Uploading file GWT using servlet

Question

I am developing an application with GWT and I'm trying to upload files to the server (or to a directory). I am using a form to submit the chosen file with the FileUpload widget. I have a problem with the servlet that I'm using to upload the files:

package com.asso.server;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;

/**
 * servlet to handle file upload requests
 * 
 * @author hturksoy
 * 
 */
public class FileUploadServlet extends HttpServlet {

        private static final String UPLOAD_DIRECTORY = "c:\\uploaded\\";
        private static final String DEFAULT_TEMP_DIR = ".";

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                        throws ServletException, IOException {
                // TODO Auto-generated method stub
                super.doGet(req, resp);
        }

        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                        throws ServletException, IOException {

                // process only multipart requests
                if (ServletFileUpload.isMultipartContent(req)) {

                        File tempDir = getTempDir();
                        if (!tempDir.exists()) {
                                tempDir.mkdirs();
                        }

                        // Create a factory for disk-based file items
                        FileItemFactory factory = new DiskFileItemFactory();

                        // Create a new file upload handler
                        ServletFileUpload upload = new ServletFileUpload(factory);

                        // Parse the request
                        try {
                                List<FileItem> items = upload.parseRequest(req);
                                for (FileItem fileItem : items) {
                                        // process only file upload
                                        if (fileItem.isFormField()) continue;

                                        String fileName = fileItem.getName();
                                        // get only the file name not whole path
                                        if (fileName != null) {
                                        fileName = FilenameUtils. getName(fileName);
                                    }

                                        File uploadedFile = new File(UPLOAD_DIRECTORY, fileName);
                                        if (uploadedFile.createNewFile()) {
                                                fileItem.write(uploadedFile);
                                                resp.setStatus(HttpServletResponse.SC_CREATED);
                                                resp.getWriter().print("The file was created successfully.");
                                                resp.flushBuffer();
                                        } else
                                                throw new IOException("The file already exists in repository.");
                                }
                        } catch (Exception e) {
                                resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                                "An error occurred while creating the file : " + e.getMessage());
                        }

                } else {
                        resp.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE,
                                                        "Request contents type is not supported by the servlet.");
                }
        }

        private File getTempDir() {
                return new File(DEFAULT_TEMP_DIR);
        }

}

I get this error :

java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
    at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:428)
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:61)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerServersFilter.doFilter(DevAppServerServersFilter.java:106)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:421)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:214)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 41 more

I saw this subject and it says that I should add the commons-fileupload-1.3.jar and commons-io-2.4.jar and I have already done it. How to solve this java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream? Any solution? EDIT: After adding the JARs Directly to my WEB-INF/lib I got this error

java.lang.NoClassDefFoundError: `java.io.FileOutputStream is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
    at org.apache.commons.io.output.DeferredFileOutputStream.thresholdReached(DeferredFileOutputStream.java:178)
    at org.apache.commons.io.output.ThresholdingOutputStream.checkThreshold(ThresholdingOutputStream.java:224)
    at org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:128)
    at org.apache.commons.fileupload.util.Streams.copy(Streams.java:108)
    at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
    at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
    at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
    at com.asso.server.FileUploadServlet.doPost(FileUploadServlet.java:56)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:61)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerServersFilter.doFilter(DevAppServerServersFilter.java:106)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:421)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)`

Did you restart the server? (close down dev mode and relaunch not the restart button) — David, Apr 17 '13 at 19:28
Are you using maven or did you copy the apache jars into WEB-INF/lib? IS the error in Dev mode or Prod mode? — appbootup, Apr 18 '13 at 03:24

score 0 · Answer 1 · edited May 23 '17 at 11:57

0

Ensure you have not missed copying the files commons-fileupload-1.3.jar and commons-io-2.4.jar into your WEB-INF/lib. You also should check your launch classpath for devmode.

Example - I have added a sample jar into my lib and can see the same via my launch configuration.

Update - If you are using GAE please read through

enter image description here

edited May 23 '17 at 11:57

Community

1
1

answered Apr 18 '13 at 03:36

appbootup

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I did not copy them to WEB-INF/lib, I have added them as External JARs. But I have them in my Build Path and classpath – Hassen Ch. Apr 18 '13 at 10:08
Avoid posting updates as answers!!! Since you are trying to use google app engine your query might be answered by http://stackoverflow.com/questions/1513603/how-to-upload-and-store-an-image-with-google-app-engine-java – appbootup Apr 18 '13 at 14:32
1

I did not update to answer I updated because the problem was not solved yet and there was an other problem. You can check the answer below where the problem is solved but there is an other error Thank you for your help! – Hassen Ch. Apr 18 '13 at 14:50

Eyal Liebermann · Answer 2 · 2013-08-11T05:34:52.730

A Google App Engine application cannot write to the filesystem.

The DiskFileItemFactory object you use tries to write to the filesystem and therefore you get the following exception:

java.lang.NoClassDefFoundError: `java.io.FileOutputStream is a restricted class. Please see the Google  App Engine developer's guide for more details.

Here's the explanation from DiskFileItemFactory documentation:

This implementation creates FileItem instances which keep their content either in memory, for smaller items, or in a temporary file on disk, for larger items. The size threshold, above which content will be stored on disk, is configurable, as is the directory in which temporary files will be created. If not otherwise configured, the default configuration values are as follows: Size threshold is 10KB.

The solution: You should increase the file size threshold. Override the default. Set it to the largest file size you would like to upload to your servlet.

DiskFileItemFactory factory= new DiskFileItemFactory(5000000,null);

or

DiskFileItemFactory factory= new DiskFileItemFactory();
factory.setSizeThreshold(5000000);

Uploading file GWT using servlet

2 Answers2