Malformed api-docs JSON when StringHttpMessageConverter is not active. Fixes #2051

bnasslahsen · bnasslahsen · commit a33e9291d8ac · 2023-02-05T21:19:30.000+01:00
diff --git a/springdoc-openapi-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java b/springdoc-openapi-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java
@@ -1236,7 +1236,7 @@ protected void initOpenAPIBuilder(Locale locale) {
 	 * @return the string
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	protected String writeYamlValue(OpenAPI openAPI) throws JsonProcessingException {
+	protected byte[] writeYamlValue(OpenAPI openAPI) throws JsonProcessingException {
 		String result;
 		ObjectMapper objectMapper = springDocProviders.yamlMapper();
 		if (springDocConfigProperties.isWriterWithOrderByKeys())
@@ -1247,7 +1247,7 @@ protected String writeYamlValue(OpenAPI openAPI) throws JsonProcessingException
 			result = objectMapper.writerFor(OpenAPI.class).writeValueAsString(openAPI);
 		else
 			result = objectMapper.writerWithDefaultPrettyPrinter().forType(OpenAPI.class).writeValueAsString(openAPI);
-		return result;
+		return result.getBytes(StandardCharsets.UTF_8);
 	}
 
 	/**
@@ -1307,7 +1307,7 @@ protected boolean isActuatorRestController(String operationPath, HandlerMethod h
 	 * @return the string
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	protected String writeJsonValue(OpenAPI openAPI) throws JsonProcessingException {
+	protected byte[] writeJsonValue(OpenAPI openAPI) throws JsonProcessingException {
 		String result;
 		ObjectMapper objectMapper = springDocProviders.jsonMapper();
 		if (springDocConfigProperties.isWriterWithOrderByKeys())
@@ -1316,7 +1316,7 @@ protected String writeJsonValue(OpenAPI openAPI) throws JsonProcessingException
 			result = objectMapper.writerFor(OpenAPI.class).writeValueAsString(openAPI);
 		else
 			result = objectMapper.writerWithDefaultPrettyPrinter().forType(OpenAPI.class).writeValueAsString(openAPI);
-		return result;
+		return result.getBytes(StandardCharsets.UTF_8);
 	}
 
 	/**
diff --git a/springdoc-openapi-common/src/main/java/org/springdoc/core/converters/JavaTypeToIgnoreConverter.java b/springdoc-openapi-common/src/main/java/org/springdoc/core/converters/JavaTypeToIgnoreConverter.java
@@ -29,7 +29,6 @@
 import io.swagger.v3.core.converter.ModelConverter;
 import io.swagger.v3.core.converter.ModelConverterContext;
 import io.swagger.v3.oas.models.media.Schema;
-import org.springdoc.core.AbstractRequestService;
 import org.springdoc.core.providers.ObjectMapperProvider;
 
 /**
diff --git a/springdoc-openapi-kotlin/src/test/kotlin/test/org/springdoc/api/app7/ExampleController.kt b/springdoc-openapi-kotlin/src/test/kotlin/test/org/springdoc/api/app7/ExampleController.kt
@@ -1,10 +1,7 @@
 package test.org.springdoc.api.app7
 
 import io.swagger.v3.oas.annotations.Parameter
-import io.swagger.v3.oas.annotations.parameters.RequestBody
 import org.springframework.web.bind.annotation.GetMapping
-import org.springframework.web.bind.annotation.PostMapping
-import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.RestController
 
diff --git a/springdoc-openapi-kotlin/src/test/kotlin/test/org/springdoc/api/app9/DemoController.kt b/springdoc-openapi-kotlin/src/test/kotlin/test/org/springdoc/api/app9/DemoController.kt
@@ -1,7 +1,9 @@
 package test.org.springdoc.api.app9
 
 import io.swagger.v3.oas.annotations.media.Schema
-import org.springframework.web.bind.annotation.*
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
 
