jBoss 4.0.2 deploying same WAR multiple times causes jBoss to crash because of PermGem/Out-of-Memory Errors

Question

I develop web applications and I use jBoss 4.0.2 and when I have redeployed my WAR several times with eclipse, jBoss will crash because it runs out of memory. And when I hav

Answer 1

Try this (which applies to Sun's Java):

-XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=128m

CMS can actually GC the permanent generation heap (the heap where your classes are). Setting MaxPermSize is unnecessary, but the default is low for an application server.