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From netbeans.conf: # If you specify the heap size (-Xmx) explicitely, you may also want to enable # Concurrent Mark & Sweep garbage collector. In such case add the following # options to the netbeans_default_options: # -J-XX:+UseConcMarkSweepGC -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSwe epingEnabled # (see http://wiki.netbeans.org/wiki/view/FaqGCPauses) I added these options to netbeans_default_options, everything is ok, but I get a warning: Please use CMSClassUnloadingEnabled in place of CMSPermGenSweepingEnabled in the future