux<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{/isFile}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}{{#reactive}}{{#hasParams}}, {{/hasParams}}{{#springFoxDocumentationProvider}}@ApiIgnore{{/springFoxDocumentationProvider}} final ServerWebExchange exchange{{/reactive}}{{#vendorExtensions.x-spring-paginated}}, {{#springFoxDocumentationProvider}}@ApiIgnore{{/springFoxDocumentationProvider}} final Pageable pageable{{/vendorExtensions.x-spring-paginated}}){{#unhandledException}} throws Exception{{/unhandledException}} {
+    {{#jdk8-default-interface}}default {{/jdk8-default-interface}} {{#responseWrapper}}{{.}}<{{/responseWrapper}}{{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}}{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isArray}}Mono<{{{dataType}}}>{{/isArray}}{{#isArray}}Flux<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{/isFile}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}{{#reactive}}{{#hasParams}}, {{/hasParams}}{{#springFoxDocumentationProvider}}@ApiIgnore{{/springFoxDocumentationProvider}} final ServerWebExchange exchange{{/reactive}}{{#vendorExtensions.x-spring-paginated}}, {{#springFoxDocumentationProvider}}@ApiIgnore{{/springFoxDocumentationProvider}} final Pageable pageable{{/vendorExtensions.x-spring-paginated}}){{#unhandledException}} throws Exception{{/unhandledException}} {
         {{/delegate-method}}
         {{^isDelegate}}
         {{>methodBody}}

modules/openapi-generator/src/main/resources/JavaSpring/apiController.mustache

@@ -21,7 +21,9 @@ import io.swagger.annotations.*;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
+{{#useResponseEntity}}
 import org.springframework.http.ResponseEntity;
+{{/useResponseEntity}}
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -109,7 +111,7 @@ public class {{classname}}Controller implements {{classname}} {
     {{#isDeprecated}}
     @Deprecated
     {{/isDeprecated}}
-    public {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}(
+    public {{#responseWrapper}}{{.}}<{{/responseWrapper}}{{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}}{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}(
         {{#allParams}}{{>queryParams}}{{>pathParams}}{{>headerParams}}{{>bodyParams}}{{>formParams}}{{>cookieParams}}{{^-last}},
         {{/-last}}{{/allParams}}{{#vendorExtensions.x-spring-paginated}}{{#hasParams}},
         {{/hasParams}}{{#springFoxDocumentationProvider}}@ApiIgnore {{/springFoxDocumentationProvider}}final Pageable pageable{{/vendorExtensions.x-spring-paginated}}
@@ -119,9 +121,9 @@ public class {{classname}}Controller implements {{classname}} {
         {{>methodBody}}
         {{/async}}
         {{#async}}
-        return new Callable<ResponseEntity<{{>returnTypes}}>>() {
+        return new Callable<{{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}}>() {
             @Override
-            public ResponseEntity<{{>returnTypes}}> call() {
+            public {{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}} call() {
                 {{>methodBody}}
             }
         };

modules/openapi-generator/src/main/resources/JavaSpring/apiDelegate.mustache

@@ -4,7 +4,9 @@ package {{package}};
 {{/imports}}
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
+{{#useResponseEntity}}
 import org.springframework.http.ResponseEntity;
+{{/useResponseEntity}}
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.multipart.MultipartFile;
 {{#reactive}}
@@ -60,7 +62,7 @@ public interface {{classname}}Delegate {
     {{#isDeprecated}}
     @Deprecated
     {{/isDeprecated}}
-    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isArray}}Mono<{{{dataType}}}>{{/isArray}}{{#isArray}}Flux<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#isArray}}List<{{/isArray}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isArray}}>{{/isArray}}{{/isFile}} {{paramName}}{{^-last}},
+    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}{{#useResponseEntity}}ResponseEntity<{{/useResponseEntity}}{{>returnTypes}}{{#useResponseEntity}}>{{/useResponseEntity}}{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isArray}}Mono<{{{dataType}}}>{{/isArray}}{{#isArray}}Flux<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#isArray}}List<{{/isArray}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isArray}}>{{/isArray}}{{/isFile}} {{paramName}}{{^-last}},
         {{/-last}}{{/allParams}}{{#reactive}}{{#hasParams}},
         {{/hasParams}}ServerWebExchange exchange{{/reactive}}{{#vendorExtensions.x-spring-paginated}}, final Pageable pageable{{/vendorExtensions.x-spring-paginated}}){{#unhandledException}} throws Exception{{/unhandledException}}{{^jdk8-default-interface}};{{/jdk8-default-interface}}{{#jdk8-default-interface}} {
         {{>methodBody}}

modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache

@@ -14,14 +14,20 @@ return CompletableFuture.supplyAsync(()-> {
     {{#-last}}
 {{#async}}        {{/async}}{{^async}}    {{/async}}        }
 {{#async}}    {{/async}}        });
-{{#async}}    {{/async}}        return new ResponseEntity<>({{#returnSuccessCode}}HttpStatus.valueOf({{{statusCode}}}){{/returnSuccessCode}}{{^returnSuccessCode}}HttpStatus.NOT_IMPLEMENTED{{/returnSuccessCode}});
+{{#async}}    {{/async}}        {{#useResponseEntity}}return new ResponseEntity<>({{#returnSuccessCode}}HttpStatus.valueOf({{{statusCode}}}){{/returnSuccessCode}}{{^returnSuccessCode}}HttpStatus.NOT_IMPLEMENTED{{/returnSuccessCode}});
+{{/useResponseEntity}}
+{{^useResponseEntity}}throw new IllegalArgumentException("Not implemented");
+{{/useResponseEntity}}
             {{#async}}
         }, Runnable::run);
             {{/async}}
     {{/-last}}
 {{/examples}}
 {{^examples}}
-return {{#async}}CompletableFuture.completedFuture({{/async}}new ResponseEntity<>({{#returnSuccessCode}}HttpStatus.OK{{/returnSuccessCode}}{{^returnSuccessCode}}HttpStatus.NOT_IMPLEMENTED{{/returnSuccessCode}}){{#async}}){{/async}};
+{{#useResponseEntity}}return {{#async}}CompletableFuture.completedFuture({{/async}}new ResponseEntity<>({{#returnSuccessCode}}HttpStatus.OK{{/returnSuccessCode}}{{^returnSuccessCode}}HttpStatus.NOT_IMPLEMENTED{{/returnSuccessCode}}){{#async}}){{/async}};
+{{/useResponseEntity}}
+{{^useResponseEntity}}throw new IllegalArgumentException("Not implemented");
+{{/useResponseEntity}}
 {{/examples}}
 {{/reactive}}
 {{#reactive}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java

@@ -17,16 +17,7 @@
 
 package org.openapitools.codegen.java.spring;
 
-import static java.util.stream.Collectors.groupingBy;
+import com.google.common.collect.ImmutableMap;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.openapitools.codegen.TestUtils.assertFileContains;
-import static org.openapitools.codegen.TestUtils.assertFileNotContains;
-import static org.openapitools.codegen.languages.SpringCodegen.*;
-import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.ANNOTATION_LIBRARY;
-import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.DOCUMENTATION_PROVIDER;
-import static org.testng.Assert.assertEquals;
-import static org.testng.Assert.fail;
-
 import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
@@ -34,28 +25,9 @@ import io.swagger.v3.oas.models.info.Info;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.servers.Server;
 import io.swagger.v3.parser.core.models.ParseOptions;
-
+import org.openapitools.codegen.*;
-import java.io.File;
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import java.util.*;
-import java.util.function.Consumer;
-import java.util.function.Function;
-import java.util.stream.Collectors;
-
 import org.openapitools.codegen.config.GlobalSettings;
 import org.openapitools.codegen.java.assertions.JavaFileAssert;
-import org.openapitools.codegen.CliOption;
-import org.openapitools.codegen.ClientOptInput;
-import org.openapitools.codegen.CodegenConstants;
-import org.openapitools.codegen.CodegenModel;
-import org.openapitools.codegen.CodegenOperation;
-import org.openapitools.codegen.CodegenParameter;
-import org.openapitools.codegen.CodegenProperty;
-import org.openapitools.codegen.DefaultGenerator;
-import org.openapitools.codegen.SupportingFile;
-import org.openapitools.codegen.TestUtils;
 import org.openapitools.codegen.languages.AbstractJavaCodegen;
 import org.openapitools.codegen.languages.SpringCodegen;
 import org.openapitools.codegen.languages.features.BeanValidationFeatures;
@@ -66,7 +38,26 @@ import org.testng.annotations.DataProvider;
 import org.testng.annotations.Ignore;
 import org.testng.annotations.Test;
 
-import com.google.common.collect.ImmutableMap;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static java.util.stream.Collectors.groupingBy;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.openapitools.codegen.TestUtils.assertFileContains;
+import static org.openapitools.codegen.TestUtils.assertFileNotContains;
+import static org.openapitools.codegen.languages.SpringCodegen.*;
+import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.ANNOTATION_LIBRARY;
+import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.DOCUMENTATION_PROVIDER;
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.fail;
 
 public class SpringCodegenTest {
 
@@ -552,6 +543,7 @@ public class SpringCodegenTest {
         Assert.assertEquals(codegen.additionalProperties().get(SpringCodegen.CONFIG_PACKAGE), "org.openapitools.configuration");
         Assert.assertEquals(codegen.additionalProperties().get(SpringCodegen.SERVER_PORT), "8082");
         Assert.assertEquals(codegen.additionalProperties().get(SpringCodegen.UNHANDLED_EXCEPTION_HANDLING), false);
+        Assert.assertEquals(codegen.additionalProperties().get(SpringCodegen.USE_RESPONSE_ENTITY), true);
     }
 
     @Test
@@ -1213,7 +1205,7 @@ public class SpringCodegenTest {
         codegen.setHateoas(true);
         generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
         generator.setGeneratorPropertyDefault(CodegenConstants.LEGACY_DISCRIMINATOR_BEHAVIOR, "false");
-        
+
 
         codegen.setUseOneOfInterfaces(true);
         codegen.setLegacyDiscriminatorBehavior(false);
@@ -1574,6 +1566,75 @@ public class SpringCodegenTest {
                 .assertMethod("getWithMapOfStrings").hasReturnType("ResponseEntity<Map<String, String>>");
     }
 
