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POresponse.sendRedirect() in Servlet not working correctly after file upload
 

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  1. POresponse.sendRedirect() in Servlet not working correctly after file upload
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    <p>I have a web application with a simple upload function. The idea is to allow user select a file and upon successfully upload, redirect to <code>index.jsp</code>.</p> <p>However, although the file got uploaded, the <code>response.redirect</code> is not working. After a successfully upload, the page doesn't get redirected. It just stays there. The weird thing is that I can see it is processing the <code>index.jsp</code> from the tomcat server log even though it doesn;t get redirected.</p> <pre><code>protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //processRequest(request, response); boolean status=false; if (!ServletFileUpload.isMultipartContent(request)) { throw new IllegalArgumentException("Request is not multipart, please 'multipart/form-data' enctype for your form."); } ServletFileUpload uploadHandler = new ServletFileUpload(new DiskFileItemFactory()); PrintWriter writer = response.getWriter(); response.setContentType("text/plain"); try { List&lt;FileItem&gt; items = uploadHandler.parseRequest(request); for (FileItem item : items) { if (!item.isFormField()) { File file = new File(getServletContext().getRealPath("/WEB-INF/upload"), item.getName()); item.write(file); writer.write("{\"name\":\"" + item.getName() + "\",\"type\":\"" + item.getContentType() + "\",\"size\":\"" + item.getSize() + "\"}"); } } //redirect to index.jsp if successfully redirect(request, response); } catch (FileUploadException e) { throw new RuntimeException(e); } catch (Exception e) { throw new RuntimeException(e); } finally { writer.close(); } } </code></pre> <p>The redirect method:</p> <pre><code>private void redirect(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.getRequestDispatcher("/index.jsp").forward(request, response); } </code></pre> <p>The file upload plugin is from <code>https://aquantum-demo.appspot.com/file-upload</code> I used the front-end and developed the upload event handler using java apache fileupload. Everything works fine except the redirect part.</p> <p>The application.js file which handles the JSON returns:</p> <pre><code>$(function () { // Initialize jQuery File Upload (Extended User Interface Version): $('#file_upload').fileUploadUIX(); // Load existing files: $.getJSON($('#file_upload').fileUploadUIX('option', 'url'), function (files) { var options = $('#file_upload').fileUploadUIX('option'); options.adjustMaxNumberOfFiles(-files.length); $.each(files, function (index, file) { options.buildDownloadRow(file, options) .appendTo(options.downloadTable).fadeIn(); }); }); </code></pre> <p>});</p> <p>Any ideas?</p>
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    1. COThe code looks fine. However, if you uncomment one of the two outcomments right before the `try`, then the redirect will indeed potentially fail (with an `IllegalStateException` in the server logs). Are you really running the code you think you're running?
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    2. COI have managed to trace down the problem. Yes, you are right, the upload handler works fine. The problem is with the front-end js script that is running. After each successful upload, there is a need to return a JSON response, which causes whatever code that are attached thereafter to fail. I have edited the codes above to show the problem. Are there any fix to this?
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