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From: <Michael.CTR.Tarullo@faa.gov>
To: <users@activemq.apache.org>
Subject: Need Help With A JMS Exception
Thread-Topic: Need Help With A JMS Exception
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Date: Wed, 31 Aug 2016 22:15:35 +0000
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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. messag=
e 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 tha=
t we can learn more about it.

It appears that the exception was related to a consumer acknowledging a mes=
sage.  We determined this from observing that the specific exception that w=
as 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 consume=
r and producer compiled with v5.11.0 of ActiveMQ.  The producer sends messa=
ges to a topic and the consumer receives these messages and then acknowledg=
es 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 t=
he ActiveMQMessage class to see if I could determine how my consumer call t=
o acknowkedge() landed on the TopicSubscription acknowledge(), but have bee=
n unable to make a connection between the acknowledge() function in ActiveM=
QMessage 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 offe=
r 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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