If you still face the problem of

java.lang.OutOfMemoryError: PermGen space

Event you have increase the -XX:MaxPermSize.

You can try the following jvm args.

-XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled

Usually only java web container like tomcat / jboss / jetty with many contexts will need that flag.

But remember enabling this will decrease the performance. Use with care.

P.S. java 1.6 seems do not support CMSPermGenSweepingEnabled.