How to handle MaxUploadSizeExceededException
This is an old question so I'm adding it for the future people (including future me) who are struggling to get this working with Spring Boot 2.
At first you need to configure the spring application (in properties file):
spring.servlet.multipart.max-file-size=10MBspring.servlet.multipart.max-request-size=10MBIf you're using embedded Tomcat (and most likely you are, as it comes as standard) it's also important to configure Tomcat not to cancel the request with large body
server.tomcat.max-swallow-size=-1or at least set it to relatively big size
server.tomcat.max-swallow-size=100MBIf you will not set maxSwallowSize for Tomcat, you might waste lots of hours debugging why the error is handled but browser gets no response - that's because without this configuration Tomcat will cancel the request, and even though you'll see in the logs that application is handling the error, the browser already received cancellation of request from Tomcat and isn't listening for the response anymore.
And to handle the MaxUploadSizeExceededException you can add ControllerAdvice with ExceptionHandler.
Here's a quick example in Kotlin that simply sets a flash attribute with an error and redirects to some page:
@ControllerAdviceclass FileSizeExceptionAdvice { @ExceptionHandler(MaxUploadSizeExceededException::class) fun handleFileSizeException( e: MaxUploadSizeExceededException, redirectAttributes: RedirectAttributes ): String { redirectAttributes.addFlashAttribute("error", "File is too big") return "redirect:/" }}NOTE: if you want to handle MaxUploadSizeExceededException with ExceptionHandler directly in your controller class, you should configure following property:
spring.servlet.multipart.resolve-lazily=trueotherwise that exception will be triggered before the request is mapped to controller.
I finally figured out a solution that works using a HandlerExceptionResolver.
Add multipart resolver to your Spring config:
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- the maximum size of an uploaded file in bytes --> <!-- <property name="maxUploadSize" value="10000000"/> --> <property name="maxUploadSize" value="1000"/></bean> Model - UploadedFile.java:
package com.mypkg.models;import org.springframework.web.multipart.commons.CommonsMultipartFile;public class UploadedFile{ private String title; private CommonsMultipartFile fileData; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public CommonsMultipartFile getFileData() { return fileData; } public void setFileData(CommonsMultipartFile fileData) { this.fileData = fileData; }}View - /upload.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html> <head> <title>Test File Upload</title> </head> <body> <h1>Select a file to upload</h1> <c:if test="${not empty errors}"> <h2 style="color:red;">${errors}.</h2> </c:if> <form:form modelAttribute="uploadedFile" method="post" enctype="multipart/form-data" name="uploadedFileform" id="uploadedFileform"> <table width="600" border="0" align="left" cellpadding="0" cellspacing="0" id="pdf_upload_form"> <tr> <td width="180"><label class="title">Title:</label></td> <td width="420"><form:input id="title" path="title" cssClass="areaInput" size="30" maxlength="128"/></td> </tr> <tr> <td width="180"><label class="title">File:</label></td> <td width="420"><form:input id="fileData" path="fileData" type="file" /></td> </tr> <tr> <td width="180"></td> <td width="420"><input type="submit" value="Upload File" /></td> </tr> </table> </form:form> </body></html>Controller - FileUploadController.java: package com.mypkg.controllers;
import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.validation.BindingResult;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.multipart.MaxUploadSizeExceededException;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.ModelAndView;import com.mypkg.models.UploadedFile;@Controllerpublic class FileUploadController implements HandlerExceptionResolver{ @RequestMapping(value = "/upload", method = RequestMethod.GET) public String getUploadForm(Model model) { model.addAttribute("uploadedFile", new UploadedFile()); return "/upload"; } @RequestMapping(value = "/upload", method = RequestMethod.POST) public String create(UploadedFile uploadedFile, BindingResult result) { // Do something with the file System.out.println("######### File Uploaded with Title: " + uploadedFile.getTitle()); System.out.println("######### Creating local file: /var/test-file-upload/" + uploadedFile.getFileData().getOriginalFilename()); try { InputStream in = uploadedFile.getFileData().getInputStream(); FileOutputStream f = new FileOutputStream( "/var/test-file-upload/" + uploadedFile.getFileData().getOriginalFilename()); int ch = 0; while ((ch = in.read()) != -1) { f.write(ch); } f.flush(); f.close(); } catch (IOException e) { e.printStackTrace(); } return "redirect:/"; } /*** Trap Exceptions during the upload and show errors back in view form ***/ public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception) { Map<String, Object> model = new HashMap<String, Object>(); if (exception instanceof MaxUploadSizeExceededException) { model.put("errors", exception.getMessage()); } else { model.put("errors", "Unexpected error: " + exception.getMessage()); } model.put("uploadedFile", new UploadedFile()); return new ModelAndView("/upload", model); }}========================================================================
Thanks for solving this Steve. I banged around trying to solve for several hours.
The key is to have the controller implement HandlerExceptionResolver and add the resolveException method.
--Bob