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From artnaseef <...@artnaseef.com>
Subject Re: ActiveMQ hangs and i don't understand why
Date Mon, 28 Mar 2016 00:05:55 GMT
BTW, once the JVM reaches the out-of-memory condition, it can become
impossible to perform any operations on it - such as obtaining stack dumps
and heap dumps.  With that said, a heap dump, or at least histogram, can
help determine the precise cause of the out-of-memory condition.

The jmap program provides one means to obtain heap dumps and histograms. 
Again, though, it may be unable to do so once the broker JVM runs out of
memory, so it may be necessary to run it before hitting that condition in
the hopes of capturing the cause earlier.  Watching heap usage with jconsole
or jvisualvm can also help here to determine if memory is "leaking" (i.e.
being consumed and not released more and more over time).



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