java.lang.OutOfMemoryError: PermGen space about netbeans-plugin HOT 2 CLOSED

This looks like a problem caused by constant loading/unloading of Java classes inside NB.
You can alleviate it by adding some settings to your NB startup config, NETBEANS/etc/netbeans.conf

Look for "netbeans_default_options="
Add to the list of command-line options specified there...
-J-XX:MaxPermSize=256M -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSweepingEnabled

from netbeans-plugin.

The options works, but the file should be modified is not netbeans.conf, which will only affect the running option for the current netbeans running. To affect the netbeans that is run through the Run Project command, we need to modified the NETBEANS/harness/run.xml.

I am currently making the Ln172 of this file looks like:
property name="run.args.ide" value="-J-XX:MaxPermSize=256M -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSweepingEnabled"

Not sure If this may cause some other problem.

from netbeans-plugin.