Spring Boot在引发异常时不显示自定义错误

Question

我对Java/Spring领域相当陌生，我正在尝试在我的Spring Boot应用程序中使用@ControllerAdvise。ControllerAdvision捕获异常，但不显示我的自定义响应。

下面是引发异常的RestController的快照

ResponseEntity<MyClass> response = new ResponseEntity<MyClass>(HttpStatus.OK);

    try {   
        response = restTemplate.exchange(url, HttpMethod.GET, entity, MyClass.class);
    } catch (HttpClientErrorException  ex) {        
        throw ex;
    }catch (HttpServerErrorException   ex) {
        logger.debug(ex.getMessage() + " Server Status Code - " + ex.getStatusCode());
    }
    catch(Exception ex) {
        logger.debug(ex.getMessage() + " Generic Exception ");
    }

以下是@ControllerAdvice

@ControllerAdvice
public class GlobalExceptionHandler extends Exception {

    @ExceptionHandler(HttpClientErrorException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public ErrorResponse errorHandle(HttpClientErrorException ex) {

          String responseBody = ex.getResponseBodyAsString(); 

          ObjectMapper mapper = new ObjectMapper();
          mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
          ErrorResponse errorResponse = new ErrorResponse();
          try { 
              errorResponse = mapper.readValue(responseBody, ErrorResponse.class); 

          } catch (JsonMappingException e) { 
          e.printStackTrace(); 
          } catch (JsonProcessingException e) { 
              e.printStackTrace(); 
          }
        return errorResponse;
    }
}

@JsonIgnoreProperties
public class ErrorResponse {
    @JsonProperty("error")
    public Error error;

      @JsonProperty("version") 
      public String version;

}

public class Error {
    @JsonProperty("code")
    public String Code;

    @JsonProperty("message")
    public String Message;

    public String getCode() {
        return Code;
    }

    public void setCode(String code) {
        Code = code;
    }

    public String getMessage() {
        return Message;
    }

    public void setMessage(String message) {
        Message = message;
    }

}

{
    "timestamp": "2019-11-20T05:42:24.126+0000",
    "status": 404,
    "error": "Not Found",
    "message": "400 Bad Request",
    "path": "myApi/somecontroller"
}

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Nov 19 23:40:26 CST 2019
There was an unexpected error (type=Not Found, status=404).
400 Bad Request

Answer 1

这不是一个例外，这是一个错误场景

尝试使用以下代码。

@RestController
public class IndexController implements ErrorController{

    private static final String PATH = "/error";

    @RequestMapping(value = PATH)
    public String error() {
        return "Error handling";
    }

    @Override
    public String getErrorPath() {
        return PATH;
    }
}

需要重写的Spring Boot默认寄存器BasicErrorController