+    @Test
+    public void shouldGenerateMethodsWithoutUsingResponseEntityAndWithoutDelegation_issue11537() throws IOException {
+        Map<String, Object> additionalProperties = new HashMap<>();
+        additionalProperties.put(AbstractJavaCodegen.FULL_JAVA_UTIL, "true");
+        additionalProperties.put(SpringCodegen.USE_TAGS, "true");
+        additionalProperties.put(SpringCodegen.INTERFACE_ONLY, "true");
+        additionalProperties.put(SpringCodegen.SKIP_DEFAULT_INTERFACE, "true");
+        additionalProperties.put(SpringCodegen.PERFORM_BEANVALIDATION, "true");
+        additionalProperties.put(SpringCodegen.SPRING_CONTROLLER, "true");
+        additionalProperties.put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+        additionalProperties.put(USE_RESPONSE_ENTITY, "false");
+        Map<String, File> files = generateFromContract("src/test/resources/bugs/issue_11537.yaml", SPRING_BOOT, additionalProperties);
+
+        JavaFileAssert.assertThat(files.get("MetadataApi.java"))
+                .assertMethod("getSomething")
+                .hasReturnType("List<String>")
+                .assertMethodAnnotations()
+                .containsWithNameAndAttributes(
+                        "ResponseStatus",
+                        ImmutableMap.of("value", "HttpStatus.OK")
+                )
+                .toMethod()
+                .toFileAssert()
+                .assertMethod("putSomething")
+                .hasReturnType("String")
+                .assertMethodAnnotations()
+                .containsWithNameAndAttributes(
+                        "ResponseStatus",
+                        ImmutableMap.of("value", "HttpStatus.CREATED")
+                );
+    }
+
+    @Test
+    public void shouldGenerateMethodsWithoutUsingResponseEntityAndDelegation_issue11537() throws IOException {
+        Map<String, Object> additionalProperties = new HashMap<>();
+        additionalProperties.put(AbstractJavaCodegen.FULL_JAVA_UTIL, "true");
+        additionalProperties.put(SpringCodegen.USE_TAGS, "true");
+        additionalProperties.put(SpringCodegen.SKIP_DEFAULT_INTERFACE, "true");
+        additionalProperties.put(SpringCodegen.PERFORM_BEANVALIDATION, "true");
+        additionalProperties.put(SpringCodegen.SPRING_CONTROLLER, "true");
+        additionalProperties.put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+        additionalProperties.put(USE_RESPONSE_ENTITY, "false");
+        additionalProperties.put(DELEGATE_PATTERN, "true");
+        Map<String, File> files = generateFromContract("src/test/resources/bugs/issue_11537.yaml", SPRING_BOOT, additionalProperties);
+
+        JavaFileAssert.assertThat(files.get("MetadataApiDelegate.java"))
+                .assertMethod("getSomething").hasReturnType("List<String>")
+                .toFileAssert()
+                .assertMethod("putSomething").hasReturnType("String");
+
+        JavaFileAssert.assertThat(files.get("MetadataApi.java"))
+                .assertMethod("getSomething")
+                .hasReturnType("List<String>")
+                .assertMethodAnnotations()
+                .containsWithNameAndAttributes(
+                        "ResponseStatus",
+                        ImmutableMap.of("value", "HttpStatus.OK")
+                )
+                .toMethod()
+                .toFileAssert()
+                .assertMethod("putSomething")
+                .hasReturnType("String")
+                .assertMethodAnnotations()
+                .containsWithNameAndAttributes(
+                        "ResponseStatus",
+                        ImmutableMap.of("value", "HttpStatus.CREATED")
+                );
+    }
+
     @Test
     public void testResponseWithArray_issue12524() throws Exception {
         GlobalSettings.setProperty("skipFormModel", "true");
@@ -1970,7 +2031,7 @@ public class SpringCodegenTest {
                 .assertParameterAnnotations()
                 .containsWithNameAndAttributes("Min", ImmutableMap.of("value", "2"));
     }
-    
+
     @Test
     public void shouldHandleSeparatelyInterfaceAndModelAdditionalAnnotations() throws IOException {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();

modules/openapi-generator/src/test/java/org/openapitools/codegen/templating/mustache/SpringHttpStatusLambdaTest.java

@@ -0,0 +1,106 @@
+package org.openapitools.codegen.templating.mustache;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+import java.util.Locale;
+import java.util.Map;
+
+import static org.openapitools.codegen.templating.mustache.SpringHttpStatusLambda.HTTP_STATUS_PREFIX;
+import static org.testng.Assert.assertThrows;
+
+public class SpringHttpStatusLambdaTest extends LambdaTest {
+
+  @DataProvider(name = "springHttpStatusCodes")
+  public static Object[][] springHttpStatusCodes() {
+    return new Object[][] {
+      {"ACCEPTED", "202"},
+      {"ALREADY_REPORTED", "208"},
+      {"BAD_GATEWAY", "502"},
+      {"BAD_REQUEST", "400"},
+      {"BANDWIDTH_LIMIT_EXCEEDED", "509"},
+      {"CONFLICT", "409"},
+      {"CONTINUE", "100"},
+      {"CREATED", "201"},
+      {"EARLY_HINTS", "103"},
+      {"EXPECTATION_FAILED", "417"},
+      {"FAILED_DEPENDENCY", "424"},
+      {"FORBIDDEN", "403"},
+      {"FOUND", "302"},
+      {"GATEWAY_TIMEOUT", "504"},
+      {"GONE", "410"},
+      {"HTTP_VERSION_NOT_SUPPORTED", "505"},
+      {"I_AM_A_TEAPOT", "418"},
+      {"IM_USED", "226"},
+      {"INSUFFICIENT_STORAGE", "507"},
+      {"INTERNAL_SERVER_ERROR", "500"},
+      {"LENGTH_REQUIRED", "411"},
+      {"LOCKED", "423"},
+      {"LOOP_DETECTED", "508"},
+      {"METHOD_NOT_ALLOWED", "405"},
+      {"MOVED_PERMANENTLY", "301"},
+      {"MULTI_STATUS", "207"},
+      {"MULTIPLE_CHOICES", "300"},
+      {"NETWORK_AUTHENTICATION_REQUIRED", "511"},
+      {"NO_CONTENT", "204"},
+      {"NON_AUTHORITATIVE_INFORMATION", "203"},
+      {"NOT_ACCEPTABLE", "406"},
+      {"NOT_EXTENDED", "510"},
+      {"NOT_FOUND", "404"},
+      {"NOT_IMPLEMENTED", "501"},
+      {"NOT_MODIFIED", "304"},
+      {"OK", "200"},
+      {"PARTIAL_CONTENT", "206"},
+      {"PAYLOAD_TOO_LARGE", "413"},
+      {"PAYMENT_REQUIRED", "402"},
+      {"PERMANENT_REDIRECT", "308"},
+      {"PRECONDITION_FAILED", "412"},
+      {"PRECONDITION_REQUIRED", "428"},
+      {"PROCESSING", "102"},
+      {"PROXY_AUTHENTICATION_REQUIRED", "407"},
+      {"REQUEST_HEADER_FIELDS_TOO_LARGE", "431"},
+      {"REQUEST_TIMEOUT", "408"},
+      {"REQUESTED_RANGE_NOT_SATISFIABLE", "416"},
+      {"RESET_CONTENT", "205"},
+      {"SEE_OTHER", "303"},
+      {"SERVICE_UNAVAILABLE", "503"},
+      {"SWITCHING_PROTOCOLS", "101"},
+      {"TEMPORARY_REDIRECT", "307"},
+      {"TOO_EARLY", "425"},
+      {"TOO_MANY_REQUESTS", "429"},
+      {"UNAUTHORIZED", "401"},
+      {"UNAVAILABLE_FOR_LEGAL_REASONS", "451"},
+      {"UNPROCESSABLE_ENTITY", "422"},
+      {"UNSUPPORTED_MEDIA_TYPE", "415"},
+      {"UPGRADE_REQUIRED", "426"},
+      {"URI_TOO_LONG", "414"},
+      {"VARIANT_ALSO_NEGOTIATES", "506"}
+    };
+  }
+
+  @Test(dataProvider = "springHttpStatusCodes")
+  public void executeShouldConvertValues(String expectedHttpStatus, String httpCode) {
+    Map<String, Object> ctx = context("springHttpStatus", new SpringHttpStatusLambda());
+
+    test(
+        HTTP_STATUS_PREFIX + expectedHttpStatus,
+        String.format(Locale.ROOT, "{{#springHttpStatus}}%s{{/springHttpStatus}}", httpCode),
+        ctx);
+  }
+
+  @Test
+  public void executeShouldConvertEmptyHttpStatusTo200Ok() {
+    Map<String, Object> ctx = context("springHttpStatus", new SpringHttpStatusLambda());
+
+    test(HTTP_STATUS_PREFIX + "OK", "{{#springHttpStatus}}{{/springHttpStatus}}", ctx);
+  }
+
+  @Test
+  public void executeShouldConvertToHttpStatusNotImplementedAnyOtherStatus() {
+    Map<String, Object> ctx = context("springHttpStatus", new SpringHttpStatusLambda());
+
+    assertThrows(
+        IllegalArgumentException.class,
+        () -> execute("{{#springHttpStatus}}305{{/springHttpStatus}}", ctx));
+  }
+}

modules/openapi-generator/src/test/resources/bugs/issue_11537.yaml

@@ -0,0 +1,44 @@
+openapi: 3.0.1
+info:
+  title: metadata-svc
+  description: Metadata Service
+  contact:
+    name: Test Svc
+    email: xyz@xyz.com
+  version: 3.1.2
+servers:
+- url: https://localhost:8080/
+tags:
+- name: metadata
+  description: APIs to get metadata.
+paths:
+  /v1/a-path:
+    get:
+      tags:
+      - metadata
+      summary: A generic getter operation.
+      description: Get something from somewhere.
+      operationId: getSomething
+      responses:
+        200:
+          description: List of groups.
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  type: string
+  /v1/another-path:
+    post:
+      tags:
+      - metadata
+      summary: Insert something.
+      description: Insert something somewhere.
+      operationId: putSomething
+      responses:
+        201:
+          description: List of groups.
+          content:
+            application/json:
+              schema:
+                type: string

samples/client/petstore/spring-stubs/src/main/java/org/openapitools/api/PetApi.java

@@ -99,6 +99,7 @@ public interface PetApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -152,6 +153,7 @@ public interface PetApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -207,6 +209,7 @@ public interface PetApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -258,6 +261,7 @@ public interface PetApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -296,6 +300,7 @@ public interface PetApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -334,6 +339,7 @@ public interface PetApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -383,6 +389,7 @@ public interface PetApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 }

samples/client/petstore/spring-stubs/src/main/java/org/openapitools/api/StoreApi.java

@@ -60,6 +60,7 @@ public interface StoreApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -93,6 +94,7 @@ public interface StoreApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -141,6 +143,7 @@ public interface StoreApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -186,6 +189,7 @@ public interface StoreApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 }

samples/client/petstore/spring-stubs/src/main/java/org/openapitools/api/UserApi.java

@@ -59,6 +59,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -86,6 +87,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -113,6 +115,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -143,6 +146,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -190,6 +194,7 @@ public interface UserApi {
         });
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -223,6 +228,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -249,6 +255,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 
@@ -281,6 +288,7 @@ public interface UserApi {
     ) {
         return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
 
+
     }
 
 }

samples/server/petstore/springboot-delegate-no-response-entity/.openapi-generator-ignore

@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/server/petstore/springboot-delegate-no-response-entity/.openapi-generator/FILES

@@ -0,0 +1,26 @@
+README.md
+pom.xml
+src/main/java/org/openapitools/OpenApiGeneratorApplication.java
+src/main/java/org/openapitools/RFC3339DateFormat.java
+src/main/java/org/openapitools/api/ApiUtil.java
+src/main/java/org/openapitools/api/PetApi.java
+src/main/java/org/openapitools/api/PetApiController.java
+src/main/java/org/openapitools/api/PetApiDelegate.java
+src/main/java/org/openapitools/api/StoreApi.java
+src/main/java/org/openapitools/api/StoreApiController.java
+src/main/java/org/openapitools/api/StoreApiDelegate.java
+src/main/java/org/openapitools/api/UserApi.java
+src/main/java/org/openapitools/api/UserApiController.java
+src/main/java/org/openapitools/api/UserApiDelegate.java
+src/main/java/org/openapitools/configuration/HomeController.java
+src/main/java/org/openapitools/configuration/SpringFoxConfiguration.java
+src/main/java/org/openapitools/model/Category.java
+src/main/java/org/openapitools/model/ModelApiResponse.java
+src/main/java/org/openapitools/model/Order.java
+src/main/java/org/openapitools/model/Pet.java
+src/main/java/org/openapitools/model/Tag.java
+src/main/java/org/openapitools/model/User.java
+src/main/resources/application.properties
+src/main/resources/openapi.yaml
+src/main/resources/static/swagger-ui.html
+src/test/java/org/openapitools/OpenApiGeneratorApplicationTests.java

samples/server/petstore/springboot-delegate-no-response-entity/.openapi-generator/VERSION