 @RestController
 @RequestMapping("/api/demo")
diff --git a/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/MultipleOpenApiActuatorResource.java b/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/MultipleOpenApiActuatorResource.java
@@ -83,7 +83,7 @@ public MultipleOpenApiActuatorResource(List<GroupedOpenApi> groupedOpenApis, Obj
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = "/{group}", produces = MediaType.APPLICATION_JSON_VALUE)
-	public Mono<String> openapiJson(ServerHttpRequest
+	public Mono<byte[]> openapiJson(ServerHttpRequest
 			serverHttpRequest, @Value(API_DOCS_URL) String apiDocsUrl,
 			@PathVariable String group, Locale locale)
 			throws JsonProcessingException {
@@ -102,7 +102,7 @@ public Mono<String> openapiJson(ServerHttpRequest
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = "/{group}/yaml", produces = APPLICATION_OPENAPI_YAML)
-	public Mono<String> openapiYaml(ServerHttpRequest serverHttpRequest,
+	public Mono<byte[]> openapiYaml(ServerHttpRequest serverHttpRequest,
 			@Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl, @PathVariable String
 			group, Locale locale) throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiYaml(serverHttpRequest, apiDocsUrl + DEFAULT_PATH_SEPARATOR + group, locale);
diff --git a/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/MultipleOpenApiWebFluxResource.java b/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/MultipleOpenApiWebFluxResource.java
@@ -82,7 +82,7 @@ public MultipleOpenApiWebFluxResource(List<GroupedOpenApi> groupedOpenApis, Obje
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = API_DOCS_URL + "/{group}", produces = MediaType.APPLICATION_JSON_VALUE)
-	public Mono<String> openapiJson(ServerHttpRequest
+	public Mono<byte[]> openapiJson(ServerHttpRequest
 			serverHttpRequest, @Value(API_DOCS_URL) String apiDocsUrl, @PathVariable String
 			group, Locale locale) throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiJson(serverHttpRequest, apiDocsUrl + DEFAULT_PATH_SEPARATOR + group, locale);
@@ -100,7 +100,7 @@ public Mono<String> openapiJson(ServerHttpRequest
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_API_DOCS_URL_YAML + "/{group}", produces = APPLICATION_OPENAPI_YAML)
-	public Mono<String> openapiYaml(ServerHttpRequest serverHttpRequest,
+	public Mono<byte[]> openapiYaml(ServerHttpRequest serverHttpRequest,
 			@Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl, @PathVariable String
 			group, Locale locale) throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiYaml(serverHttpRequest, apiDocsUrl + DEFAULT_PATH_SEPARATOR + group, locale);
diff --git a/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiActuatorResource.java b/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiActuatorResource.java
@@ -108,7 +108,7 @@ public OpenApiActuatorResource(ObjectFactory<OpenAPIService> openAPIBuilderObjec
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_PATH_SEPARATOR, produces = MediaType.APPLICATION_JSON_VALUE)
-	public Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, Locale locale)
+	public Mono<byte[]> openapiJson(ServerHttpRequest serverHttpRequest, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiJson(serverHttpRequest, EMPTY, locale);
 	}
@@ -124,7 +124,7 @@ public Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, Locale loca
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_YAML_API_DOCS_ACTUATOR_PATH, produces = APPLICATION_OPENAPI_YAML)
-	public Mono<String> openapiYaml(ServerHttpRequest serverHttpRequest, Locale locale)
+	public Mono<byte[]> openapiYaml(ServerHttpRequest serverHttpRequest, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiYaml(serverHttpRequest, YAML, locale);
 	}
diff --git a/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiResource.java b/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiResource.java
@@ -130,7 +130,7 @@ public OpenApiResource(ObjectFactory<OpenAPIService> openAPIBuilderObjectFactory
 	 * @return the mono
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	protected Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, String apiDocsUrl, Locale locale)
+	protected Mono<byte[]> openapiJson(ServerHttpRequest serverHttpRequest, String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		calculateServerUrl(serverHttpRequest, apiDocsUrl, locale);
 		OpenAPI openAPI = this.getOpenApi(locale);
@@ -146,7 +146,7 @@ protected Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, String a
 	 * @return the mono
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	protected Mono<String> openapiYaml(ServerHttpRequest serverHttpRequest, String apiDocsUrl, Locale locale)
+	protected Mono<byte[]> openapiYaml(ServerHttpRequest serverHttpRequest, String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		calculateServerUrl(serverHttpRequest, apiDocsUrl, locale);
 		OpenAPI openAPI = this.getOpenApi(locale);
diff --git a/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiWebfluxResource.java b/springdoc-openapi-webflux-core/src/main/java/org/springdoc/webflux/api/OpenApiWebfluxResource.java
@@ -112,7 +112,7 @@ public OpenApiWebfluxResource(ObjectFactory<OpenAPIService> openAPIBuilderObject
 	@Operation(hidden = true)
 	@GetMapping(value = API_DOCS_URL, produces = MediaType.APPLICATION_JSON_VALUE)
 	@Override
-	public Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, @Value(API_DOCS_URL) String apiDocsUrl, Locale locale)
+	public Mono<byte[]> openapiJson(ServerHttpRequest serverHttpRequest, @Value(API_DOCS_URL) String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiJson(serverHttpRequest, apiDocsUrl, locale);
 	}
@@ -129,7 +129,7 @@ public Mono<String> openapiJson(ServerHttpRequest serverHttpRequest, @Value(API_
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_API_DOCS_URL_YAML, produces = APPLICATION_OPENAPI_YAML)
 	@Override
-	public Mono<String> openapiYaml(ServerHttpRequest serverHttpRequest,
+	public Mono<byte[]> openapiYaml(ServerHttpRequest serverHttpRequest,
 			@Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl, Locale locale) throws JsonProcessingException {
 		return super.openapiYaml(serverHttpRequest, apiDocsUrl, locale);
 	}
diff --git a/springdoc-openapi-webflux-core/src/test/java/test/org/springdoc/api/app81/SpringDocApp81Test.java b/springdoc-openapi-webflux-core/src/test/java/test/org/springdoc/api/app81/SpringDocApp81Test.java
@@ -23,6 +23,7 @@
 package test.org.springdoc.api.app81;
 
 import java.net.URI;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
@@ -69,7 +70,9 @@ public void shouldGenerateOperationIdsDeterministically() throws Exception {
 		when(request.getURI()).thenReturn(URI.create("http://localhost"));
 
 		String expected = getContent("results/app81.json");
-		String openApi = resource.openapiJson(request, "", Locale.US).block();
+		byte[] openApiBytes =resource.openapiJson(request, "", Locale.US).block();
+		String openApi = new String(openApiBytes, StandardCharsets.UTF_8); // for UTF-8 encoding
+
 		assertEquals(expected, openApi, true);
 	}
 
diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiActuatorResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiActuatorResource.java
@@ -82,7 +82,7 @@ public MultipleOpenApiActuatorResource(List<GroupedOpenApi> groupedOpenApis, Obj
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = "/{group}", produces = MediaType.APPLICATION_JSON_VALUE)
-	public String openapiJson(HttpServletRequest request, @PathVariable String group, Locale locale)
+	public byte[]  openapiJson(HttpServletRequest request, @PathVariable String group, Locale locale)
 			throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiJson(request, "" + DEFAULT_PATH_SEPARATOR + group, locale);
 	}
@@ -98,7 +98,7 @@ public String openapiJson(HttpServletRequest request, @PathVariable String group
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = "/{group}/yaml", produces = APPLICATION_OPENAPI_YAML)
-	public String openapiYaml(HttpServletRequest request, @PathVariable String group, Locale locale)
+	public byte[] openapiYaml(HttpServletRequest request, @PathVariable String group, Locale locale)
 			throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiYaml(request, "" + DEFAULT_PATH_SEPARATOR + group, locale);
 	}
diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiWebMvcResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiWebMvcResource.java
@@ -82,7 +82,7 @@ public MultipleOpenApiWebMvcResource(List<GroupedOpenApi> groupedOpenApis, Objec
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = API_DOCS_URL + "/{group}", produces = MediaType.APPLICATION_JSON_VALUE)
-	public String openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) String apiDocsUrl,
+	public byte[] openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) String apiDocsUrl,
 			@PathVariable String group, Locale locale)
 			throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiJson(request, apiDocsUrl + DEFAULT_PATH_SEPARATOR + group, locale);
@@ -100,7 +100,7 @@ public String openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) Strin
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_API_DOCS_URL_YAML + "/{group}", produces = APPLICATION_OPENAPI_YAML)
-	public String openapiYaml(HttpServletRequest request, @Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl,
+	public byte[] openapiYaml(HttpServletRequest request, @Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl,
 			@PathVariable String group, Locale locale)
 			throws JsonProcessingException {
 		return getOpenApiResourceOrThrow(group).openapiYaml(request, apiDocsUrl + DEFAULT_PATH_SEPARATOR + group, locale);
diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiActuatorResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiActuatorResource.java
@@ -120,9 +120,9 @@ public OpenApiActuatorResource(String groupName, ObjectFactory<OpenAPIService> o
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_PATH_SEPARATOR, produces = MediaType.APPLICATION_JSON_VALUE)
-	public String openapiJson(HttpServletRequest request, Locale locale)
+	public byte[]  openapiJson(HttpServletRequest request, Locale locale)
 			throws JsonProcessingException {
-		return super.openapiJson(request, EMPTY, locale);
+		return openapiJson(request, EMPTY, locale);
 	}
 
