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，我在其中创建了自定义异常处理。有趣的是，当我编译这个项目时，它给了我一个错误。

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);
    }

}

当我评论“handleUserNotFoundException”函数时，它工作正常，但是当我添加此方法时，它给了我这个错误。为什么Spring不能处理它呢？任何帮助将不胜感激。

我删除了函数“handleUserNotFoundException”，它工作正常。此外，当我删除 ExceptionHandler 注释并编译时，它工作正常。

Answer 1

错误消息是有意义的，它说模糊@ExceptionHandler方法，因为您有两个方法映射到同一个异常，即Exception.class

处理所有用户异常

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

处理用户未找到异常

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

这两种方法都被映射，Exception.class对于容器线程在运行时选择来说是模糊的，将handleUserNotFoundException方法映射更改为UnknownException

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