@@ -0,0 +1 @@
+6.5.0-SNAPSHOT

samples/server/petstore/springboot-delegate-no-response-entity/README.md

@@ -0,0 +1,27 @@
+# OpenAPI generated server
+
+Spring Boot Server
+
+## Overview
+This server was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.
+By using the [OpenAPI-Spec](https://openapis.org), you can easily generate a server stub.
+This is an example of building a OpenAPI-enabled server in Java using the SpringBoot framework.
+
+The underlying library integrating OpenAPI to Spring Boot is [springfox](https://github.com/springfox/springfox).
+Springfox will generate an OpenAPI v2 (fka Swagger RESTful API Documentation Specification) specification based on the
+generated Controller and Model classes. The specification is available to download using the following url:
+http://localhost:8080/v2/api-docs/
+
+**HEADS-UP**: Springfox is deprecated for removal in version 6.0.0 of openapi-generator. The project seems to be no longer
+maintained (last commit is of Oct 14, 2020). It works with Spring Boot 2.5.x but not with 2.6. Spring Boot 2.5 is
+supported until 2022-05-19. Users of openapi-generator should migrate to the springdoc documentation provider which is,
+as an added bonus, OpenAPI v3 compatible.
+
+
+
+Start your server as a simple java application
+
+You can view the api documentation in swagger-ui by pointing to
+http://localhost:8080/swagger-ui.html
+
+Change default port value in application.properties

samples/server/petstore/springboot-delegate-no-response-entity/pom.xml

@@ -0,0 +1,89 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.openapitools</groupId>
+    <artifactId>springboot-delegate-no-response-entity</artifactId>
+    <packaging>jar</packaging>
+    <name>springboot-delegate-no-response-entity</name>
+    <version>1.0.0</version>
+    <properties>
+        <java.version>1.8</java.version>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <springfox.version>2.9.2</springfox.version>
+        <swagger-ui.version>4.15.5</swagger-ui.version>
+    </properties>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.5.14</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <build>
+        <sourceDirectory>src/main/java</sourceDirectory>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.data</groupId>
+            <artifactId>spring-data-commons</artifactId>
+        </dependency>
+        <!--SpringFox dependencies -->
+        <dependency>
+            <groupId>io.springfox</groupId>
+            <artifactId>springfox-swagger2</artifactId>
+            <version>${springfox.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.webjars</groupId>
+            <artifactId>swagger-ui</artifactId>
+            <version>${swagger-ui.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.webjars</groupId>
+            <artifactId>webjars-locator-core</artifactId>
+        </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-yaml</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.2.6</version>
+        </dependency>
+        <!-- Bean Validation API support -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/OpenApiGeneratorApplication.java

@@ -0,0 +1,30 @@
+package org.openapitools;
+
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.FilterType;
+import org.springframework.context.annotation.FullyQualifiedAnnotationBeanNameGenerator;
+
+@SpringBootApplication(
+    nameGenerator = FullyQualifiedAnnotationBeanNameGenerator.class
+)
+@ComponentScan(
+    basePackages = {"org.openapitools", "org.openapitools.api" , "org.openapitools.configuration"},
+    nameGenerator = FullyQualifiedAnnotationBeanNameGenerator.class
+)
+public class OpenApiGeneratorApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(OpenApiGeneratorApplication.class, args);
+    }
+
+    @Bean(name = "org.openapitools.OpenApiGeneratorApplication.jsonNullableModule")
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/RFC3339DateFormat.java

@@ -0,0 +1,38 @@
+package org.openapitools;
+
+import com.fasterxml.jackson.databind.util.StdDateFormat;
+
+import java.text.DateFormat;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.TimeZone;
+
+public class RFC3339DateFormat extends DateFormat {
+  private static final long serialVersionUID = 1L;
+  private static final TimeZone TIMEZONE_Z = TimeZone.getTimeZone("UTC");
+
+  private final StdDateFormat fmt = new StdDateFormat()
+          .withTimeZone(TIMEZONE_Z)
+          .withColonInTimeZone(true);
+
+  public RFC3339DateFormat() {
+    this.calendar = new GregorianCalendar();
+  }
+
+  @Override
+  public Date parse(String source, ParsePosition pos) {
+    return fmt.parse(source, pos);
+  }
+
+  @Override
+  public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
+    return fmt.format(date, toAppendTo, fieldPosition);
+  }
+
+  @Override
+  public Object clone() {
+    return this;
+  }
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/ApiUtil.java

@@ -0,0 +1,19 @@
+package org.openapitools.api;
+
+import org.springframework.web.context.request.NativeWebRequest;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+public class ApiUtil {
+    public static void setExampleResponse(NativeWebRequest req, String contentType, String example) {
+        try {
+            HttpServletResponse res = req.getNativeResponse(HttpServletResponse.class);
+            res.setCharacterEncoding("UTF-8");
+            res.addHeader("Content-Type", contentType);
+            res.getWriter().print(example);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/PetApi.java

@@ -0,0 +1,345 @@
+/**
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech) (6.5.0-SNAPSHOT).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+package org.openapitools.api;
+
+import org.openapitools.model.ModelApiResponse;
+import org.openapitools.model.Pet;
+import io.swagger.annotations.*;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Validated
+@Api(value = "pet", description = "Everything about your Pets")
+public interface PetApi {
+
+    default PetApiDelegate getDelegate() {
+        return new PetApiDelegate() {};
+    }
+
+    /**
+     * POST /pet : Add a new pet to the store
+     * 
+     *
+     * @param pet Pet object that needs to be added to the store (required)
+     * @return successful operation (status code 200)
+     *         or Invalid input (status code 405)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Add a new pet to the store",
+        nickname = "addPet",
+        notes = "",
+        response = Pet.class,
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Pet.class),
+        @ApiResponse(code = 405, message = "Invalid input")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/pet",
+        produces = { "application/xml", "application/json" },
+        consumes = { "application/json", "application/xml" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Pet addPet(
+        @ApiParam(value = "Pet object that needs to be added to the store", required = true) @Valid @RequestBody Pet pet
+    ) {
+        return getDelegate().addPet(pet);
+    }
+
+
+    /**
+     * DELETE /pet/{petId} : Deletes a pet
+     * 
+     *
+     * @param petId Pet id to delete (required)
+     * @param apiKey  (optional)
+     * @return Invalid pet value (status code 400)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Deletes a pet",
+        nickname = "deletePet",
+        notes = "",
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 400, message = "Invalid pet value")
+    })
+    @RequestMapping(
+        method = RequestMethod.DELETE,
+        value = "/pet/{petId}"
+    )
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    default Void deletePet(
+        @ApiParam(value = "Pet id to delete", required = true) @PathVariable("petId") Long petId,
+        @ApiParam(value = "") @RequestHeader(value = "api_key", required = false) String apiKey
+    ) {
+        return getDelegate().deletePet(petId, apiKey);
+    }
+
+
+    /**
+     * GET /pet/findByStatus : Finds Pets by status
+     * Multiple status values can be provided with comma separated strings
+     *
+     * @param status Status values that need to be considered for filter (required)
+     * @return successful operation (status code 200)
+     *         or Invalid status value (status code 400)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Finds Pets by status",
+        nickname = "findPetsByStatus",
+        notes = "Multiple status values can be provided with comma separated strings",
+        response = Pet.class,
+        responseContainer = "List",
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Pet.class, responseContainer = "List"),
+        @ApiResponse(code = 400, message = "Invalid status value")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/pet/findByStatus",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default List<Pet> findPetsByStatus(
+        @NotNull @ApiParam(value = "Status values that need to be considered for filter", required = true, allowableValues = "available, pending, sold") @Valid @RequestParam(value = "status", required = true) List<String> status
+    ) {
+        return getDelegate().findPetsByStatus(status);
+    }
+
+
+    /**
+     * GET /pet/findByTags : Finds Pets by tags
+     * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+     *
+     * @param tags Tags to filter by (required)
+     * @return successful operation (status code 200)
+     *         or Invalid tag value (status code 400)
+     * @deprecated
+     */
+    @Deprecated
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Finds Pets by tags",
+        nickname = "findPetsByTags",
+        notes = "Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.",
+        response = Pet.class,
+        responseContainer = "List",
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Pet.class, responseContainer = "List"),
+        @ApiResponse(code = 400, message = "Invalid tag value")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/pet/findByTags",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default List<Pet> findPetsByTags(
+        @NotNull @ApiParam(value = "Tags to filter by", required = true) @Valid @RequestParam(value = "tags", required = true) List<String> tags
+    ) {
+        return getDelegate().findPetsByTags(tags);
+    }
+
+
+    /**
+     * GET /pet/{petId} : Find pet by ID
+     * Returns a single pet
+     *
+     * @param petId ID of pet to return (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Pet not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Find pet by ID",
+        nickname = "getPetById",
+        notes = "Returns a single pet",
+        response = Pet.class,
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Pet.class),
+        @ApiResponse(code = 400, message = "Invalid ID supplied"),
+        @ApiResponse(code = 404, message = "Pet not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/pet/{petId}",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Pet getPetById(
+        @ApiParam(value = "ID of pet to return", required = true) @PathVariable("petId") Long petId
+    ) {
+        return getDelegate().getPetById(petId);
+    }
+
+
+    /**
+     * PUT /pet : Update an existing pet
+     * 
+     *
+     * @param pet Pet object that needs to be added to the store (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Pet not found (status code 404)
+     *         or Validation exception (status code 405)
+     * API documentation for the updatePet operation
+     * @see <a href="http://petstore.swagger.io/v2/doc/updatePet">Update an existing pet Documentation</a>
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Update an existing pet",
+        nickname = "updatePet",
+        notes = "",
+        response = Pet.class,
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Pet.class),
+        @ApiResponse(code = 400, message = "Invalid ID supplied"),
+        @ApiResponse(code = 404, message = "Pet not found"),
+        @ApiResponse(code = 405, message = "Validation exception")
+    })
+    @RequestMapping(
+        method = RequestMethod.PUT,
+        value = "/pet",
+        produces = { "application/xml", "application/json" },
+        consumes = { "application/json", "application/xml" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Pet updatePet(
+        @ApiParam(value = "Pet object that needs to be added to the store", required = true) @Valid @RequestBody Pet pet
+    ) {
+        return getDelegate().updatePet(pet);
+    }
+
+
+    /**
+     * POST /pet/{petId} : Updates a pet in the store with form data
+     * 
+     *
+     * @param petId ID of pet that needs to be updated (required)
+     * @param name Updated name of the pet (optional)
+     * @param status Updated status of the pet (optional)
+     * @return Invalid input (status code 405)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "Updates a pet in the store with form data",
+        nickname = "updatePetWithForm",
+        notes = "",
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 405, message = "Invalid input")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/pet/{petId}",
+        consumes = { "application/x-www-form-urlencoded" }
+    )
+    @ResponseStatus(HttpStatus.METHOD_NOT_ALLOWED)
+    default Void updatePetWithForm(
+        @ApiParam(value = "ID of pet that needs to be updated", required = true) @PathVariable("petId") Long petId,
+        @ApiParam(value = "Updated name of the pet") @Valid @RequestParam(value = "name", required = false) String name,
+        @ApiParam(value = "Updated status of the pet") @Valid @RequestParam(value = "status", required = false) String status
+    ) {
+        return getDelegate().updatePetWithForm(petId, name, status);
+    }
+
+
+    /**
+     * POST /pet/{petId}/uploadImage : uploads an image
+     * 
+     *
+     * @param petId ID of pet to update (required)
+     * @param additionalMetadata Additional data to pass to server (optional)
+     * @param file file to upload (optional)
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "pet" },
+        value = "uploads an image",
+        nickname = "uploadFile",
+        notes = "",
+        response = ModelApiResponse.class,
+        authorizations = {
+            @Authorization(value = "petstore_auth", scopes = {
+                @AuthorizationScope(scope = "write:pets", description = "modify pets in your account"),
+                @AuthorizationScope(scope = "read:pets", description = "read your pets")
+            })
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = ModelApiResponse.class)
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/pet/{petId}/uploadImage",
+        produces = { "application/json" },
+        consumes = { "multipart/form-data" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default ModelApiResponse uploadFile(
+        @ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") Long petId,
+        @ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) String additionalMetadata,
+        @ApiParam(value = "file to upload") @RequestPart(value = "file", required = false) MultipartFile file
+    ) {
+        return getDelegate().uploadFile(petId, additionalMetadata, file);
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/PetApiController.java

