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From Peter Young <>
Subject ActiveMQ 5.1 has thread leak
Date Fri, 25 Jul 2008 03:34:59 GMT

For info:

Our application which uses publish/subscribe topics for communication using
AMQ 5.1 running on Solaris x86 (5.10 Generic_127112-06) with Java 1.6 (java
version "1.6.0_06",Java(TM) SE Runtime Environment (build 1.6.0_06-b02))
causes AMQ to leak threads. A new thread seems to be created every time a
published message is sent to a subscriber and eventually AMQ crashes with an
out-of-memroy error when these threads are not deleted. If no subscribers
have registered for the topic then no threads are leaked. Upgrading AMQ to
the latest 5.2 snapshot (5.2-20080723.231559-15) sees the problem solved,
though I do not know when in 5.2 development trunk the bug was fixed nor

I have not been able to reproduce this problem using the provided example
apps (producer/consumer) so presumed we were doing something wrong, though
because our application has been using the JBoss JMS providers (both JBossMQ
and JBoss Messaging) for some time without seeing this issue I figure it is
AMQ specific and therefore not necessarily related to our app. Our app is a
large multi-process distributed code so I cannot provide source but could
spend some time trying to cut it down into a manageable demo code if people
were interested. My question is: what bug was solved in AMQ 5.2 that fixed
the thread leak and have other people encountered this problem with AMQ 5.1?

Thanks, Peter
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