java.lang.OutOfMemoryError: Java heap space
   at sun.management.ThreadImpl.dumpThreads0(ThreadImpl.java:0)
   at sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:0)
   at org.netbeans.modules.sampler.Sampler$1.run(Sampler.java:191)
   at java.util.TimerThread.mainLoop(TimerThread.java:0)
   at java.util.TimerThread.run(TimerThread.java:0)