@@ -0,0 +1,44 @@
+package org.openapitools.api;
+
+import org.openapitools.model.ModelApiResponse;
+import org.openapitools.model.Pet;
+
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.CookieValue;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.constraints.*;
+import javax.validation.Valid;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Controller
+@RequestMapping("${openapi.openAPIPetstore.base-path:/v2}")
+public class PetApiController implements PetApi {
+
+    private final PetApiDelegate delegate;
+
+    public PetApiController(@Autowired(required = false) PetApiDelegate delegate) {
+        this.delegate = Optional.ofNullable(delegate).orElse(new PetApiDelegate() {});
+    }
+
+    @Override
+    public PetApiDelegate getDelegate() {
+        return delegate;
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/PetApiDelegate.java

@@ -0,0 +1,231 @@
+package org.openapitools.api;
+
+import org.openapitools.model.ModelApiResponse;
+import org.openapitools.model.Pet;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+/**
+ * A delegate to be called by the {@link PetApiController}}.
+ * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
+ */
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public interface PetApiDelegate {
+
+    default Optional<NativeWebRequest> getRequest() {
+        return Optional.empty();
+    }
+
+    /**
+     * POST /pet : Add a new pet to the store
+     * 
+     *
+     * @param pet Pet object that needs to be added to the store (required)
+     * @return successful operation (status code 200)
+     *         or Invalid input (status code 405)
+     * @see PetApi#addPet
+     */
+    default Pet addPet(Pet pet) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Pet> <id>123456789</id> <Category> <id>123456789</id> <name>aeiou</name> </Category> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> <Tag> <id>123456789</id> <name>aeiou</name> </Tag> </tags> <status>aeiou</status> </Pet>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * DELETE /pet/{petId} : Deletes a pet
+     * 
+     *
+     * @param petId Pet id to delete (required)
+     * @param apiKey  (optional)
+     * @return Invalid pet value (status code 400)
+     * @see PetApi#deletePet
+     */
+    default Void deletePet(Long petId,
+        String apiKey) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /pet/findByStatus : Finds Pets by status
+     * Multiple status values can be provided with comma separated strings
+     *
+     * @param status Status values that need to be considered for filter (required)
+     * @return successful operation (status code 200)
+     *         or Invalid status value (status code 400)
+     * @see PetApi#findPetsByStatus
+     */
+    default List<Pet> findPetsByStatus(List<String> status) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "[ { \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }, { \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" } ]";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Pet> <id>123456789</id> <Category> <id>123456789</id> <name>aeiou</name> </Category> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> <Tag> <id>123456789</id> <name>aeiou</name> </Tag> </tags> <status>aeiou</status> </Pet>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /pet/findByTags : Finds Pets by tags
+     * Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+     *
+     * @param tags Tags to filter by (required)
+     * @return successful operation (status code 200)
+     *         or Invalid tag value (status code 400)
+     * @deprecated
+     * @see PetApi#findPetsByTags
+     */
+    @Deprecated
+    default List<Pet> findPetsByTags(List<String> tags) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "[ { \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }, { \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" } ]";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Pet> <id>123456789</id> <Category> <id>123456789</id> <name>aeiou</name> </Category> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> <Tag> <id>123456789</id> <name>aeiou</name> </Tag> </tags> <status>aeiou</status> </Pet>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /pet/{petId} : Find pet by ID
+     * Returns a single pet
+     *
+     * @param petId ID of pet to return (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Pet not found (status code 404)
+     * @see PetApi#getPetById
+     */
+    default Pet getPetById(Long petId) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Pet> <id>123456789</id> <Category> <id>123456789</id> <name>aeiou</name> </Category> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> <Tag> <id>123456789</id> <name>aeiou</name> </Tag> </tags> <status>aeiou</status> </Pet>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * PUT /pet : Update an existing pet
+     * 
+     *
+     * @param pet Pet object that needs to be added to the store (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Pet not found (status code 404)
+     *         or Validation exception (status code 405)
+     * API documentation for the updatePet operation
+     * @see <a href="http://petstore.swagger.io/v2/doc/updatePet">Update an existing pet Documentation</a>
+     * @see PetApi#updatePet
+     */
+    default Pet updatePet(Pet pet) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Pet> <id>123456789</id> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> </tags> <status>aeiou</status> </Pet>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * POST /pet/{petId} : Updates a pet in the store with form data
+     * 
+     *
+     * @param petId ID of pet that needs to be updated (required)
+     * @param name Updated name of the pet (optional)
+     * @param status Updated status of the pet (optional)
+     * @return Invalid input (status code 405)
+     * @see PetApi#updatePetWithForm
+     */
+    default Void updatePetWithForm(Long petId,
+        String name,
+        String status) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * POST /pet/{petId}/uploadImage : uploads an image
+     * 
+     *
+     * @param petId ID of pet to update (required)
+     * @param additionalMetadata Additional data to pass to server (optional)
+     * @param file file to upload (optional)
+     * @return successful operation (status code 200)
+     * @see PetApi#uploadFile
+     */
+    default ModelApiResponse uploadFile(Long petId,
+        String additionalMetadata,
+        MultipartFile file) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"code\" : 0, \"type\" : \"type\", \"message\" : \"message\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/StoreApi.java

@@ -0,0 +1,160 @@
+/**
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech) (6.5.0-SNAPSHOT).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+package org.openapitools.api;
+
+import java.util.Map;
+import org.openapitools.model.Order;
+import io.swagger.annotations.*;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Validated
+@Api(value = "store", description = "Access to Petstore orders")
+public interface StoreApi {
+
+    default StoreApiDelegate getDelegate() {
+        return new StoreApiDelegate() {};
+    }
+
+    /**
+     * DELETE /store/order/{orderId} : Delete purchase order by ID
+     * For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors
+     *
+     * @param orderId ID of the order that needs to be deleted (required)
+     * @return Invalid ID supplied (status code 400)
+     *         or Order not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "store" },
+        value = "Delete purchase order by ID",
+        nickname = "deleteOrder",
+        notes = "For valid response try integer IDs with value < 1000. Anything above 1000 or nonintegers will generate API errors"
+    )
+    @ApiResponses({
+        @ApiResponse(code = 400, message = "Invalid ID supplied"),
+        @ApiResponse(code = 404, message = "Order not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.DELETE,
+        value = "/store/order/{orderId}"
+    )
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    default Void deleteOrder(
+        @ApiParam(value = "ID of the order that needs to be deleted", required = true) @PathVariable("orderId") String orderId
+    ) {
+        return getDelegate().deleteOrder(orderId);
+    }
+
+
+    /**
+     * GET /store/inventory : Returns pet inventories by status
+     * Returns a map of status codes to quantities
+     *
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "store" },
+        value = "Returns pet inventories by status",
+        nickname = "getInventory",
+        notes = "Returns a map of status codes to quantities",
+        response = Integer.class,
+        responseContainer = "Map",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Map.class, responseContainer = "Map")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/store/inventory",
+        produces = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Map<String, Integer> getInventory(
+        
+    ) {
+        return getDelegate().getInventory();
+    }
+
+
+    /**
+     * GET /store/order/{orderId} : Find purchase order by ID
+     * For valid response try integer IDs with value &lt;&#x3D; 5 or &gt; 10. Other values will generate exceptions
+     *
+     * @param orderId ID of pet that needs to be fetched (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Order not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "store" },
+        value = "Find purchase order by ID",
+        nickname = "getOrderById",
+        notes = "For valid response try integer IDs with value <= 5 or > 10. Other values will generate exceptions",
+        response = Order.class
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Order.class),
+        @ApiResponse(code = 400, message = "Invalid ID supplied"),
+        @ApiResponse(code = 404, message = "Order not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/store/order/{orderId}",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Order getOrderById(
+        @Min(1L) @Max(5L) @ApiParam(value = "ID of pet that needs to be fetched", required = true) @PathVariable("orderId") Long orderId
+    ) {
+        return getDelegate().getOrderById(orderId);
+    }
+
+
+    /**
+     * POST /store/order : Place an order for a pet
+     * 
+     *
+     * @param order order placed for purchasing the pet (required)
+     * @return successful operation (status code 200)
+     *         or Invalid Order (status code 400)
+     */
+    @ApiOperation(
+        tags = { "store" },
+        value = "Place an order for a pet",
+        nickname = "placeOrder",
+        notes = "",
+        response = Order.class
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = Order.class),
+        @ApiResponse(code = 400, message = "Invalid Order")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/store/order",
+        produces = { "application/xml", "application/json" },
+        consumes = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Order placeOrder(
+        @ApiParam(value = "order placed for purchasing the pet", required = true) @Valid @RequestBody Order order
+    ) {
+        return getDelegate().placeOrder(order);
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/StoreApiController.java

@@ -0,0 +1,44 @@
+package org.openapitools.api;
+
+import java.util.Map;
+import org.openapitools.model.Order;
+
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.CookieValue;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.constraints.*;
+import javax.validation.Valid;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Controller
+@RequestMapping("${openapi.openAPIPetstore.base-path:/v2}")
+public class StoreApiController implements StoreApi {
+
+    private final StoreApiDelegate delegate;
+
+    public StoreApiController(@Autowired(required = false) StoreApiDelegate delegate) {
+        this.delegate = Optional.ofNullable(delegate).orElse(new StoreApiDelegate() {});
+    }
+
+    @Override
+    public StoreApiDelegate getDelegate() {
+        return delegate;
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/StoreApiDelegate.java

@@ -0,0 +1,109 @@
+package org.openapitools.api;
+
+import java.util.Map;
+import org.openapitools.model.Order;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+/**
+ * A delegate to be called by the {@link StoreApiController}}.
+ * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
+ */
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public interface StoreApiDelegate {
+
+    default Optional<NativeWebRequest> getRequest() {
+        return Optional.empty();
+    }
+
+    /**
+     * DELETE /store/order/{orderId} : Delete purchase order by ID
+     * For valid response try integer IDs with value &lt; 1000. Anything above 1000 or nonintegers will generate API errors
+     *
+     * @param orderId ID of the order that needs to be deleted (required)
+     * @return Invalid ID supplied (status code 400)
+     *         or Order not found (status code 404)
+     * @see StoreApi#deleteOrder
+     */
+    default Void deleteOrder(String orderId) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /store/inventory : Returns pet inventories by status
+     * Returns a map of status codes to quantities
+     *
+     * @return successful operation (status code 200)
+     * @see StoreApi#getInventory
+     */
+    default Map<String, Integer> getInventory() {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /store/order/{orderId} : Find purchase order by ID
+     * For valid response try integer IDs with value &lt;&#x3D; 5 or &gt; 10. Other values will generate exceptions
+     *
+     * @param orderId ID of pet that needs to be fetched (required)
+     * @return successful operation (status code 200)
+     *         or Invalid ID supplied (status code 400)
+     *         or Order not found (status code 404)
+     * @see StoreApi#getOrderById
+     */
+    default Order getOrderById(Long orderId) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"petId\" : 6, \"quantity\" : 1, \"id\" : 0, \"shipDate\" : \"2000-01-23T04:56:07.000+00:00\", \"complete\" : false, \"status\" : \"placed\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Order> <id>123456789</id> <petId>123456789</petId> <quantity>123</quantity> <shipDate>2000-01-23T04:56:07.000Z</shipDate> <status>aeiou</status> <complete>true</complete> </Order>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * POST /store/order : Place an order for a pet
+     * 
+     *
+     * @param order order placed for purchasing the pet (required)
+     * @return successful operation (status code 200)
+     *         or Invalid Order (status code 400)
+     * @see StoreApi#placeOrder
+     */
+    default Order placeOrder(Order order) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"petId\" : 6, \"quantity\" : 1, \"id\" : 0, \"shipDate\" : \"2000-01-23T04:56:07.000+00:00\", \"complete\" : false, \"status\" : \"placed\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<Order> <id>123456789</id> <petId>123456789</petId> <quantity>123</quantity> <shipDate>2000-01-23T04:56:07.000Z</shipDate> <status>aeiou</status> <complete>true</complete> </Order>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/UserApi.java

