This wiki is now officially out of date and all content has been moved to the Jetty Documentation Hub Direct Link to updated documentation: But, if you've thoroughly investigated using tools like jconsole, yourkit, jprofiler, jvisualvm or any of the other profiling and analysis tools out there and you can eliminate your code as the source of the problem, read on.
This feature is available as of jetty This generally falls into 2 categories: For the dating site leak jit symptoms, a static field is initialized with the value of the classloader, which happens to be a webapp classloader; as the webapp is undeployed and redeployed, the static reference lives on, meaning that the webapp classloader cannot be garbage collected.
The latter case is where a thread is started as a daemon thread and is outside the lifecycle of the webapp; threads have references to the context classloader that created them, thus leading to a memory leak if that classloader belongs to a webapp.
There's here good discussion of the issue here: Note that as some of the problematic code creates threads, you should in general be selective about which preventers you enable, and only use those that are specific to your application. AppContext can be invoked in many different places by the jre.
Toolkit class has a static field that is the default toolkit. Creating the default toolkit causes the creation of an EventQueue, which has a classloader field initialized with the thread context class loader. Note that the bug report at  specifically mentions that a heap dump may not identify the GCRoot as the uncollected loader, making it difficult to identify the cause of the leak.
DriverManager keeps a static reference to the classloader, see java. A known caller of this method is the RMI impl. Java2DLeakPreventer sun.
Disposer keeps a reference to the classloader. LdapPoolManager class is loaded and the system property com. LoginConfigurationLeakPreventer The javax.
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Configuration class keeps a static reference to the thread context classloader. SecurityProviderLeakPreventer Some security providers, such as sun.
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SunPKCS11 start a deamon thread which will trap the thread context classloader. How to Configure Each preventer can be individually enabled by adding an instance to a Server with the addBean Object call. Here's an example of how to do it in code with the org. Note however, if you have more than one Server dating site leak jit symptoms in your jvm, only configure these preventers on one of them. Here's the example from code put into in xml: This was originally developed under the Apache Tomcat project, but over time has been forked by many different projects.
With the advent of JSP 2.
JVM Primer Part 2 - Debugging memory issues; dating site leak jit symptoms
All forks of Jasper suffer from a problem whereby the permgen space can be put under pressure by using jsp tag files. This is because of the classloading architecture of the jsp implementation. Each jsp file is effectively compiled and its class loaded in its own classloader so as to allow for hot replacement.
Each jsp that contains references to a tag file will compile the tag if necessary and then load it using its own classloader. If you have many jsps that refer to the same tag file, then the tag's class will be loaded over and over again into permgen space, once for each jsp.
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The relevant Glassfish bug report is bugand the equivalent Apache Tomcat bug report is bug When the fix becomes available, the Jetty dating site leak jit symptoms will pick it up and incorporate into our release program. Sun bug number describes how this can happen in the scenario when the garbage collector needs to allocate a bit more space during its run and tries to resize the heap but fails because the machine is out of swap space.
One suggested work around is to ensure that the jvm never tries to resize the heap, by setting min heap size to.