Java - No stack traces available

Question

my application consumes 100% CPU - out of 200%. When I create a thread dump either by calling Thread.getAllStackTraces() or kill -3, I see that there are threads that consume a lot of CPU time, but their stack traces unavailable. They are not shown while CPU profiling.

The threads are: HandshakeCompletedNotify-Thread, Keep-Alive-Timer and process reaper. Their stack traces however are unavailable.

Keep-Alive-Timer and HandshakeCompletedNotify-Thread should not be native as far as I understand. In addition we don't have special permissions in java.policy or java.security files in jre.

How can I get the stack traces of these threads in order to solve the high CPU consumption?

You've [tried this, right?](http://stackoverflow.com/questions/266373/one-could-use-a-profiler-but-why-not-just-halt-the-program/317160#317160) — Mike Dunlavey, Apr 27 '11 at 17:49
Ctrl + Break is good for Windows as far as I know, the same option for linux is kill -3, that's what I've tried — Artiom Gourevitch, Apr 27 '11 at 17:53
It is very strange that these three consume much CPU. I'd suspected some networking issue, like DDoS of opening/closing SSL connections or something like this. — Vladimir Dyuzhev, Apr 27 '11 at 18:06
We also suspect networking issues, but we can't find the root cause. — Artiom Gourevitch, Apr 27 '11 at 18:10
Is this an application server? *Can* you control your security policy to prevent native everything and still see your application function? — Dilum Ranatunga, Apr 27 '11 at 18:44
Is it possible to try [jstack?](http://blogs.sun.com/alanb/entry/jstack) — Mike Dunlavey, Apr 28 '11 at 02:39

score 0 · Answer 1 · answered Apr 27 '11 at 17:52

0

Use a profiling tool like visual vm

It has CPU sampling and profiling support to show where the CPU consumption is.

answered Apr 27 '11 at 17:52

Aaron

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Tried. Because there are no stack traces available, profiler does not see these threads – Artiom Gourevitch Apr 27 '11 at 17:54

Java - No stack traces available

1 Answers1