@@ -0,0 +1,294 @@
+/**
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech) (6.5.0-SNAPSHOT).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+package org.openapitools.api;
+
+import java.util.List;
+import java.time.OffsetDateTime;
+import org.openapitools.model.User;
+import io.swagger.annotations.*;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Validated
+@Api(value = "user", description = "Operations about user")
+public interface UserApi {
+
+    default UserApiDelegate getDelegate() {
+        return new UserApiDelegate() {};
+    }
+
+    /**
+     * POST /user : Create user
+     * This can only be done by the logged in user.
+     *
+     * @param user Created user object (required)
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Create user",
+        nickname = "createUser",
+        notes = "This can only be done by the logged in user.",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/user",
+        consumes = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Void createUser(
+        @ApiParam(value = "Created user object", required = true) @Valid @RequestBody User user
+    ) {
+        return getDelegate().createUser(user);
+    }
+
+
+    /**
+     * POST /user/createWithArray : Creates list of users with given input array
+     * 
+     *
+     * @param user List of user object (required)
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Creates list of users with given input array",
+        nickname = "createUsersWithArrayInput",
+        notes = "",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/user/createWithArray",
+        consumes = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Void createUsersWithArrayInput(
+        @ApiParam(value = "List of user object", required = true) @Valid @RequestBody List<User> user
+    ) {
+        return getDelegate().createUsersWithArrayInput(user);
+    }
+
+
+    /**
+     * POST /user/createWithList : Creates list of users with given input array
+     * 
+     *
+     * @param user List of user object (required)
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Creates list of users with given input array",
+        nickname = "createUsersWithListInput",
+        notes = "",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation")
+    })
+    @RequestMapping(
+        method = RequestMethod.POST,
+        value = "/user/createWithList",
+        consumes = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Void createUsersWithListInput(
+        @ApiParam(value = "List of user object", required = true) @Valid @RequestBody List<User> user
+    ) {
+        return getDelegate().createUsersWithListInput(user);
+    }
+
+
+    /**
+     * DELETE /user/{username} : Delete user
+     * This can only be done by the logged in user.
+     *
+     * @param username The name that needs to be deleted (required)
+     * @return Invalid username supplied (status code 400)
+     *         or User not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Delete user",
+        nickname = "deleteUser",
+        notes = "This can only be done by the logged in user.",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 400, message = "Invalid username supplied"),
+        @ApiResponse(code = 404, message = "User not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.DELETE,
+        value = "/user/{username}"
+    )
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    default Void deleteUser(
+        @ApiParam(value = "The name that needs to be deleted", required = true) @PathVariable("username") String username
+    ) {
+        return getDelegate().deleteUser(username);
+    }
+
+
+    /**
+     * GET /user/{username} : Get user by user name
+     * 
+     *
+     * @param username The name that needs to be fetched. Use user1 for testing. (required)
+     * @return successful operation (status code 200)
+     *         or Invalid username supplied (status code 400)
+     *         or User not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Get user by user name",
+        nickname = "getUserByName",
+        notes = "",
+        response = User.class
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = User.class),
+        @ApiResponse(code = 400, message = "Invalid username supplied"),
+        @ApiResponse(code = 404, message = "User not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/user/{username}",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default User getUserByName(
+        @ApiParam(value = "The name that needs to be fetched. Use user1 for testing.", required = true) @PathVariable("username") String username
+    ) {
+        return getDelegate().getUserByName(username);
+    }
+
+
+    /**
+     * GET /user/login : Logs user into the system
+     * 
+     *
+     * @param username The user name for login (required)
+     * @param password The password for login in clear text (required)
+     * @return successful operation (status code 200)
+     *         or Invalid username/password supplied (status code 400)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Logs user into the system",
+        nickname = "loginUser",
+        notes = "",
+        response = String.class
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation", response = String.class),
+        @ApiResponse(code = 400, message = "Invalid username/password supplied")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/user/login",
+        produces = { "application/xml", "application/json" }
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default String loginUser(
+        @NotNull @Pattern(regexp = "^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$") @ApiParam(value = "The user name for login", required = true) @Valid @RequestParam(value = "username", required = true) String username,
+        @NotNull @ApiParam(value = "The password for login in clear text", required = true) @Valid @RequestParam(value = "password", required = true) String password
+    ) {
+        return getDelegate().loginUser(username, password);
+    }
+
+
+    /**
+     * GET /user/logout : Logs out current logged in user session
+     * 
+     *
+     * @return successful operation (status code 200)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Logs out current logged in user session",
+        nickname = "logoutUser",
+        notes = "",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 200, message = "successful operation")
+    })
+    @RequestMapping(
+        method = RequestMethod.GET,
+        value = "/user/logout"
+    )
+    @ResponseStatus(HttpStatus.OK)
+    default Void logoutUser(
+        
+    ) {
+        return getDelegate().logoutUser();
+    }
+
+
+    /**
+     * PUT /user/{username} : Updated user
+     * This can only be done by the logged in user.
+     *
+     * @param username name that need to be deleted (required)
+     * @param user Updated user object (required)
+     * @return Invalid user supplied (status code 400)
+     *         or User not found (status code 404)
+     */
+    @ApiOperation(
+        tags = { "user" },
+        value = "Updated user",
+        nickname = "updateUser",
+        notes = "This can only be done by the logged in user.",
+        authorizations = {
+            @Authorization(value = "api_key")
+         }
+    )
+    @ApiResponses({
+        @ApiResponse(code = 400, message = "Invalid user supplied"),
+        @ApiResponse(code = 404, message = "User not found")
+    })
+    @RequestMapping(
+        method = RequestMethod.PUT,
+        value = "/user/{username}",
+        consumes = { "application/json" }
+    )
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    default Void updateUser(
+        @ApiParam(value = "name that need to be deleted", required = true) @PathVariable("username") String username,
+        @ApiParam(value = "Updated user object", required = true) @Valid @RequestBody User user
+    ) {
+        return getDelegate().updateUser(username, user);
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/UserApiController.java

@@ -0,0 +1,45 @@
+package org.openapitools.api;
+
+import java.util.List;
+import java.time.OffsetDateTime;
+import org.openapitools.model.User;
+
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.CookieValue;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.validation.constraints.*;
+import javax.validation.Valid;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Controller
+@RequestMapping("${openapi.openAPIPetstore.base-path:/v2}")
+public class UserApiController implements UserApi {
+
+    private final UserApiDelegate delegate;
+
+    public UserApiController(@Autowired(required = false) UserApiDelegate delegate) {
+        this.delegate = Optional.ofNullable(delegate).orElse(new UserApiDelegate() {});
+    }
+
+    @Override
+    public UserApiDelegate getDelegate() {
+        return delegate;
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/api/UserApiDelegate.java

@@ -0,0 +1,153 @@
+package org.openapitools.api;
+
+import java.util.List;
+import java.time.OffsetDateTime;
+import org.openapitools.model.User;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import javax.annotation.Generated;
+
+/**
+ * A delegate to be called by the {@link UserApiController}}.
+ * Implement this interface with a {@link org.springframework.stereotype.Service} annotated class.
+ */
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public interface UserApiDelegate {
+
+    default Optional<NativeWebRequest> getRequest() {
+        return Optional.empty();
+    }
+
+    /**
+     * POST /user : Create user
+     * This can only be done by the logged in user.
+     *
+     * @param user Created user object (required)
+     * @return successful operation (status code 200)
+     * @see UserApi#createUser
+     */
+    default Void createUser(User user) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * POST /user/createWithArray : Creates list of users with given input array
+     * 
+     *
+     * @param user List of user object (required)
+     * @return successful operation (status code 200)
+     * @see UserApi#createUsersWithArrayInput
+     */
+    default Void createUsersWithArrayInput(List<User> user) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * POST /user/createWithList : Creates list of users with given input array
+     * 
+     *
+     * @param user List of user object (required)
+     * @return successful operation (status code 200)
+     * @see UserApi#createUsersWithListInput
+     */
+    default Void createUsersWithListInput(List<User> user) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * DELETE /user/{username} : Delete user
+     * This can only be done by the logged in user.
+     *
+     * @param username The name that needs to be deleted (required)
+     * @return Invalid username supplied (status code 400)
+     *         or User not found (status code 404)
+     * @see UserApi#deleteUser
+     */
+    default Void deleteUser(String username) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /user/{username} : Get user by user name
+     * 
+     *
+     * @param username The name that needs to be fetched. Use user1 for testing. (required)
+     * @return successful operation (status code 200)
+     *         or Invalid username supplied (status code 400)
+     *         or User not found (status code 404)
+     * @see UserApi#getUserByName
+     */
+    default User getUserByName(String username) {
+        getRequest().ifPresent(request -> {
+            for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
+                    String exampleString = "{ \"firstName\" : \"firstName\", \"lastName\" : \"lastName\", \"password\" : \"password\", \"userStatus\" : 6, \"phone\" : \"phone\", \"id\" : 0, \"email\" : \"email\", \"username\" : \"username\" }";
+                    ApiUtil.setExampleResponse(request, "application/json", exampleString);
+                    break;
+                }
+                if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
+                    String exampleString = "<User> <id>123456789</id> <username>aeiou</username> <firstName>aeiou</firstName> <lastName>aeiou</lastName> <email>aeiou</email> <password>aeiou</password> <phone>aeiou</phone> <userStatus>123</userStatus> </User>";
+                    ApiUtil.setExampleResponse(request, "application/xml", exampleString);
+                    break;
+                }
+            }
+        });
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /user/login : Logs user into the system
+     * 
+     *
+     * @param username The user name for login (required)
+     * @param password The password for login in clear text (required)
+     * @return successful operation (status code 200)
+     *         or Invalid username/password supplied (status code 400)
+     * @see UserApi#loginUser
+     */
+    default String loginUser(String username,
+        String password) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * GET /user/logout : Logs out current logged in user session
+     * 
+     *
+     * @return successful operation (status code 200)
+     * @see UserApi#logoutUser
+     */
+    default Void logoutUser() {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+    /**
+     * PUT /user/{username} : Updated user
+     * This can only be done by the logged in user.
+     *
+     * @param username name that need to be deleted (required)
+     * @param user Updated user object (required)
+     * @return Invalid user supplied (status code 400)
+     *         or User not found (status code 404)
+     * @see UserApi#updateUser
+     */
+    default Void updateUser(String username,
+        User user) {
+        throw new IllegalArgumentException("Not implemented");
+
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/configuration/HomeController.java

@@ -0,0 +1,28 @@
+package org.openapitools.configuration;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.GetMapping;
+
+/**
+ * Home redirection to OpenAPI api documentation
+ */
+@Controller
+public class HomeController {
+
+    static final String API_DOCS_PATH = "/v2/api-docs";
+
+    @GetMapping(value = "/swagger-config.yaml", produces = "text/plain")
+    @ResponseBody
+    public String swaggerConfig() {
+        return "url: " + API_DOCS_PATH + "\n";
+    }
+
+    @RequestMapping("/")
+    public String index() {
+        return "redirect:swagger-ui.html";
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/configuration/SpringFoxConfiguration.java

@@ -0,0 +1,71 @@
+package org.openapitools.configuration;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import org.springframework.web.util.UriComponentsBuilder;
+import springfox.documentation.builders.ApiInfoBuilder;
+import springfox.documentation.builders.RequestHandlerSelectors;
+import springfox.documentation.service.ApiInfo;
+import springfox.documentation.service.Contact;
+import springfox.documentation.spi.DocumentationType;
+import springfox.documentation.spring.web.paths.Paths;
+import springfox.documentation.spring.web.paths.RelativePathProvider;
+import springfox.documentation.spring.web.plugins.Docket;
+import springfox.documentation.swagger2.annotations.EnableSwagger2;
+
+import javax.annotation.Generated;
+import javax.servlet.ServletContext;
+
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+@Configuration
+@EnableSwagger2
+public class SpringFoxConfiguration {
+
+    ApiInfo apiInfo() {
+        return new ApiInfoBuilder()
+            .title("OpenAPI Petstore")
+            .description("This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.")
+            .license("Apache-2.0")
+            .licenseUrl("https://www.apache.org/licenses/LICENSE-2.0.html")
+            .termsOfServiceUrl("")
+            .version("1.0.0")
+            .contact(new Contact("","", ""))
+            .build();
+    }
+
+    @Bean
+    public Docket customImplementation(ServletContext servletContext, @Value("${openapi.openAPIPetstore.base-path:/v2}") String basePath) {
+        return new Docket(DocumentationType.SWAGGER_2)
+                .select()
+                    .apis(RequestHandlerSelectors.basePackage("org.openapitools.api"))
+                    .build()
+                .pathProvider(new BasePathAwareRelativePathProvider(servletContext, basePath))
+                .directModelSubstitute(java.time.LocalDate.class, java.sql.Date.class)
+                .directModelSubstitute(java.time.OffsetDateTime.class, java.util.Date.class)
+                .apiInfo(apiInfo());
+    }
+
+    class BasePathAwareRelativePathProvider extends RelativePathProvider {
+        private String basePath;
+
+        public BasePathAwareRelativePathProvider(ServletContext servletContext, String basePath) {
+            super(servletContext);
+            this.basePath = basePath;
+        }
+
+        @Override
+        protected String applicationPath() {
+            return  Paths.removeAdjacentForwardSlashes(UriComponentsBuilder.fromPath(super.applicationPath()).path(basePath).build().toString());
+        }
+
+        @Override
+        public String getOperationPath(String operationPath) {
+            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromPath("/");
+            return Paths.removeAdjacentForwardSlashes(
+                    uriComponentsBuilder.path(operationPath.replaceFirst("^" + basePath, "")).build().toString());
+        }
+    }
+
+}

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/Category.java

@@ -0,0 +1,109 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * A category for a pet
+ */
+
+@ApiModel(description = "A category for a pet")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class Category {
+
+  @JsonProperty("id")
+  private Long id;
+
+  @JsonProperty("name")
+  private String name;
+
+  public Category id(Long id) {
+    this.id = id;
+    return this;
+  }
+
+  /**
+   * Get id
+   * @return id
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public Category name(String name) {
+    this.name = name;
+    return this;
+  }
+
+  /**
+   * Get name
+   * @return name
+  */
+  @Pattern(regexp = "^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$") 
+  @ApiModelProperty(value = "")
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Category category = (Category) o;
+    return Objects.equals(this.id, category.id) &&
+        Objects.equals(this.name, category.name);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, name);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Category {\n");
+    sb.append("    id: ").append(toIndentedString(id)).append("\n");
+    sb.append("    name: ").append(toIndentedString(name)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/ModelApiResponse.java

@@ -0,0 +1,135 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * Describes the result of uploading an image resource
+ */
+
+@ApiModel(description = "Describes the result of uploading an image resource")
+@JsonTypeName("ApiResponse")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class ModelApiResponse {
+
+  @JsonProperty("code")
+  private Integer code;
+
+  @JsonProperty("type")
+  private String type;
+
+  @JsonProperty("message")
+  private String message;
+
+  public ModelApiResponse code(Integer code) {
+    this.code = code;
+    return this;
+  }
+
+  /**
+   * Get code
+   * @return code
+  */
+  
+  @ApiModelProperty(value = "")
+  public Integer getCode() {
+    return code;
+  }
+
+  public void setCode(Integer code) {
+    this.code = code;
+  }
+
+  public ModelApiResponse type(String type) {
+    this.type = type;
+    return this;
+  }
+
+  /**
+   * Get type
+   * @return type
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getType() {
+    return type;
+  }
+
+  public void setType(String type) {
+    this.type = type;
+  }
+
+  public ModelApiResponse message(String message) {
+    this.message = message;
+    return this;
+  }
+
+  /**
+   * Get message
+   * @return message
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getMessage() {
+    return message;
+  }
+
+  public void setMessage(String message) {
+    this.message = message;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    ModelApiResponse _apiResponse = (ModelApiResponse) o;
+    return Objects.equals(this.code, _apiResponse.code) &&
+        Objects.equals(this.type, _apiResponse.type) &&
+        Objects.equals(this.message, _apiResponse.message);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(code, type, message);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class ModelApiResponse {\n");
+    sb.append("    code: ").append(toIndentedString(code)).append("\n");
+    sb.append("    type: ").append(toIndentedString(type)).append("\n");
+    sb.append("    message: ").append(toIndentedString(message)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/Order.java

@@ -0,0 +1,246 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import java.time.OffsetDateTime;
+import org.springframework.format.annotation.DateTimeFormat;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * An order for a pets from the pet store
+ */
+
+@ApiModel(description = "An order for a pets from the pet store")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class Order {
+
+  @JsonProperty("id")
+  private Long id;
+
+  @JsonProperty("petId")
+  private Long petId;
+
+  @JsonProperty("quantity")
+  private Integer quantity;
+
+  @JsonProperty("shipDate")
+  @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+  private OffsetDateTime shipDate;
+
+  /**
+   * Order Status
+   */
+  public enum StatusEnum {
+    PLACED("placed"),
+    
+    APPROVED("approved"),
+    
+    DELIVERED("delivered");
+
+    private String value;
+
+    StatusEnum(String value) {
+      this.value = value;
+    }
+
+    @JsonValue
+    public String getValue() {
+      return value;
+    }
+
+    @Override
+    public String toString() {
+      return String.valueOf(value);
+    }
+
+    @JsonCreator
+    public static StatusEnum fromValue(String value) {
+      for (StatusEnum b : StatusEnum.values()) {
+        if (b.value.equals(value)) {
+          return b;
+        }
+      }
+      throw new IllegalArgumentException("Unexpected value '" + value + "'");
+    }
+  }
+
+  @JsonProperty("status")
+  private StatusEnum status;
+
+  @JsonProperty("complete")
+  private Boolean complete = false;
+
+  public Order id(Long id) {
+    this.id = id;
+    return this;
+  }
+
+  /**
+   * Get id
+   * @return id
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public Order petId(Long petId) {
+    this.petId = petId;
+    return this;
+  }
+
+  /**
+   * Get petId
+   * @return petId
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getPetId() {
+    return petId;
+  }
+
+  public void setPetId(Long petId) {
+    this.petId = petId;
+  }
+
+  public Order quantity(Integer quantity) {
+    this.quantity = quantity;
+    return this;
+  }
+
+  /**
+   * Get quantity
+   * @return quantity
+  */
+  
+  @ApiModelProperty(value = "")
+  public Integer getQuantity() {
+    return quantity;
+  }
+
+  public void setQuantity(Integer quantity) {
+    this.quantity = quantity;
+  }
+
+  public Order shipDate(OffsetDateTime shipDate) {
+    this.shipDate = shipDate;
+    return this;
+  }
+
+  /**
+   * Get shipDate
+   * @return shipDate
+  */
+  @Valid 
+  @ApiModelProperty(value = "")
+  public OffsetDateTime getShipDate() {
+    return shipDate;
+  }
+
+  public void setShipDate(OffsetDateTime shipDate) {
+    this.shipDate = shipDate;
+  }
+
+  public Order status(StatusEnum status) {
+    this.status = status;
+    return this;
+  }
+
+  /**
+   * Order Status
+   * @return status
+  */
+  
+  @ApiModelProperty(value = "Order Status")
+  public StatusEnum getStatus() {
+    return status;
+  }
+
+  public void setStatus(StatusEnum status) {
+    this.status = status;
+  }
+
+  public Order complete(Boolean complete) {
+    this.complete = complete;
+    return this;
+  }
+
+  /**
+   * Get complete
+   * @return complete
+  */
+  
+  @ApiModelProperty(value = "")
+  public Boolean getComplete() {
+    return complete;
+  }
+
+  public void setComplete(Boolean complete) {
+    this.complete = complete;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Order order = (Order) o;
+    return Objects.equals(this.id, order.id) &&
+        Objects.equals(this.petId, order.petId) &&
+        Objects.equals(this.quantity, order.quantity) &&
+        Objects.equals(this.shipDate, order.shipDate) &&
+        Objects.equals(this.status, order.status) &&
+        Objects.equals(this.complete, order.complete);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, petId, quantity, shipDate, status, complete);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Order {\n");
+    sb.append("    id: ").append(toIndentedString(id)).append("\n");
+    sb.append("    petId: ").append(toIndentedString(petId)).append("\n");
+    sb.append("    quantity: ").append(toIndentedString(quantity)).append("\n");
+    sb.append("    shipDate: ").append(toIndentedString(shipDate)).append("\n");
+    sb.append("    status: ").append(toIndentedString(status)).append("\n");
+    sb.append("    complete: ").append(toIndentedString(complete)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/Pet.java

@@ -0,0 +1,279 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import java.util.ArrayList;
+import java.util.List;
+import org.openapitools.model.Category;
+import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * A pet for sale in the pet store
+ */
+
+@ApiModel(description = "A pet for sale in the pet store")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class Pet {
+
+  @JsonProperty("id")
+  private Long id;
+
+  @JsonProperty("category")
+  private Category category;
+
+  @JsonProperty("name")
+  private String name;
+
+  @JsonProperty("photoUrls")
+  @Valid
+  private List<String> photoUrls = new ArrayList<>();
+
+  @JsonProperty("tags")
+  @Valid
+  private List<@Valid Tag> tags = null;
+
+  /**
+   * pet status in the store
+   */
+  public enum StatusEnum {
+    AVAILABLE("available"),
+    
+    PENDING("pending"),
+    
+    SOLD("sold");
+
+    private String value;
+
+    StatusEnum(String value) {
+      this.value = value;
+    }
+
+    @JsonValue
+    public String getValue() {
+      return value;
+    }
+
+    @Override
+    public String toString() {
+      return String.valueOf(value);
+    }
+
+    @JsonCreator
+    public static StatusEnum fromValue(String value) {
+      for (StatusEnum b : StatusEnum.values()) {
+        if (b.value.equals(value)) {
+          return b;
+        }
+      }
+      throw new IllegalArgumentException("Unexpected value '" + value + "'");
+    }
+  }
+
+  @JsonProperty("status")
+  private StatusEnum status;
+
+  /**
+   * Default constructor
+   * @deprecated Use {@link Pet#Pet(String, List<String>)}
+   */
+  @Deprecated
+  public Pet() {
+    super();
+  }
+
+  /**
+   * Constructor with only required parameters
+   */
+  public Pet(String name, List<String> photoUrls) {
+    this.name = name;
+    this.photoUrls = photoUrls;
+  }
+
+  public Pet id(Long id) {
+    this.id = id;
+    return this;
+  }
+
+  /**
+   * Get id
+   * @return id
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public Pet category(Category category) {
+    this.category = category;
+    return this;
+  }
+
+  /**
+   * Get category
+   * @return category
+  */
+  @Valid 
+  @ApiModelProperty(value = "")
+  public Category getCategory() {
+    return category;
+  }
+
+  public void setCategory(Category category) {
+    this.category = category;
+  }
+
+  public Pet name(String name) {
+    this.name = name;
+    return this;
+  }
+
+  /**
+   * Get name
+   * @return name
+  */
+  @NotNull 
+  @ApiModelProperty(example = "doggie", required = true, value = "")
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Pet photoUrls(List<String> photoUrls) {
+    this.photoUrls = photoUrls;
+    return this;
+  }
+
+  public Pet addPhotoUrlsItem(String photoUrlsItem) {
+    this.photoUrls.add(photoUrlsItem);
+    return this;
+  }
+
+  /**
+   * Get photoUrls
+   * @return photoUrls
+  */
+  @NotNull 
+  @ApiModelProperty(required = true, value = "")
+  public List<String> getPhotoUrls() {
+    return photoUrls;
+  }
+
+  public void setPhotoUrls(List<String> photoUrls) {
+    this.photoUrls = photoUrls;
+  }
+
+  public Pet tags(List<@Valid Tag> tags) {
+    this.tags = tags;
+    return this;
+  }
+
+  public Pet addTagsItem(Tag tagsItem) {
+    if (this.tags == null) {
+      this.tags = new ArrayList<>();
+    }
+    this.tags.add(tagsItem);
+    return this;
+  }
+
+  /**
+   * Get tags
+   * @return tags
+  */
+  @Valid 
+  @ApiModelProperty(value = "")
+  public List<@Valid Tag> getTags() {
+    return tags;
+  }
+
+  public void setTags(List<@Valid Tag> tags) {
+    this.tags = tags;
+  }
+
+  public Pet status(StatusEnum status) {
+    this.status = status;
+    return this;
+  }
+
+  /**
+   * pet status in the store
+   * @return status
+  */
+  
+  @ApiModelProperty(value = "pet status in the store")
+  public StatusEnum getStatus() {
+    return status;
+  }
+
+  public void setStatus(StatusEnum status) {
+    this.status = status;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Pet pet = (Pet) o;
+    return Objects.equals(this.id, pet.id) &&
+        Objects.equals(this.category, pet.category) &&
+        Objects.equals(this.name, pet.name) &&
+        Objects.equals(this.photoUrls, pet.photoUrls) &&
+        Objects.equals(this.tags, pet.tags) &&
+        Objects.equals(this.status, pet.status);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, category, name, photoUrls, tags, status);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Pet {\n");
+    sb.append("    id: ").append(toIndentedString(id)).append("\n");
+    sb.append("    category: ").append(toIndentedString(category)).append("\n");
+    sb.append("    name: ").append(toIndentedString(name)).append("\n");
+    sb.append("    photoUrls: ").append(toIndentedString(photoUrls)).append("\n");
+    sb.append("    tags: ").append(toIndentedString(tags)).append("\n");
+    sb.append("    status: ").append(toIndentedString(status)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/Tag.java

