[jboss-user] [Beginners Corner] - Re: PermGen space

PeterJ do-not-reply at jboss.com
Mon Sep 29 13:52:59 EDT 2008

In a typical application, the permgen will grow to a certain size and then stay at that size for the rest of the app run. Some of the reasons that the pergen size will increase are:

* Deploying a new application
* Redeploying an application
* Accessing new functionality within an application

If you find that you are redeploying applications often, then you will need to periodically restart the app server.

The JVM will remove unneeded class definitions from the permgen during a garbage collection, but sometimes classes in an old version of an application still hang around even after a new version has been deployed, hence the increase in permgen size.

If you are not redeploying applications, then you need to monitor the permgen size (use JConsole or a similar tool) and when you see a permgen increase you need to figure out what was going on at that time.

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