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Dealing with “java.lang.OutOfMemoryError: PermGen space” error

Jayden Bell 1819 07 May 2015
Recently I ran into this error in my web application:

java.lang.OutOfMemoryError: PermGen space
It's a typical Hibernate/JPA + IceFaces/JSF application running on Tomcat 6 and JDK 1.6.

Apparently this can occur after redeploying an application a few times.
java java
Updated 07 May 2015
Jayden Bell
Jayden Bell

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1 Answers

Anonymous User
Anonymous User 07 May 2015
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The solution was to add these flags to JVM command line when Tomcat is started:

-XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled
You can do that by shutting down the tomcat service, then going into the Tomcat/bin directory and running tomcat6w.exe. Under the "Java" tab, add the arguments to the "Java Options" box. Click "OK" and then restart the service.

If you get an error the specified service does not exist as an installed service you should run:

tomcat6w //ES//servicename
where servicename is the name of the server as viewed in services.msc
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