java.lang.OutOfMemoryError: Java heap space
   at java.util.WeakHashMap.put(WeakHashMap.java:464)
   at org.netbeans.modules.sampler.SamplesOutputStream.internStackTrace(SamplesOutputStream.java:253)
   at org.netbeans.modules.sampler.SamplesOutputStream.writeSample(SamplesOutputStream.java:145)
   at org.netbeans.modules.sampler.Sampler$1.run(Sampler.java:193)
   at java.util.TimerThread.mainLoop(TimerThread.java:555)
   at java.util.TimerThread.run(TimerThread.java:505)