Change JVM options for Netbeans

I didn't use NetBeans very often, but I do use it often now because I need to work on some Swing application. Sometimes, I saw PermGen space OutOfMemoryError and similar to IntelliJ IDEA, I can change the JVM options for NetBeans to get rid of this error.

First, find where is the configuration file:

$ locate netbeans.conf
/Applications/NetBeans/NetBeans 6.9.1.app/Contents/Resources/NetBeans/etc/netbeans.conf
/Applications/NetBeans/NetBeans 6.9.1.app/Contents/Resources/NetBeans/etc/netbeans.conf.orig

Then, add the following line to netbeans.conf

-XX:MaxPermSize=512M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled