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copied!<p>This is class loader memory leak. Each time you redeploy the application, a new classloader is created for it and all classes of your application are loaded again. This consumes memory in the perm gen space.</p> <p>The old classloader and all its loaded classes have to be garbage collected, otherwise you will eventually run into a PermGen space OOME after deploying multiple times. This does not work if an object loaded by an outside classloader holds a reference to any object loaded by the old classloader. <a href="http://blogs.oracle.com/fkieviet/entry/classloader_leaks_the_dreaded_java" rel="noreferrer">This article</a> gives a good explanation of the problem.</p> <p>Generally, classloader leaks are difficult to analyze and sometimes difficult to fix. To find out why the old classloaders are not garbage collected, you have to use a profiler. In <a href="http://www.ej-technologies.com/products/jprofiler/overview.html" rel="noreferrer">JProfiler</a>, use the heap walker, select the glassfish classloader objects and use the incoming references view to check for paths to garbage collector roots.</p> <p>The class loader class is called <code>org.apache.servlet.jasper.JasperLoader</code>. Here's a screenshot of a regular situation, where the class loader is only held by live instances of loaded objects.</p> <p><img src="https://i.stack.imgur.com/B6u2Q.png" alt="enter image description here"></p> <p>In your situation, you should see references from outside objects. Another common cause of a classloader leak in web containers is a background thread that is not stopped. Google Guice for example has such a bug in 3.0.</p> <p>(Disclaimer: my company develops JProfiler)</p>

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