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26
May
2011

Sending a SIGBREAK signal to a Java process to do a thread dump in Windows

In Linux / Unix if you want a Java process to do a thread dump, you can do a kill -3 <pid>.

In Windows, doing the equivalent requires sending a Ctrl+Break to the input console which results in a SIGBREAK being sent to the process. But what if you do not have an input console? A process started with javaw.exe like what Eclipse does has no input console where you can type in the Ctrl+Break.

So, if you have a running java process without an input console, how do you make it do a thread dump?

The answer is simple – use a utility called SendSignal. Very cleverly written stuff. The author’s description of how he wrote that and some other utilities as part of his Windows programming interests is a nice read.

So, download SendSignal and keep it handy as part of your developer arsenal.

SendSignal.exe <pid> will send a ctrl+break to the process. This will cause a Java process to do a stack dump to stdout.

There are other ways too. Those are for another post. :)

Related posts:

  1. Heap dump of a running JVM with jmap
  2. McAfee anti virus mcshield.exe process eats 100% CPU too often
  3. Identifying a thread with high CPU usage in a Java app
  4. Kaspersky ate my jconsole!
  5. Using -Xss to adjust Java default thread stack size to save memory and prevent StackOverflowError


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