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We have a application, which is doing frequent gc pauses(mostly young gen)[young gen has UseParNewGC]. Please suggest how to go about to debug the issue.
jVisualVM, gcViewer,Jrpofiler,jmap - which can help best or a combination of these.
Env:
Windows Server 2003
JDK 1.6

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It's hard to give any suggestions without more details. Every GC issue is specific.

But, you should start with : Is there a cookbook guide for GC problems?

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High frequent NewGen Collections are caused by a high allocation rate. VisualGC ("Sampler") should be sufficient to track down which classes are allocated most. A possibility to reduce newgen frequency is, to increase Eden size like described in e.g. here

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