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From <Michael.CTR.Taru...@faa.gov>
Subject Need Help With A JMS Exception
Date Wed, 31 Aug 2016 22:15:35 GMT
We had a rather unique situation some time ago where our message broker log was recording the
JMSException for an Invalid acknowledgement.

We traced it to the fact that the consumer of the message was using a more recent version
of ActiveMQ than our message broker was running (i.e. message broker was v5.5.1 and the consumer
was >v5.5.1).

We would like to recreate this error in one of our test environments so that we can learn
more about it.

It appears that the exception was related to a consumer acknowledging a message.  We determined
this from observing that the specific exception that was thrown appears to originate in only
one place, that is the acknowledge() function of the TopicSubscription class.

I have configured an environment with a v5.5.1 message broker and a consumer and producer
compiled with v5.11.0 of ActiveMQ.  The producer sends messages to a topic and the consumer
receives these messages and then acknowledges those messages.  The session was configured
for client acknowledgement.  Under these conditions I could not reproduce the exception described
above.

I tried looking through the source code for the acknowledge() function of the ActiveMQMessage
class to see if I could determine how my consumer call to acknowkedge() landed on the TopicSubscription
acknowledge(), but have been unable to make a connection between the acknowledge() function
in ActiveMQMessage and TopicSubscription even after following the calls starting with the
call to ActiveMQMessage acknowledge().

Can you offer any explanation as to why I am unable to trace the functions calls to TopicSubscription
acknowledge?  And more importantly, can you offer any advice on how I might recreate the exception
condition described here?

Thanks,
Mike

Michael Tarullo
Contractor (Engility Corp)
Software Engineer
FAA WJH Technical Center
(609)485-5294


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