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Why does java.lang.Object.hashCode takes half of my CPU time?

807580Jun 26 2010 — edited Jun 27 2010
Hi,
I have been benchmarked my multihreaded program using 
-agentlib:hprof=cpu=samples
and was surprised to find the following line: 
rank   self  accum   count trace method
   1 52.88% 52.88%    8486 300050 java.lang.Object.hashCode
I never explicitly call hashCode() in my program. What can be the reason for this?

Thanks!
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Locked on Jul 25 2010
Added on Jun 26 2010
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