How to quickly and accurately find out the memory leak points?

Hi, all.I have added a option -XX:+HeapDumpOnOutOfMemoryError in the bootstarp script of my application.
The application has been run for one day and the OOM error was thrown again. So I downloaded the hprof file and used MAT to parse it.
But after seeing the leak suspects I still have no idea what's wrong and what's the possible leak point.
Can anyone shard some experience how to find out the memory leak points quickly and accurately?
It would be more nice if you can take a loot at the leak supects.
Thanks,
SuoNayi

Furthermore, when I try to dump the thread stack, I can see the following errors/warns:
Thread 12135: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
Error occurred during stack walking:
sun.jvm.hotspot.utilities.AssertionFailure: Only used on C2 x86
     at sun.jvm.hotspot.utilities.Assert.that(Assert.java:15)
     at sun.jvm.hotspot.code.CodeBlob.getLinkOffset(CodeBlob.java:193)
     at sun.jvm.hotspot.runtime.amd64.AMD64Frame.senderForCompiledFrame(AMD64Frame.java:297)
     at sun.jvm.hotspot.runtime.amd64.AMD64Frame.sender(AMD64Frame.java:213)
     at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:184)
     at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:189)
     at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:102)
     at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:129)
     at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:50)
     at sun.jvm.hotspot.tools.JStack.run(JStack.java:41)
     at sun.jvm.hotspot.tools.Tool.start(Tool.java:204)
     at sun.jvm.hotspot.tools.JStack.main(JStack.java:58)

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