Springboot异常处理程序没有捕获异常

Question

在 Spring Boot 和 Rest 应用程序中，我配置了一个异常处理程序，如下所示。如果在请求使其停止服务后抛出异常，它可以正常工作。

Rest api 需要“application/json”的内容类型，如果我不将该内容类型标头发送到 api，异常处理程序不会捕获异常。它在日志中打印以下信息：

DEBUG [o.s.w.s.DispatcherServlet] DispatcherServlet with name 'dispatcherServlet' processing PUT request for [/app/v1.0/customers/customer/zones/zoneName.]
DEBUG [o.s.w.s.m.m.a.RequestMappingHandlerMapping] Looking up handler method for path /app/v1.0/customers/customer/zones/zoneName.
DEBUG [o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver] Resolving exception from handler [null]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'text/plain' not supported
DEBUG [o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver] Invoking @ExceptionHandler method: public final org.springframework.http.ResponseEntity<java.lang.Object> org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest)
DEBUG [o.s.w.s.DispatcherServlet] Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
DEBUG [o.s.w.s.DispatcherServlet] Successfully completed request

这是异常处理程序类：

@ControllerAdvice
@RestController  
public class ServiceExceptionHandler extends ResponseEntityExceptionHandler
{

    @ExceptionHandler(Exception.class)  
    public final ResponseEntity<java.lang.Object> handleException(Throwable ex,WebRequest req)
    {
        ErrorResponse errorResponse = null;
        if (ex instanceof ApiException)
        {
            errorResponse = new ErrorResponse((ApiException) ex);
        }
        else
        {
            logger.error(ex);
            errorResponse = new ErrorResponse();
            errorResponse.setCode(HttpCodes.HTTP_CODE_500);
            errorResponse.setError(ex.getMessage());
        }
        return new ResponseEntity<Object>(errorResponse,
                HttpStatus.valueOf(errorResponse.getCode()));

    }
    protected ResponseEntity<Object> handleNoHandlerFoundException(NoHandlerFoundException ex,
            HttpHeaders headers, HttpStatus status, WebRequest request)
    {
        Map<String, String> responseBody = new HashMap<String, String>();
        responseBody.put("path", request.getContextPath());
        responseBody.put("message",
                "The URL you have reached is not in service at this time (404).");
        return new ResponseEntity<Object>(responseBody, HttpStatus.NOT_FOUND);
    }
}

Answer 1

您的类只会捕获控制器内引发的错误。您看到的错误发生在调用控制器之前，因为 Spring 找不到控制器来处理请求。

DEBUG [o.s.w.s.m.m.a.RequestMappingHandlerMapping] Looking up handler method for path /app/v1.0/customers/customer/zones/zoneName.
DEBUG [o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver] Resolving exception from handler [null]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'text/plain' not supported

请注意，处理程序为空。

您还需要实现一个HandlerExceptionResolver来处理该类型的异常：http://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/mvc.html#mvc-exceptionhandlers

有关更多详细信息，请参阅控制器外部的 Spring 异常处理程序。