Help with CMSClassUnloadingEnabled

[Felipe Jaekel]

I have configured my Tomcat 7 with the following parameters:

-Xms4G -Xmx4G -XX:MaxPermSize=256m -XX:+UseTLAB -XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled -Dorg.apache.el.parser.COERCE_TO_ZERO=false

I've seen in several blogs and StackOverflow posts
that CMSClassUnloadingEnabled should sweep PermGen too, but checking in the
manager application after some undeployments, the PermGen value never
decreases.

Am I missing something? I'm using OpenJDK 7 update 51 64-bit.

Thanks