@@ -0,0 +1,109 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * A tag for a pet
+ */
+
+@ApiModel(description = "A tag for a pet")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class Tag {
+
+  @JsonProperty("id")
+  private Long id;
+
+  @JsonProperty("name")
+  private String name;
+
+  public Tag id(Long id) {
+    this.id = id;
+    return this;
+  }
+
+  /**
+   * Get id
+   * @return id
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public Tag name(String name) {
+    this.name = name;
+    return this;
+  }
+
+  /**
+   * Get name
+   * @return name
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Tag tag = (Tag) o;
+    return Objects.equals(this.id, tag.id) &&
+        Objects.equals(this.name, tag.name);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, name);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Tag {\n");
+    sb.append("    id: ").append(toIndentedString(id)).append("\n");
+    sb.append("    name: ").append(toIndentedString(name)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/java/org/openapitools/model/User.java

@@ -0,0 +1,253 @@
+package org.openapitools.model;
+
+import java.net.URI;
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
+import java.time.OffsetDateTime;
+import javax.validation.Valid;
+import javax.validation.constraints.*;
+
+
+import java.util.*;
+import javax.annotation.Generated;
+
+/**
+ * A User who is purchasing from the pet store
+ */
+
+@ApiModel(description = "A User who is purchasing from the pet store")
+@Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
+public class User {
+
+  @JsonProperty("id")
+  private Long id;
+
+  @JsonProperty("username")
+  private String username;
+
+  @JsonProperty("firstName")
+  private String firstName;
+
+  @JsonProperty("lastName")
+  private String lastName;
+
+  @JsonProperty("email")
+  private String email;
+
+  @JsonProperty("password")
+  private String password;
+
+  @JsonProperty("phone")
+  private String phone;
+
+  @JsonProperty("userStatus")
+  private Integer userStatus;
+
+  public User id(Long id) {
+    this.id = id;
+    return this;
+  }
+
+  /**
+   * Get id
+   * @return id
+  */
+  
+  @ApiModelProperty(value = "")
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public User username(String username) {
+    this.username = username;
+    return this;
+  }
+
+  /**
+   * Get username
+   * @return username
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getUsername() {
+    return username;
+  }
+
+  public void setUsername(String username) {
+    this.username = username;
+  }
+
+  public User firstName(String firstName) {
+    this.firstName = firstName;
+    return this;
+  }
+
+  /**
+   * Get firstName
+   * @return firstName
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public void setFirstName(String firstName) {
+    this.firstName = firstName;
+  }
+
+  public User lastName(String lastName) {
+    this.lastName = lastName;
+    return this;
+  }
+
+  /**
+   * Get lastName
+   * @return lastName
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getLastName() {
+    return lastName;
+  }
+
+  public void setLastName(String lastName) {
+    this.lastName = lastName;
+  }
+
+  public User email(String email) {
+    this.email = email;
+    return this;
+  }
+
+  /**
+   * Get email
+   * @return email
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getEmail() {
+    return email;
+  }
+
+  public void setEmail(String email) {
+    this.email = email;
+  }
+
+  public User password(String password) {
+    this.password = password;
+    return this;
+  }
+
+  /**
+   * Get password
+   * @return password
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getPassword() {
+    return password;
+  }
+
+  public void setPassword(String password) {
+    this.password = password;
+  }
+
+  public User phone(String phone) {
+    this.phone = phone;
+    return this;
+  }
+
+  /**
+   * Get phone
+   * @return phone
+  */
+  
+  @ApiModelProperty(value = "")
+  public String getPhone() {
+    return phone;
+  }
+
+  public void setPhone(String phone) {
+    this.phone = phone;
+  }
+
+  public User userStatus(Integer userStatus) {
+    this.userStatus = userStatus;
+    return this;
+  }
+
+  /**
+   * User Status
+   * @return userStatus
+  */
+  
+  @ApiModelProperty(value = "User Status")
+  public Integer getUserStatus() {
+    return userStatus;
+  }
+
+  public void setUserStatus(Integer userStatus) {
+    this.userStatus = userStatus;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    User user = (User) o;
+    return Objects.equals(this.id, user.id) &&
+        Objects.equals(this.username, user.username) &&
+        Objects.equals(this.firstName, user.firstName) &&
+        Objects.equals(this.lastName, user.lastName) &&
+        Objects.equals(this.email, user.email) &&
+        Objects.equals(this.password, user.password) &&
+        Objects.equals(this.phone, user.phone) &&
+        Objects.equals(this.userStatus, user.userStatus);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(id, username, firstName, lastName, email, password, phone, userStatus);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class User {\n");
+    sb.append("    id: ").append(toIndentedString(id)).append("\n");
+    sb.append("    username: ").append(toIndentedString(username)).append("\n");
+    sb.append("    firstName: ").append(toIndentedString(firstName)).append("\n");
+    sb.append("    lastName: ").append(toIndentedString(lastName)).append("\n");
+    sb.append("    email: ").append(toIndentedString(email)).append("\n");
+    sb.append("    password: ").append(toIndentedString(password)).append("\n");
+    sb.append("    phone: ").append(toIndentedString(phone)).append("\n");
+    sb.append("    userStatus: ").append(toIndentedString(userStatus)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+

samples/server/petstore/springboot-delegate-no-response-entity/src/main/resources/application.properties

@@ -0,0 +1,3 @@
+server.port=8080
+spring.jackson.date-format=org.openapitools.RFC3339DateFormat
+spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS=false

samples/server/petstore/springboot-delegate-no-response-entity/src/main/resources/openapi.yaml

@@ -0,0 +1,880 @@
+openapi: 3.0.0
+info:
+  description: "This is a sample server Petstore server. For this sample, you can\
+    \ use the api key `special-key` to test the authorization filters."
+  license:
+    name: Apache-2.0
+    url: https://www.apache.org/licenses/LICENSE-2.0.html
+  title: OpenAPI Petstore
+  version: 1.0.0
+externalDocs:
+  description: Find out more about Swagger
+  url: http://swagger.io
+servers:
+- url: http://petstore.swagger.io/v2
+tags:
+- description: Everything about your Pets
+  name: pet
+- description: Access to Petstore orders
+  name: store
+- description: Operations about user
+  name: user
+paths:
+  /pet:
+    post:
+      description: ""
+      operationId: addPet
+      requestBody:
+        $ref: '#/components/requestBodies/Pet'
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Pet'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+          description: successful operation
+        "405":
+          description: Invalid input
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+      summary: Add a new pet to the store
+      tags:
+      - pet
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+    put:
+      description: ""
+      externalDocs:
+        description: API documentation for the updatePet operation
+        url: http://petstore.swagger.io/v2/doc/updatePet
+      operationId: updatePet
+      requestBody:
+        $ref: '#/components/requestBodies/Pet'
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Pet'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+          description: successful operation
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Pet not found
+        "405":
+          description: Validation exception
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+      summary: Update an existing pet
+      tags:
+      - pet
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+  /pet/findByStatus:
+    get:
+      description: Multiple status values can be provided with comma separated strings
+      operationId: findPetsByStatus
+      parameters:
+      - deprecated: true
+        description: Status values that need to be considered for filter
+        explode: false
+        in: query
+        name: status
+        required: true
+        schema:
+          items:
+            default: available
+            enum:
+            - available
+            - pending
+            - sold
+            type: string
+          type: array
+        style: form
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                items:
+                  $ref: '#/components/schemas/Pet'
+                type: array
+            application/json:
+              schema:
+                items:
+                  $ref: '#/components/schemas/Pet'
+                type: array
+          description: successful operation
+        "400":
+          description: Invalid status value
+      security:
+      - petstore_auth:
+        - read:pets
+      summary: Finds Pets by status
+      tags:
+      - pet
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+  /pet/findByTags:
+    get:
+      deprecated: true
+      description: "Multiple tags can be provided with comma separated strings. Use\
+        \ tag1, tag2, tag3 for testing."
+      operationId: findPetsByTags
+      parameters:
+      - description: Tags to filter by
+        explode: false
+        in: query
+        name: tags
+        required: true
+        schema:
+          items:
+            type: string
+          type: array
+        style: form
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                items:
+                  $ref: '#/components/schemas/Pet'
+                type: array
+            application/json:
+              schema:
+                items:
+                  $ref: '#/components/schemas/Pet'
+                type: array
+          description: successful operation
+        "400":
+          description: Invalid tag value
+      security:
+      - petstore_auth:
+        - read:pets
+      summary: Finds Pets by tags
+      tags:
+      - pet
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+  /pet/{petId}:
+    delete:
+      description: ""
+      operationId: deletePet
+      parameters:
+      - explode: false
+        in: header
+        name: api_key
+        required: false
+        schema:
+          type: string
+        style: simple
+      - description: Pet id to delete
+        explode: false
+        in: path
+        name: petId
+        required: true
+        schema:
+          format: int64
+          type: integer
+        style: simple
+      responses:
+        "400":
+          description: Invalid pet value
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+      summary: Deletes a pet
+      tags:
+      - pet
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+    get:
+      description: Returns a single pet
+      operationId: getPetById
+      parameters:
+      - description: ID of pet to return
+        explode: false
+        in: path
+        name: petId
+        required: true
+        schema:
+          format: int64
+          type: integer
+        style: simple
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Pet'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+          description: successful operation
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Pet not found
+      security:
+      - api_key: []
+      summary: Find pet by ID
+      tags:
+      - pet
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+    post:
+      description: ""
+      operationId: updatePetWithForm
+      parameters:
+      - description: ID of pet that needs to be updated
+        explode: false
+        in: path
+        name: petId
+        required: true
+        schema:
+          format: int64
+          type: integer
+        style: simple
+      requestBody:
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/updatePetWithForm_request'
+      responses:
+        "405":
+          description: Invalid input
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+      summary: Updates a pet in the store with form data
+      tags:
+      - pet
+      x-content-type: application/x-www-form-urlencoded
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+  /pet/{petId}/uploadImage:
+    post:
+      description: ""
+      operationId: uploadFile
+      parameters:
+      - description: ID of pet to update
+        explode: false
+        in: path
+        name: petId
+        required: true
+        schema:
+          format: int64
+          type: integer
+        style: simple
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              $ref: '#/components/schemas/uploadFile_request'
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiResponse'
+          description: successful operation
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+      summary: uploads an image
+      tags:
+      - pet
+      x-content-type: multipart/form-data
+      x-accepts: application/json
+      x-tags:
+      - tag: pet
+  /store/inventory:
+    get:
+      description: Returns a map of status codes to quantities
+      operationId: getInventory
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                additionalProperties:
+                  format: int32
+                  type: integer
+                type: object
+          description: successful operation
+      security:
+      - api_key: []
+      summary: Returns pet inventories by status
+      tags:
+      - store
+      x-accepts: application/json
+      x-tags:
+      - tag: store
+  /store/order:
+    post:
+      description: ""
+      operationId: placeOrder
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Order'
+        description: order placed for purchasing the pet
+        required: true
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Order'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+          description: successful operation
+        "400":
+          description: Invalid Order
+      summary: Place an order for a pet
+      tags:
+      - store
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: store
+  /store/order/{orderId}:
+    delete:
+      description: For valid response try integer IDs with value < 1000. Anything
+        above 1000 or nonintegers will generate API errors
+      operationId: deleteOrder
+      parameters:
+      - description: ID of the order that needs to be deleted
+        explode: false
+        in: path
+        name: orderId
+        required: true
+        schema:
+          type: string
+        style: simple
+      responses:
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Order not found
+      summary: Delete purchase order by ID
+      tags:
+      - store
+      x-accepts: application/json
+      x-tags:
+      - tag: store
+    get:
+      description: For valid response try integer IDs with value <= 5 or > 10. Other
+        values will generate exceptions
+      operationId: getOrderById
+      parameters:
+      - description: ID of pet that needs to be fetched
+        explode: false
+        in: path
+        name: orderId
+        required: true
+        schema:
+          format: int64
+          maximum: 5
+          minimum: 1
+          type: integer
+        style: simple
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Order'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+          description: successful operation
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Order not found
+      summary: Find purchase order by ID
+      tags:
+      - store
+      x-accepts: application/json
+      x-tags:
+      - tag: store
+  /user:
+    post:
+      description: This can only be done by the logged in user.
+      operationId: createUser
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/User'
+        description: Created user object
+        required: true
+      responses:
+        default:
+          description: successful operation
+      security:
+      - api_key: []
+      summary: Create user
+      tags:
+      - user
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+  /user/createWithArray:
+    post:
+      description: ""
+      operationId: createUsersWithArrayInput
+      requestBody:
+        $ref: '#/components/requestBodies/UserArray'
+      responses:
+        default:
+          description: successful operation
+      security:
+      - api_key: []
+      summary: Creates list of users with given input array
+      tags:
+      - user
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+  /user/createWithList:
+    post:
+      description: ""
+      operationId: createUsersWithListInput
+      requestBody:
+        $ref: '#/components/requestBodies/UserArray'
+      responses:
+        default:
+          description: successful operation
+      security:
+      - api_key: []
+      summary: Creates list of users with given input array
+      tags:
+      - user
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+  /user/login:
+    get:
+      description: ""
+      operationId: loginUser
+      parameters:
+      - description: The user name for login
+        explode: true
+        in: query
+        name: username
+        required: true
+        schema:
+          pattern: "^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$"
+          type: string
+        style: form
+      - description: The password for login in clear text
+        explode: true
+        in: query
+        name: password
+        required: true
+        schema:
+          type: string
+        style: form
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                type: string
+            application/json:
+              schema:
+                type: string
+          description: successful operation
+          headers:
+            Set-Cookie:
+              description: Cookie authentication key for use with the `api_key` apiKey
+                authentication.
+              explode: false
+              schema:
+                example: AUTH_KEY=abcde12345; Path=/; HttpOnly
+                type: string
+              style: simple
+            X-Rate-Limit:
+              description: calls per hour allowed by the user
+              explode: false
+              schema:
+                format: int32
+                type: integer
+              style: simple
+            X-Expires-After:
+              description: date in UTC when token expires
+              explode: false
+              schema:
+                format: date-time
+                type: string
+              style: simple
+        "400":
+          description: Invalid username/password supplied
+      summary: Logs user into the system
+      tags:
+      - user
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+  /user/logout:
+    get:
+      description: ""
+      operationId: logoutUser
+      responses:
+        default:
+          description: successful operation
+      security:
+      - api_key: []
+      summary: Logs out current logged in user session
+      tags:
+      - user
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+  /user/{username}:
+    delete:
+      description: This can only be done by the logged in user.
+      operationId: deleteUser
+      parameters:
+      - description: The name that needs to be deleted
+        explode: false
+        in: path
+        name: username
+        required: true
+        schema:
+          type: string
+        style: simple
+      responses:
+        "400":
+          description: Invalid username supplied
+        "404":
+          description: User not found
+      security:
+      - api_key: []
+      summary: Delete user
+      tags:
+      - user
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+    get:
+      description: ""
+      operationId: getUserByName
+      parameters:
+      - description: The name that needs to be fetched. Use user1 for testing.
+        explode: false
+        in: path
+        name: username
+        required: true
+        schema:
+          type: string
+        style: simple
+      responses:
+        "200":
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/User'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+          description: successful operation
+        "400":
+          description: Invalid username supplied
+        "404":
+          description: User not found
+      summary: Get user by user name
+      tags:
+      - user
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+    put:
+      description: This can only be done by the logged in user.
+      operationId: updateUser
+      parameters:
+      - description: name that need to be deleted
+        explode: false
+        in: path
+        name: username
+        required: true
+        schema:
+          type: string
+        style: simple
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/User'
+        description: Updated user object
+        required: true
+      responses:
+        "400":
+          description: Invalid user supplied
+        "404":
+          description: User not found
+      security:
+      - api_key: []
+      summary: Updated user
+      tags:
+      - user
+      x-content-type: application/json
+      x-accepts: application/json
+      x-tags:
+      - tag: user
+components:
+  requestBodies:
+    UserArray:
+      content:
+        application/json:
+          schema:
+            items:
+              $ref: '#/components/schemas/User'
+            type: array
+      description: List of user object
+      required: true
+    Pet:
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/Pet'
+        application/xml:
+          schema:
+            $ref: '#/components/schemas/Pet'
+      description: Pet object that needs to be added to the store
+      required: true
+  schemas:
+    Order:
+      description: An order for a pets from the pet store
+      example:
+        petId: 6
+        quantity: 1
+        id: 0
+        shipDate: 2000-01-23T04:56:07.000+00:00
+        complete: false
+        status: placed
+      properties:
+        id:
+          format: int64
+          type: integer
+        petId:
+          format: int64
+          type: integer
+        quantity:
+          format: int32
+          type: integer
+        shipDate:
+          format: date-time
+          type: string
+        status:
+          description: Order Status
+          enum:
+          - placed
+          - approved
+          - delivered
+          type: string
+        complete:
+          default: false
+          type: boolean
+      title: Pet Order
+      type: object
+      xml:
+        name: Order
+    Category:
+      description: A category for a pet
+      example:
+        name: name
+        id: 6
+      properties:
+        id:
+          format: int64
+          type: integer
+        name:
+          pattern: "^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$"
+          type: string
+      title: Pet category
+      type: object
+      xml:
+        name: Category
+    User:
+      description: A User who is purchasing from the pet store
+      example:
+        firstName: firstName
+        lastName: lastName
+        password: password
+        userStatus: 6
+        phone: phone
+        id: 0
+        email: email
+        username: username
+      properties:
+        id:
+          format: int64
+          type: integer
+        username:
+          type: string
+        firstName:
+          type: string
+        lastName:
+          type: string
+        email:
+          type: string
+        password:
+          type: string
+        phone:
+          type: string
+        userStatus:
+          description: User Status
+          format: int32
+          type: integer
+      title: a User
+      type: object
+      xml:
+        name: User
+    Tag:
+      description: A tag for a pet
+      example:
+        name: name
+        id: 1
+      properties:
+        id:
+          format: int64
+          type: integer
+        name:
+          type: string
+      title: Pet Tag
+      type: object
+      xml:
+        name: Tag
+    Pet:
+      description: A pet for sale in the pet store
+      example:
+        photoUrls:
+        - photoUrls
+        - photoUrls
+        name: doggie
+        id: 0
+        category:
+          name: name
+          id: 6
+        tags:
+        - name: name
+          id: 1
+        - name: name
+          id: 1
+        status: available
+      properties:
+        id:
+          format: int64
+          type: integer
+        category:
+          $ref: '#/components/schemas/Category'
+        name:
+          example: doggie
+          type: string
+        photoUrls:
+          items:
+            type: string
+          type: array
+          xml:
+            name: photoUrl
+            wrapped: true
+        tags:
+          items:
+            $ref: '#/components/schemas/Tag'
+          type: array
+          xml:
+            name: tag
+            wrapped: true
+        status:
+          deprecated: true
+          description: pet status in the store
+          enum:
+          - available
+          - pending
+          - sold
+          type: string
+      required:
+      - name
+      - photoUrls
+      title: a Pet
+      type: object
+      xml:
+        name: Pet
+    ApiResponse:
+      description: Describes the result of uploading an image resource
+      example:
+        code: 0
+        type: type
+        message: message
+      properties:
+        code:
+          format: int32
+          type: integer
+        type:
+          type: string
+        message:
+          type: string
+      title: An uploaded response
+      type: object
+    updatePetWithForm_request:
+      properties:
+        name:
+          description: Updated name of the pet
+          type: string
+        status:
+          description: Updated status of the pet
+          type: string
+      type: object
+    uploadFile_request:
+      properties:
+        additionalMetadata:
+          description: Additional data to pass to server
+          type: string
+        file:
+          description: file to upload
+          format: binary
+          type: string
+      type: object
+  securitySchemes:
+    petstore_auth:
+      flows:
+        implicit:
+          authorizationUrl: http://petstore.swagger.io/api/oauth/dialog
+          scopes:
+            write:pets: modify pets in your account
+            read:pets: read your pets
+      type: oauth2
+    api_key:
+      in: header
+      name: api_key
+      type: apiKey

samples/server/petstore/springboot-delegate-no-response-entity/src/main/resources/static/swagger-ui.html

@@ -0,0 +1,60 @@
+<!-- HTML for static distribution bundle build -->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Swagger UI</title>
+  <link rel="stylesheet" type="text/css" href="webjars/swagger-ui/swagger-ui.css" />
+  <link rel="icon" type="image/png" href="webjars/swagger-ui/favicon-32x32.png" sizes="32x32" />
+  <link rel="icon" type="image/png" href="webjars/swagger-ui/favicon-16x16.png" sizes="16x16" />
+  <style>
+    html
+    {
+      box-sizing: border-box;
+      overflow: -moz-scrollbars-vertical;
+      overflow-y: scroll;
+    }
+
+    *,
+    *:before,
+    *:after
+    {
+      box-sizing: inherit;
+    }
+
+    body
+    {
+      margin:0;
+      background: #fafafa;
+    }
+  </style>
+</head>
+
+<body>
+<div id="swagger-ui"></div>
+
+<script src="webjars/swagger-ui/swagger-ui-bundle.js" charset="UTF-8"> </script>
+<script src="webjars/swagger-ui/swagger-ui-standalone-preset.js" charset="UTF-8"> </script>
+<script>
+  window.onload = function() {
+    // Begin Swagger UI call region
+    const ui = SwaggerUIBundle({
+      configUrl: 'swagger-config.yaml',
+      dom_id: '#swagger-ui',
+      deepLinking: true,
+      presets: [
+        SwaggerUIBundle.presets.apis,
+        SwaggerUIStandalonePreset
+      ],
+      plugins: [
+        SwaggerUIBundle.plugins.DownloadUrl
+      ],
+      layout: "StandaloneLayout"
+    });
+    // End Swagger UI call region
+
+    window.ui = ui;
+  };
+</script>
+</body>
+</html>

samples/server/petstore/springboot-delegate-no-response-entity/src/test/java/org/openapitools/OpenApiGeneratorApplicationTests.java

@@ -0,0 +1,13 @@
+package org.openapitools;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class OpenApiGeneratorApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}