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From "jayson.minard" <>
Subject Threading problem in ActiveMQ 5.2.0 (from SVN tag) causing ConcurrentModificationException
Date Sat, 11 Oct 2008 22:52:27 GMT

Hello everyone,

We have a network of 5 brokers communicating via TCP on the default
connector.  We are running around 300,000 messages per hour on each broker
through a series of queues.  On every broker there is a point in time where
it hits a ConcurrentModificationException (see and they no longer
dispatch messages afterwards thereby freezing all of the queues.

This seems like a critical bug in a release candidate (or soon to be
candidate) so I wanted to post it to the list to see if others have
encountered it, or if there were ideas on a quicker fix.  The code is in the
midst of a few resource locks and is in a very important part of the broker,
so I am nervous about attempting a patch without knowing more about how the
inner workings behave

Any thoughts on the problem?

-- Jayson
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