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    <p>This can have a lot of possible causes (also see the comments I posted).</p> <ul> <li>External JS is not loaded.</li> <li>JS code is syntactically/logically invalid.</li> <li>Request URL is invalid.</li> <li>Servlet is not mapped at all.</li> <li>Servlet is mapped on wrong <code>url-pattern</code>.</li> <li>Servlet failed to start/init.</li> </ul> <p>It's hard to naildown the root cause based on the as far given information.</p> <p>As you mentioned that you didn't see any request been fired in the "Net" tab of FireBug, I think that the JS code is simply syntactically/logically invalid. Rightclick page and doubleverify generated/printed JS code.</p> <p><strong>Update:</strong> I tried to reproduce your problem.</p> <ol> <li><p>I downloaded <a href="http://www.uploadify.com/_files/jquery.uploadify-v2.1.0.zip" rel="noreferrer">jquery.uploadify-v2.1.0 (MIT)</a>, extracted it and put the entire contents in the <code>/WebContent/uploadify</code> folder of my (empty) playground web project in Eclipse.</p></li> <li><p>I created a <code>/WebContent/upload.jsp</code> file as follows:</p> <pre class="lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt; &lt;html lang="en"&gt; &lt;head&gt; &lt;title&gt;Uploadify test&lt;/title&gt; &lt;script src="uploadify/jquery-1.3.2.min.js"&gt;&lt;/script&gt; &lt;script src="uploadify/swfobject.js"&gt;&lt;/script&gt; &lt;script src="uploadify/jquery.uploadify.v2.1.0.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function() { $('#uploadify').uploadify({ 'uploader': 'uploadify/uploadify.swf', 'script': 'uploadServlet', 'folder': '/uploads', 'cancelImg': 'uploadify/cancel.png' }); $('#upload').click(function() { $('#uploadify').uploadifyUpload(); return false; }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;input id="uploadify" type="file"&gt; &lt;a id="upload" href="#"&gt;Upload&lt;/a&gt; &lt;/body&gt; &lt;/html&gt; </code></pre></li> <li><p>I created a <code>com.example.UploadServlet</code> as follows with little help of <a href="http://commons.apache.org/fileupload" rel="noreferrer">Apache Commons FileUpload</a> (just placed <a href="http://mirrors.kahuki.com/apache/commons/fileupload/binaries/commons-fileupload-1.2.1-bin.zip" rel="noreferrer"><code>commons-fileupload-1.2.1.jar</code></a> and <a href="http://www.alliedquotes.com/mirrors/apache/commons/io/binaries/commons-io-1.4-bin.zip" rel="noreferrer"><code>commons-io-1.4.jar</code></a> in <code>/WEB-INF/lib</code>):</p> <pre class="lang-java prettyprint-override"><code>package com.example; 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.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class UploadServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("UploadServlet invoked. Here are all uploaded files: "); try { List&lt;FileItem&gt; items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request); for (FileItem item : items) { if (!item.isFormField()) { System.out.println("Name: " + item.getName()); System.out.println("Size: " + item.getSize()); System.out.println("Type: " + item.getContentType()); } } } catch (Exception e) { throw new ServletException(e); } } } </code></pre></li> <li><p>I registered <code>com.example.UploadServlet</code> in <code>web.xml</code> as follows:</p> <pre class="lang-xml prettyprint-override"><code>&lt;servlet&gt; &lt;servlet-name&gt;uploadServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;com.example.UploadServlet&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;uploadServlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/uploadServlet&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre></li> <li><p>I deployed the project, started the server, went to <a href="http://localhost:8080/playground/upload.jsp" rel="noreferrer">http://localhost:8080/playground/upload.jsp</a>, selected a random big file from my downloads folder, clicked the <code>Upload</code> link, see the upload percentage counter growing to 100% and I finally see the following in the stdout:</p> <pre> UploadServlet invoked. Here are all uploaded files: Name: glassfish-v3-windows.exe Size: 50402555 Type: application/octet-stream </pre></li> </ol> <p>I'm sorry to say, I can't reproduce your problem. At least, the above information should help you to get started "freshly". Hope it helps.</p> <p><strong>Update:</strong> as per the comments, the filter expects that it is using the same session. Ok, you can do this fairly easy by changing</p> <pre><code>'&lt;%= request.getContextPath() %&gt;/uploadFile?portletId=${portletId}&amp;remoteFolder=&lt;%= decodedString %&gt;',"; </code></pre> <p>to</p> <pre><code>'&lt;%= request.getContextPath() %&gt;/uploadFile;jsessionid=${pageContext.session.id}?portletId=${portletId}&amp;remoteFolder=&lt;%= decodedString %&gt;',"; </code></pre>
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    1. COSeems,that 'script' param is really taken into consideration,because if it refers to non-existing servlet, that HTTP Error message is appeared on UI.Actually, i couldn't find this message in plugin sources.See,please, screen in bottom of the post.
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    2. COOkay. *How* did you conclude that the servlet isn't triggered? You literally stated like that in your question. Have you for instance debugged the `doPost()` method? Even the poor man's way with a `System.out.println("Hey, uploadservlet doPost() is invoked!");`? Have you for instance read **all** server logs in the `/logs` folder?
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    3. COI just discovered,with help of sniffer,that there is no POST request at all on click for uploading file,i.e. Servlet isn't triggered. Seems, that problem really in Flash config,so in JS as you said.
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