Tomcat webapp hangs

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My webapp started to hang recently. I have managed to use jstack to take its thread dump when it was hanging. The dump is included here.

With the exception of one IN_NATIVE thread, all of the others are BLOCKED.

Any hint what could be the cause?

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mossaab On BEST ANSWER

After enabling GC logging, I found that Full GC starts to happen frequently at the time when the app hangs. It is likely that I have a memory leak. Its cause is a different question, though.