@ExceptionHandler@EnableWebMvc，则返回响应实体的 HttpMediaType 不可接受的异常 （406）

Question

我在Spring Boot中有一些REST Web服务（版本1.5.13）

我想使用@ControlllerAdVP来处理控制器引发的异常。

对于下面的 API testA，如果 id=123，@ControllerAdvice类能够捕获并处理异常，但是，如果 id 不等于 123，则我的程序无法将响应实体转换为 JSON，并且抛出“组织.springframework.web.HttpMediaType不可接受的异常：找不到可接受的表示形式 （406）”。

如果我取消对下面的@EnableWebMvc的注释，响应实体能够正确返回JSON结果，但是，@Controlller建议将无法捕获异常。

@RestController("SpocController")
//@EnableWebMvc
@RequestMapping(value = { "/testing" })
public class TestController 
{   
    @GetMapping(value = "/testA", produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody ResponseEntity<Object> testA(@RequestParam String id) throws IOException   
    {       
        if(id.equals("123"))
        {
            throw new IOException("customized exception");
        }

        Map<String,Object> body = new HashMap<String, Object>();
        body.put("hello", "hihi");

        return new ResponseEntity<Object>(body, HttpStatus.OK);     
    }

    @GetMapping(value = "/testB", produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody String testB(@RequestParam String id) throws IOException 
    {
        if(id.equals("123"))
        {
            throw new IOException("customized exception");
        }

        return "{ \"ok\":\"test ok\" }";
    }
}

对于API testB，由于返回类型为String，因此它能够在JSON中返回字符串，而@ControlllerAdvie也能够捕获和处理异常。

这是我的控制器建议：

@ControllerAdvice
public class TestExceptionHandler
{
    @ResponseBody
    @ExceptionHandler(IOException.class)
    protected ResponseEntity<Object> handleIOException(IOException ex) 
    {   
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("message", ex.getMessage());        

        return new ResponseEntity(map, HttpStatus.INTERNAL_SERVER_ERROR);       
    }   
}

这是我上面提到的HttpMediaTypeNotAcceptableException（406）。

org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:259)
    at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:208)
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
    at org.springframework.web.html" target="_blank">servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

1） 无论我将@EnableWebMvc放在哪里（在@RestController、@ControllerAdvice或其他类中），我的@ExceptionHandler都无法捕获任何异常。知道为什么会这样吗？

2）我想让我的API testA工作，因为我真的想返回一个响应实体类型，并且它引发的异常可以被@ControllerAdvice捕获。欢迎任何建议。

提前谢谢。

Answer 1

1.                     @RestController
                       @RequestMapping(value = { "/testing" })
                       public class ExceptionController {
                            @GetMapping(value = "/testA", produces = MediaType.APPLICATION_JSON_VALUE)
                               public  ResponseEntity<Object> testA(@RequestParam String id) throws IOException   
                               {       
                                   if(id.equals("123"))
                                   {
                                       throw new IOException("customized exception");
                                   }
   
                                   Map<String,Object> body = new HashMap<String, Object>();
                                   body.put("hello", "hihi");
   
                                   return new ResponseEntity<Object>(body, HttpStatus.OK);     
                               }
                            @GetMapping(value = "/testB", produces = MediaType.APPLICATION_JSON_VALUE)
                               public  String testB(@RequestParam String id) throws IOException 
                               {
                                   if(id.equals("123"))
                                   {
                                       throw new IOException("customized exception");
                                   }
   
                                   return "{ \"ok\":\"test ok\" }";
                               }
   
                       }
   
   

   2.更改您的建议控制器-：

                       package com.ad.blog.controller;
   
                       import java.io.IOException;
                       import java.util.Optional;
   
                       import org.springframework.hateoas.VndErrors;
                       import org.springframework.http.HttpStatus;
                       import org.springframework.http.ResponseEntity;
                       import org.springframework.web.bind.annotation.ExceptionHandler;
                       import org.springframework.web.bind.annotation.RequestMapping;
   
                       @org.springframework.web.bind.annotation.ControllerAdvice
                       @RequestMapping(produces = "application/vnd.error+json")
                       public class ControllerAdvice {
                           @ExceptionHandler(IOException.class) public ResponseEntity < VndErrors > notFoundException(final IOException e) {
                               return error(e, HttpStatus.NOT_FOUND, e.getMessage());
                           }
                           private ResponseEntity < VndErrors > error(final Exception exception, final HttpStatus httpStatus, final String logRef) {
                               final String message = Optional.of(exception.getMessage()).orElse(exception.getClass().getSimpleName());
                               return new ResponseEntity < > (new VndErrors(logRef, message), httpStatus);
                           }
                       }
   

                       <dependency>
                                   <groupId>org.springframework.boot</groupId>
                                   <artifactId>spring-boot-starter-hateoas</artifactId>
                               </dependency>
   

           @Configuration
           @EnableWebMvc
           public class WebConfig extends WebMvcConfigurerAdapter {
   
   
           }
   

Answer 2

找到了罪魁祸首，在评论了下面的代码后，一切都像一个魔咒。无论如何，谢谢大家！

public HandlerExceptionResolver handlerExceptionResolver()
{
    return new HandlerExceptionResolver()
    {
        @Override
        public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception)
        {
            return null;
        }
    };
}

Answer 3

使用@RestController，

无需使用@ResponseBody，您可以查看文档以获取更多详细信息。

- 确保您的请求映射工作并记录一些东西。

-尝试为@RestController使用@RestControlllerAdvie