BTW there was an attempt made at optimising acknowledgements which may
have an effect on your issue.

I wonder if disabling the 'optimizeAcknowledge' flag on an
ActiveMQConnection might help fix it?

You can add this to the connection URL like with async send...
http://incubator.apache.org/activemq/async-sends.html

via

tcp://locahost:61616?jms.optimiseAcknowledge=false


On 6/7/06, Hugo V <[EMAIL PROTECTED]> wrote:

Hello again,

We did more testing on this issues. I think the problem is related to the
pre-fetch parameter. If we force the prefetch to 1 on the connection
factory, then using a AUTO_ACKNOWLEDGE and non-transacted session is working
fine (but slow).

If we use the default pre-fetch  (1000) then messages are not all removed
from the queue.

Thank you

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