创建类路径资源中定义的名为“handlerExceptionResolver”的bean时出错

Question

我有一个简单的项目，在这里我创建了自定义异常处理。有趣的是，当我编译这个项目时，它会给我一个错误。

Error creating bean with name 'handlerExceptionResolver' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerExceptionResolver]: Factory method 'handlerExceptionResolver' threw exception; nested exception is java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class java.lang.Exception]: {public final org.springframework.http.ResponseEntity com.winwinit.rest.microservices.restfulwebservices.Exception.CustomizedEntityExceptionResponse.handleAllUserException(java.lang.Exception,org.springframework.web.context.request.WebRequest), public final org.springframework.http.ResponseEntity com.winwinit.rest.microservices.restfulwebservices.Exception.CustomizedEntityExceptionResponse.handleAllException(java.lang.Exception,org.springframework.web.context.request.WebRequest)}
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]

package com.winwinit.rest.microservices.restfulwebservices.Exception;

import java.util.Date;

import org.omg.CORBA.portable.UnknownException;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;


import com.winwinit.rest.microservices.restfulwebservices.User.UserNotFoundException;

@ControllerAdvice
@RestController
public class CustomizedEntityExceptionResponse extends 
    ResponseEntityExceptionHandler{

    @ExceptionHandler(Exception.class)
    public final ResponseEntity<Object> handleAllException(Exception ex, WebRequest request)  {
        ExceptionResponse exceptionResponse = new ExceptionResponse(new Date(), ex.getMessage(), request.getDescription(false));    
        return new ResponseEntity(exceptionResponse, HttpStatus.INTERNAL_SERVER_ERROR);
    }


    @ExceptionHandler(Exception.class)
    public final ResponseEntity<Object> handleAllUserException(Exception ex, WebRequest request)  {
        exceptionResponse exceptionResponse = new ExceptionResponse(new Date(), ex.getMessage(), request.getDescription(false));
        return new ResponseEntity(exceptionResponse, HttpStatus.INTERNAL_SERVER_ERROR);
    }


    @ExceptionHandler(Exception.class)
    public final ResponseEntity<Object> handleUserNotFoundException(UnknownException ex, WebRequest request)  {
        ExceptionResponse exceptionResponse = new ExceptionResponse(new Date(), ex.getMessage(), request.getDescription(false));
        return new ResponseEntity(exceptionResponse, HttpStatus.NOT_FOUND);
    }

}

当我注释'handleUserNotFoundException‘函数时，它工作得很好，但是当我添加这个方法时，它会给出这个错误。为什么春不能处理它？任何帮助都将不胜感激。

我删除了函数'handleUserNotFoundException‘，它工作得很好。另外，当我移除ExceptionHandler注释并编译它时，它工作得很好。

Answer 1

错误消息是有意义的，它说是不明确的@ExceptionHandler方法，因为您有两个方法映射到相同的异常，即Exception.class

handleAllUserException

@ExceptionHandler(Exception.class)
public final ResponseEntity<Object> handleAllUserException(Exception ex, WebRequest request)  

handleUserNotFoundException

 @ExceptionHandler(Exception.class)
 public final ResponseEntity<Object> handleUserNotFoundException(UnknownException ex, WebRequest request)  

这两种方法都映射为Exception.class，这对于容器线程在运行时要选择的对象来说是不明确的，因此将handleUserNotFoundException方法映射为UnknownException。

@ExceptionHandler(UnknownException.class)
public final ResponseEntity<Object> handleUserNotFoundException(UnknownException ex, WebRequest request)