Question

我在Spring Boot 1.5.3中使用@ControllerAdvice注释的ExceptionHandler有一个奇怪的情况。它捕获任何异常默认异常，但如果我抛出自定义异常，它不会触发。

ExceptionHandler：

@ControllerAdvice
public class ResponseEntityExceptionHandler {

@ExceptionHandler({ HttpMessageNotReadableException.class })
protected ResponseEntity<ErrorModel> handleInvalidJson(RuntimeException e, WebRequest request) {
    return new ResponseEntity<ErrorModel>(new ErrorModel().message("Could not parse JSON."), HttpStatus.BAD_REQUEST);
}

@ExceptionHandler({ NumberFormatException.class })
protected ResponseEntity<ErrorModel> handleInvalidRequest(RuntimeException e, WebRequest request) {
    return new ResponseEntity<ErrorModel>(new ErrorModel().message("Invalid request parameter."), HttpStatus.BAD_REQUEST);
}

@ExceptionHandler({ CannotCreateTransactionException.class })
protected ResponseEntity<ErrorModel> handleTransactionCreationException(RuntimeException e, WebRequest request) {
    return new ResponseEntity<ErrorModel>(new ErrorModel().message("Error connecting to the database, please make sure it is still available."), HttpStatus.BAD_REQUEST);
}

@ExceptionHandler({ NotFoundException.class })
protected ResponseEntity<ErrorModel> handleApiException(RuntimeException e, WebRequest request) {
    return new ResponseEntity<ErrorModel>(new ErrorModel().message(e.getMessage()), HttpStatus.NOT_FOUND);
}
}

前三个异常都被捕获并按原样处理，但是底层的异常由默认的Spring-Boot ExceptionHandler处理。这是我在Controller中抛出的自定义异常：

public ResponseEntity<?> deleteActor(@ApiParam(value = "Used to identify a single actor.", required = true) @PathVariable("actor_id") Integer actorId, @RequestHeader("Accept") String accept) throws Exception {
Actor actor = actorRepository.findOne(actorId);
if (actor == null) {
    throw new NotFoundException(404, "Not found");
}
actorRepository.delete(actorId);
return new ResponseEntity<Void>(HttpStatus.NO_CONTENT);
}

我试过抛出这样的顶级例外之一：

public ResponseEntity<?> readActor(@ApiParam(value = "Used to identify a single actor.", required = true) @PathVariable("actor_id") Integer actorId, @RequestHeader("Accept") String accept) throws Exception {
    Actor actor = actorRepository.findOne(actorId);
    if (actor == null) {
        throw new NumberFormatException("");
    }
    return new ResponseEntity<Actor>(actor, HttpStatus.OK);
}

这些处理得很好......

tomcat日志也显示了这个：

2017-06-05 11:30:20.080  INFO 9076 --- [           main] .m.m.a.ExceptionHandlerExceptionResolver : Detected @ExceptionHandler methods in responseEntityExceptionHandler

例外：

public class NotFoundException extends ApiException {
private int code;
public NotFoundException (int code, String msg) {
    super(code, msg);
    this.code = code;
}
}

异常继承自此基类：

public class ApiException extends Exception{
private int code;
public ApiException (int code, String msg) {
    super(msg);
    this.code = code;
}
}

有关自定义Exception为何避免ExceptionHandler检测的任何想法？

如果有必要，我很乐意提供更多信息。

Answer 1

对于这种特殊情况，答案是使用Exception而不是RuntimeException，因为NotFoundException只从Exception继承。

进一步值得注意的事情：

要捕获所有例外，可以使用@ExceptionHandler(Exception.class)
如果对例外使用通用名称，请务必检查是否已导入正确的名称。

Spring Boot @ControllerAdvice部分工作，不适用于自定义异常

1 个答案: