Howto print java class garbage collection events?

Question

java version \"1.5.0_14\"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
Java HotSpot(TM) Server VM (build 1.5.0_14-b03, mixed mode)

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Answer 1

To trace GC activity add this to java command:

-verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails

NPE that you are getting is probably you passing null value.