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https://issues.apache.org/activemq/browse/AMQ-1920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45240#action_45240
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James Strachan commented on AMQ-1920:
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A work around is to use a prefetch of 1. I don't see the huge need for
supporting both prefetch size of zero and to support a notification of messages
being available. Afterall the only reason to use a prefetch of zero is if you
are gonna block a thread in a receive() method anyway.
> MessageAvailableListener doesn't work with prefetchSize set to zero
> -------------------------------------------------------------------
>
> Key: AMQ-1920
> URL: https://issues.apache.org/activemq/browse/AMQ-1920
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 4.1.1, 5.1.0
> Environment: Broker running ActiveMQ 4.1.1
> Client/Consumer tested with AMQ 4.1.1 and 5.1.0
> Reporter: Sebastian Riedel
> Priority: Critical
> Fix For: 4.1.1, 5.1.0
>
>
> The MessageAvailableListener doesn't trigger his event, when prefetchSize is
> set to zero, although messages are in queue (but because of prefetchSize =
> zero not dispatched). I understand why the complete asynchronous
> MessageListener is not allowed to be used with prefetchSize of zero, but in
> my opinion the AvailableListener should work.
> Since there is no other possibilty to check for the availability of a new
> message ( the Queuebrowser is for this aim to slow, because it produces
> massive traffic) this is a critical issue in my case, also because i can't
> use JMX to determine e.g. the QueueSize to trigger a MessageAvailableEvent
> myself.
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