Spring exception handler , can't access request attributes

manpreet Best Answer 2 years ago

I have this controller using spring boot 2.1

@Controller
@AllArgsConstructor
@ControllerAdvice
public class AdminPoolsController {

@PostMapping("admin/pools/edit")
    public String update(@Valid final PoolDto pool,
                         @RequestParam(name = "image-upload", required = false) final MultipartFile file,
                         final BindingResult bindingResult,
                         final RedirectAttributes redirectAttrs) throws IOException {
        //some logic
    }


    @ExceptionHandler(MaxUploadSizeExceededException.class)
    public String fileSizeLimitExc(
            final HttpServletRequest request,
            final RedirectAttributes redirectAttributes,
            final MaxUploadSizeExceededException exc
    ) {
        final Object id = request.getAttribute("id");
        redirectAttributes.addFlashAttribute(
                "errors",
                ImmutableMap.of(
                        "logo",
                        String.format(
                                "File exceeded max size of %d bytes",
                                exc.getMaxUploadSize()
                        )
                )
        );
        return "redirect:/admin/pools/edit" + (id == null ? "" : "?id=" + id.toString());
    }

}

As you see I have PoolDto in POST method , this DTO has id , binding happen through html form

<input type="hidden" name="id" id="id" th:value="${pool.id}">

In html form I can provide file using input type file , but this file is limited in size therefore I catch MaxUploadSizeExceededException My problem is , HttpServletRequest inside error handling method doesn't have any request attributes , in my case I want to get id from original request , but it is always null. How can I catch original request attributes using ExceptionHandler ?