spring mvc exception 처리

1. http status code를 활용한 방법

    @ResponseStatus(value=HttpStatus.NOT_FOUND, reason="No such Order")  // 404
    public class OrderNotFoundException extends RuntimeException {
        // ...
    }

@RequestMapping(value="/orders/{id}", method=GET)
    public String showOrder(@PathVariable("id") long id, Model model) {
        Order order = orderRepository.findOrderById(id);
        if (order == null) throw new OrderNotFoundException(id);
        model.addAttribute(order);
        return "orderDetail";
    }

2. controller를 기반으로 한 Exception  처리

@Controllerpublic class ExceptionHandlingController {

  // @RequestHandler methods
  ...

  // Exception handling methods

  // Convert a predefined exception to an HTTP Status code
  @ResponseStatus(value=HttpStatus.CONFLICT, reason="Data integrity violation")  // 409
  @ExceptionHandler(DataIntegrityViolationException.class)
  public void conflict() {
    // Nothing to do
  }

  // Specify the name of a specific view that will be used to display the error:
  @ExceptionHandler({SQLException.class,DataAccessException.class})
  public String databaseError() {
    // Nothing to do.  Returns the logical view name of an error page, passed to
    // the view-resolver(s) in usual way.
    // Note that the exception is _not_ available to this view (it is not added to
    // the model) but see "Extending ExceptionHandlerExceptionResolver" below.
    return "databaseError";
  }

  // Total control - setup a model and return the view name yourself. Or consider
  // subclassing ExceptionHandlerExceptionResolver (see below).
  @ExceptionHandler(Exception.class)
  public ModelAndView handleError(HttpServletRequest req, Exception exception) {
    logger.error("Request: " + req.getRequestURL() + " raised " + exception);

    ModelAndView mav = new ModelAndView();
    mav.addObject("exception", exception);
    mav.addObject("url", req.getRequestURL());
    mav.setViewName("error");
    return mav;
  }}

3. 전역 Exception Handling (@ControllerAdvice)

@ControllerAdviceclass GlobalControllerExceptionHandler {
    @ResponseStatus(HttpStatus.CONFLICT)  // 409
    @ExceptionHandler(DataIntegrityViolationException.class)
    public void handleConflict() {
        // Nothing to do
    }}

참고 사이트 :
1. http://spring.io/blog/2013/11/01/exception-handling-in-spring-mvc

2. http://eurobeat.hosting.paran.com/wp/index.php/2014/03/exception-handling-for-rest-with-spring-3-2/

cf ) restful 에서 Exception Handling

public class ErrorInfo {
    public final String url;
    public final String ex;

    public ErrorInfo(String url, Exception ex) {
        this.url = url;
        this.ex = ex.getLocalizedMessage();
    }}

@ResponseStatus(HttpStatus.BAD_REQUEST)@ExceptionHandler(MyBadDataException.class)@ResponseBody ErrorInfo handleBadRequest(HttpServletRequest req, Exception ex) {
    return new ErrorInfo(req.getRequestURL(), ex);}