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

bnasslahsen · bnasslahsen · commit 0a1b2003483d · 2023-02-06T14:59:58.000+01:00
diff --git a/springdoc-openapi-starter-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java b/springdoc-openapi-starter-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java
@@ -1232,7 +1232,7 @@ 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())
@@ -1243,7 +1243,7 @@ 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);
 	}
 
 	/**
@@ -1303,7 +1303,7 @@ 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())
@@ -1312,7 +1312,7 @@ 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-starter-webflux-api/src/main/java/org/springdoc/webflux/api/MultipleOpenApiActuatorResource.java b/springdoc-openapi-starter-webflux-api/src/main/java/org/springdoc/webflux/api/MultipleOpenApiActuatorResource.java
@@ -85,7 +85,7 @@ 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 {
@@ -104,7 +104,7 @@ 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-starter-webflux-api/src/main/java/org/springdoc/webflux/api/MultipleOpenApiWebFluxResource.java b/springdoc-openapi-starter-webflux-api/src/main/java/org/springdoc/webflux/api/MultipleOpenApiWebFluxResource.java
@@ -84,7 +84,7 @@ 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);
@@ -102,7 +102,7 @@ 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-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiActuatorResource.java b/springdoc-openapi-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiActuatorResource.java
@@ -110,7 +110,7 @@ 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);
 	}
@@ -126,7 +126,7 @@ 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-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiResource.java b/springdoc-openapi-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiResource.java
@@ -132,7 +132,7 @@ 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);
@@ -148,7 +148,7 @@ 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-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiWebfluxResource.java b/springdoc-openapi-starter-webflux-api/src/main/java/org/springdoc/webflux/api/OpenApiWebfluxResource.java
@@ -114,7 +114,7 @@ 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);
 	}
@@ -131,7 +131,7 @@ 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-starter-webflux-api/src/test/java/test/org/springdoc/api/app81/SpringDocApp81Test.java b/springdoc-openapi-starter-webflux-api/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 +70,8 @@ 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		String openApi = resource.openapiJson(request, "", Locale.US).block();
 		assertEquals(expected, openApi, true);
 	}
 
diff --git a/springdoc-openapi-starter-webflux-ui/src/test/java/test/org/springdoc/ui/app15/SpringDocApp15Test.java b/springdoc-openapi-starter-webflux-ui/src/test/java/test/org/springdoc/ui/app15/SpringDocApp15Test.java
@@ -39,7 +39,7 @@
 
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
-		properties = { "management.endpoints.web.exposure.include:*",
+		properties = { "management.endpoints.web.exposure.include=*",
 				"springdoc.use-management-port=true",
 				"management.server.port=9294",
 				"management.server.base-path=/test",
diff --git a/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiActuatorResource.java b/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/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 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);
 	}
@@ -99,7 +99,7 @@ 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-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiWebMvcResource.java b/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/MultipleOpenApiWebMvcResource.java
@@ -83,7 +83,7 @@ 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);
@@ -101,7 +101,7 @@ 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-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiActuatorResource.java b/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiActuatorResource.java
@@ -122,7 +122,7 @@ 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);
 	}
@@ -138,7 +138,7 @@ 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-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java b/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java
@@ -133,7 +133,7 @@ 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);
@@ -150,7 +150,7 @@ 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-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiWebMvcResource.java b/springdoc-openapi-starter-webmvc-api/src/main/java/org/springdoc/webmvc/api/OpenApiWebMvcResource.java
@@ -112,7 +112,7 @@ 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);
 	}
@@ -129,7 +129,7 @@ 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-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app136/SpringDocApp136Test.java b/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app136/SpringDocApp136Test.java
@@ -23,6 +23,7 @@
  */
 package test.org.springdoc.api.v30.app136;
 
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
@@ -68,7 +69,8 @@ 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);
 		assertEquals(expected, openApi, true);
 	}
 
diff --git a/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app201/Example2Controller.java b/springdoc-openapi-starter-webmvc-api/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-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app201/SpringDocApp201Test.java b/springdoc-openapi-starter-webmvc-api/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-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app201/SpringWebConfig.java b/springdoc-openapi-starter-webmvc-api/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-starter-webmvc-api/src/test/resources/results/3.0.1/app201.json b/springdoc-openapi-starter-webmvc-api/src/test/resources/results/3.0.1/app201.json
@@ -0,0 +1,41 @@
+{
+  "openapi": "3.0.1",
+  "info": {
+    "title": "OpenAPI definition",
+    "version": "v0"
+  },
+  "servers": [
+    {
+      "url": "http://localhost",
+      "description": "Generated server url"
+    }
+  ],
+  "paths": {
+    "/example2/500": {
+      "get": {
+        "tags": [
+          "example2"
+        ],
+        "summary": "Example2 method",
+        "description": "This method is an example2",
+        "operationId": "test",
+        "responses": {
+          "500": {
+            "description": "ExceptionHandler in example2",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "type": "string"
+                }
+              }
+            }
+          },
+          "200": {
+            "description": "OK"
+          }
+        }
+      }
+    }
+  },
+  "components": {}
+}
diff --git a/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/groovy/test/org/springdoc/api/app1/SpringDocApp1Test.java b/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/groovy/test/org/springdoc/api/app1/SpringDocApp1Test.java
diff --git a/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/groovy/test/org/springdoc/api/app9/SpringDocApp9Test.java b/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/groovy/test/org/springdoc/api/app9/SpringDocApp9Test.java
diff --git a/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/resources/results/app1.json b/springdoc-openapi-tests/springdoc-openapi-groovy-tests/src/test/resources/results/app1.json
