Multipart File Upload:Size exceed exception in spring boot return JSON error message

Question

As I have set maximum file upload limit,I am getting

org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 2097152 bytes

error while uploading file.It is giving 500 error to my api,I should I handle this error and return response in JSON format not an errorpage as provided in ErrorController

I want to catch that exception and give JSON response not ErrorPage.

@RequestMapping(value="/save",method=RequestMethod.POST)
    public ResponseDTO<String> save(@ModelAttribute @Valid FileUploadSingleDTO fileUploadSingleDTO,BindingResult bindingResult)throws MaxUploadSizeExceededException
    {
        ResponseDTO<String> result=documentDetailsService.saveDocumentSyn(fileUploadSingleDTO, bindingResult);

        return result;

    }

DTO that accepts document as follows

public class FileUploadSingleDTO {
@NotNull
    private Integer documentName;

    private Integer documentVersion;

    @NotNull
    private MultipartFile file;
}

I want to catch that file size exceed exception..after large file is uploaded.My code works fine when I upload file size less than MaxUploadSize — MasterCode
– MasterCode, Commented Dec 9, 2015 at 11:31
You can also utilize MultipartHttpServletRequest instead of HttpServletRequest. Then to access the uploaded file(s), you only need to use MultipartFile file = request.getFile(request.getFileNames().next());, which you will need to wrap with an IOException. This keeps your DTO skinny. — Sean Perkins
– Sean Perkins, Commented Jan 5, 2016 at 22:02

Srinivas Rampelli · Accepted Answer · 2015-12-30 14:50:33Z

18

+50

As par I know you can handle the multipart file exception by using this.

@ControllerAdvice
public class MyErrorController extends ResponseEntityExceptionHandler {

Logger logger = org.slf4j.LoggerFactory.getLogger(getClass());

@ExceptionHandler(MultipartException.class)
@ResponseBody
String handleFileException(HttpServletRequest request, Throwable ex) {
    //return your json insted this string.
    return "File upload error";
  }
}

edited Dec 30, 2015 at 14:50

answered Dec 30, 2015 at 14:25

Srinivas Rampelli

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2 Comments

Srinivas Rampelli Over a year ago

After digging into source code, I found that CommonsMultipartResolver is handling the FileSizeLimitExceededException exception and throwing throw new MultipartException("Could not parse multipart servlet request", ex); here ex is the FileSizeLimitExceededException, which is actually thrown by commons.fileupload.FileuploadBase class. So you cannot handle the FileSizeLimitExceededException. Use generic implementation file upload errors using MultipartException.

quintin Over a year ago

@RampelliSrinivas it will be very help full if you can explain the comment you wrote above a bit.

theHacker · Accepted Answer · 2015-12-30 10:48:24Z

4

Add a special exception handler into your Controller:

@ExceptionHandler(FileSizeLimitExceededException.class)
public YourReturnType uploadedAFileTooLarge(FileSizeLimitExceededException e) {
    /*...*/
}

(If this does not work, you have to enable exception handling in your configuration. Normally Spring does this by default.)

answered Dec 30, 2015 at 10:48

theHacker

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