When getting ExceptionHandler in the controller, use target class in case of AOP Proxy. Fixes springdoc#2098

Author: uc4w6c

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/service/GenericResponseService.java

@@ -3,7 +3,7 @@
  *  *
  *  *  *
  *  *  *  *
- *  *  *  *  * Copyright 2019-2022 the original author or authors.
+ *  *  *  *  * Copyright 2019-2023 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.
@@ -673,7 +673,12 @@ else if (returnType instanceof ParameterizedType) {
 	 */
 	private synchronized Map<String, ApiResponse> getGenericMapResponse(Class<?> beanType) {
 		List<ControllerAdviceInfo> controllerAdviceInfosInThisBean = localExceptionHandlers.stream()
-				.filter(controllerInfo -> beanType.equals(controllerInfo.getControllerAdvice().getClass()))
+				.filter(controllerInfo -> {
+					Class<?> objClz = controllerInfo.getControllerAdvice().getClass();
+					if (org.springframework.aop.support.AopUtils.isAopProxy(controllerInfo.getControllerAdvice()))
+						objClz = org.springframework.aop.support.AopUtils.getTargetClass(controllerInfo.getControllerAdvice());
+					return beanType.equals(objClz);
+				})
 				.collect(Collectors.toList());
 
 		Map<String, ApiResponse> genericApiResponseMap = controllerAdviceInfosInThisBean.stream()

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app202/Example2Controller.java

@@ -0,0 +1,23 @@
+package test.org.springdoc.api.v30.app202;
+
+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;
+
+@RestController
+@RequestMapping("/example2")
+public class Example2Controller {
+	@GetMapping("/")
+	public void index() {
+		throw new IllegalArgumentException();
+	}
+
+	@ExceptionHandler(IllegalArgumentException.class)
+	@ResponseStatus(HttpStatus.BAD_REQUEST)
+	public String customControllerException() {
+		return "example";
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app202/ExampleController.java

@@ -0,0 +1,25 @@
+package test.org.springdoc.api.v30.app202;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+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;
+
+@RestController
+@RequestMapping("/example")
+@Validated
+public class ExampleController {
+	@GetMapping("/")
+	public void index() {
+		throw new IllegalArgumentException();
+	}
+
+	@ExceptionHandler(IllegalArgumentException.class)
+	@ResponseStatus(HttpStatus.NOT_FOUND)
+	public String customControllerException() {
+		return "example";
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app202/MyExceptionHandler.java

@@ -0,0 +1,23 @@
+package test.org.springdoc.api.v30.app202;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.HttpRequestMethodNotSupportedException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ControllerAdvice
+public class MyExceptionHandler {
+	@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+	@ExceptionHandler({ HttpRequestMethodNotSupportedException.class })
+	@ResponseBody
+	public Map<String, Object> handleError() {
+		Map<String, Object> errorMap = new HashMap<String, Object>();
+		errorMap.put("message", "error");
+		return errorMap;
+	}
+}

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app202/SpringDocApp202Test.java

@@ -0,0 +1,34 @@
+/*
+ *
+ *  *
+ *  *  *
+ *  *  *  * Copyright 2019-2023 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.app202;
+
+import test.org.springdoc.api.v30.AbstractSpringDocV30Test;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+public class SpringDocApp202Test extends AbstractSpringDocV30Test {
+
+	@SpringBootApplication
+	static class SpringDocTestApp {}
+
+}

springdoc-openapi-starter-webmvc-api/src/test/resources/results/3.0.1/app202.json

@@ -0,0 +1,88 @@
+{
+  "openapi": "3.0.1",
+  "info": {
+    "title": "OpenAPI definition",
+    "version": "v0"
+  },
+  "servers": [
+    {
+      "url": "http://localhost",
+      "description": "Generated server url"
+    }
+  ],
+  "paths": {
+    "/example2/": {
+      "get": {
+        "tags": [
+          "example-2-controller"
+        ],
+        "operationId": "index",
+        "responses": {
+          "200": {
+            "description": "OK"
+          },
+          "400": {
+            "description": "Bad Request",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "type": "string"
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Internal Server Error",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "type": "object",
+                  "additionalProperties": {
+                    "type": "object"
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/example/": {
+      "get": {
+        "tags": [
+          "example-controller"
+        ],
+        "operationId": "index_1",
+        "responses": {
+          "200": {
+            "description": "OK"
+          },
+          "404": {
+            "description": "Not Found",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "type": "string"
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Internal Server Error",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "type": "object",
+                  "additionalProperties": {
+                    "type": "object"
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components": {}
+}