 
@@ -136,7 +136,7 @@ public String openapiJson(HttpServletRequest request, Locale locale)
 	 */
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_YAML_API_DOCS_ACTUATOR_PATH, produces = APPLICATION_OPENAPI_YAML)
-	public String openapiYaml(HttpServletRequest request, Locale locale)
+	public byte[] openapiYaml(HttpServletRequest request, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiYaml(request, YAML, locale);
 	}
diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java
@@ -132,7 +132,7 @@ public OpenApiResource(ObjectFactory<OpenAPIService> openAPIBuilderObjectFactory
 	 * @return the string
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	public String openapiJson(HttpServletRequest request,
+	public byte[]  openapiJson(HttpServletRequest request,
 			String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		calculateServerUrl(request, apiDocsUrl, locale);
@@ -149,7 +149,7 @@ public String openapiJson(HttpServletRequest request,
 	 * @return the string
 	 * @throws JsonProcessingException the json processing exception
 	 */
-	public String openapiYaml(HttpServletRequest request,
+	public byte[] openapiYaml(HttpServletRequest request,
 			String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		calculateServerUrl(request, apiDocsUrl, locale);
diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiWebMvcResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiWebMvcResource.java
@@ -111,7 +111,7 @@ public OpenApiWebMvcResource(ObjectFactory<OpenAPIService> openAPIBuilderObjectF
 	@Operation(hidden = true)
 	@GetMapping(value = API_DOCS_URL, produces = MediaType.APPLICATION_JSON_VALUE)
 	@Override
-	public String openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) String apiDocsUrl, Locale locale)
+	public byte[] openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiJson(request, apiDocsUrl, locale);
 	}
@@ -128,7 +128,7 @@ public String openapiJson(HttpServletRequest request, @Value(API_DOCS_URL) Strin
 	@Operation(hidden = true)
 	@GetMapping(value = DEFAULT_API_DOCS_URL_YAML, produces = APPLICATION_OPENAPI_YAML)
 	@Override
-	public String openapiYaml(HttpServletRequest request, @Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl, Locale locale)
+	public byte[] openapiYaml(HttpServletRequest request, @Value(DEFAULT_API_DOCS_URL_YAML) String apiDocsUrl, Locale locale)
 			throws JsonProcessingException {
 		return super.openapiYaml(request, apiDocsUrl, locale);
 	}
diff --git a/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app136/SpringDocApp136Test.java b/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app136/SpringDocApp136Test.java
@@ -21,6 +21,7 @@
  */
 package test.org.springdoc.api.v30.app136;
 
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
@@ -67,7 +68,8 @@ public void shouldGenerateOperationIdsDeterministically() throws Exception {
 		when(request.getRequestURL()).thenReturn(new StringBuffer("http://localhost"));
 
 		String expected = getContent("results/3.0.1/app136.json");
-		String openApi = resource.openapiJson(request, "", Locale.getDefault());
+		byte[] openApiBytes = resource.openapiJson(request, "", Locale.getDefault());
+		String openApi = new String(openApiBytes, StandardCharsets.UTF_8); // for UTF-8 encoding
 		assertEquals(expected, openApi, true);
 	}
 
diff --git a/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/Example2Controller.java b/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/Example2Controller.java
@@ -0,0 +1,36 @@
+package test.org.springdoc.api.v30.app201;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author bnasslahsen
+ */
+@RestController
+@RequestMapping("/example2")
+public class Example2Controller {
+
+	@ExceptionHandler(Exception.class)
+	@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+	@ApiResponse(responseCode = "500", description = "ExceptionHandler in example2")
+	public String customControllerException() {
+		return "example2";
+	}
+
+	@GetMapping("/500")
+	@Operation(
+			tags = "example2",
+			summary = "Example2 method",
+			description = "This method is an example2"
+	)
+	public void test() {
+		throw new RuntimeException();
+	}
+}
diff --git a/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/SpringDocApp201Test.java b/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/SpringDocApp201Test.java
@@ -0,0 +1,34 @@
+/*
+ *
+ *  *
+ *  *  *
+ *  *  *  * Copyright 2019-2022 the original author or authors.
+ *  *  *  *
+ *  *  *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  *  *  * you may not use this file except in compliance with the License.
+ *  *  *  * You may obtain a copy of the License at
+ *  *  *  *
+ *  *  *  *      https://www.apache.org/licenses/LICENSE-2.0
+ *  *  *  *
+ *  *  *  * Unless required by applicable law or agreed to in writing, software
+ *  *  *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  *  *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  *  *  * See the License for the specific language governing permissions and
+ *  *  *  * limitations under the License.
+ *  *  *
+ *  *
+ *
+ */
+
+package test.org.springdoc.api.v30.app201;
+
+import test.org.springdoc.api.v30.AbstractSpringDocV30Test;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+public class SpringDocApp201Test extends AbstractSpringDocV30Test {
+
+	@SpringBootApplication
+	static class SpringDocTestApp {}
+
+}
diff --git a/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/SpringWebConfig.java b/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/v30/app201/SpringWebConfig.java
@@ -0,0 +1,20 @@
+package test.org.springdoc.api.v30.app201;
+
+import java.util.List;
+
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.StringHttpMessageConverter;
+import org.springframework.stereotype.Component;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+/**
+ * @author bnasslahsen
+ */
+@Component
+public class SpringWebConfig implements WebMvcConfigurer {
+
+	@Override
+	public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
+		converters.removeIf(c -> c instanceof StringHttpMessageConverter);
+	}
+}
diff --git a/springdoc-openapi-webmvc-core/src/test/resources/results/3.0.1/app201.json b/springdoc-openapi-webmvc-core/src/test/resources/results/3.0.1/app201.json
