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    <p>After some research this is a little more complicated than it first appears.</p> <p><strong>JSF and multiple files</strong></p> <p>First of all, JSF 2.2 defines <code>&lt;h:inputFile&gt;</code> tag which is limited to a single file, i.e. it does not support HTML5 parameter <code>multiple=true</code>. See <a href="https://stackoverflow.com/questions/16837090/how-can-i-upload-multiple-files-with-jsf-2-2?rq=1">this</a> for more details. On the other hand, it is very easy to extend this tag to allow multiple files since the uploaded files are fetched from the <code>request</code>, so they are easily available. </p> <p><strong>Where are the files parsed and persisted?</strong></p> <p>All JSF requests are handled by the <code>FacesServlet</code>, which is annotated with Servlet's 3.1 tag <code>@MultipartConfig</code>. This annotation basically does all the heavy lifting of extracting and writing the uploaded files. See <a href="http://docs.oracle.com/javaee/7/tutorial/doc/servlets011.htm" rel="nofollow noreferrer">this</a> and <a href="https://stackoverflow.com/questions/3337056/convenient-way-to-parse-incoming-multipart-form-data-parameters-in-a-servlet">this</a>.</p> <p>Although this is very handy and takes care of most things, it doesn't have a progress listener interface, which means that you will get the files (<code>Parts</code>) when they are fully uploaded. I don't see a way to actually intercept this is a clean way in order to implement a server-side progress bar. </p> <p><strong>Server-side Vs Client-side progress listener</strong></p> <p>In order to implement a server side progress listener, you will need somehow to handle files yourself and notify the user about the progress using <code>polling</code> or <a href="http://docs.oracle.com/javaee/7/tutorial/doc/websocket.htm" rel="nofollow noreferrer">WebSockets</a>.</p> <p>For the client-side, you will need to either write a custom <code>POST</code> function like <a href="https://stackoverflow.com/questions/15410265/file-upload-progress-bar-with-jquery">this</a> or use a library like this <a href="http://blueimp.github.io/jQuery-File-Upload/" rel="nofollow noreferrer">this</a> to handle the <code>POST</code> as most browsers don't provide progress information. Basically, instead of using the browsers functionality to do a post (AFAIK) you handle the request yourself and hence you have control of the bytes transferred. The problem here is that <code>FacesServlet</code> expects a request which is formatted by the <code>jsf.js</code> functions and I do not see an easy way to intercept the <code>JS</code> request just for processing file upload.</p> <p><strong>What are my options then?</strong></p> <p>I would safely suggest using an existing library that offers this functionality. If you have the time and still want to DIY, I think that the best way to go is to write your own <code>FileUploadServlet</code> that 'understands' <a href="http://en.wikipedia.org/wiki/JSON" rel="nofollow noreferrer">JSON</a> or <a href="http://en.wikipedia.org/wiki/XMLHttpRequest" rel="nofollow noreferrer">XHR</a> and use a <code>JQuery</code> plugin to initiate the upload and provide the client-side progress bar. </p> <p><strong>Example</strong></p> <p>I have finally decided to go with <a href="http://blueimp.github.io/jQuery-File-Upload/" rel="nofollow noreferrer">JQuery/blueimp fileupload</a>. See <strong><a href="https://stackoverflow.com/questions/20456243/how-can-i-define-a-jax-rs-service-that-processes-multi-part-data-in-jee">this comment</a></strong> for details. Note, that this is not actually part of the normal JSF Flow, I developed a custom way for feeding the actual parts in my application.</p> <p>PS. As I am new to this, don't read this answer as a definitive answer but as a starting point for your own research.</p>
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