Mr Stansberry,

We're using sticky sessions, we understand how to configure them and as far as 
I know they are working correctly, but we are still seeing the "Possible 
concurrency problem" message."

To elaborate a little on our configuration, we use jBoss4.0.5GA with Apache 
2.2.4 on the front end using mod_proxy_ajp for load balancing.

There are actually 2 issues we are seeing:

1) The "Possible Concurrency Problem" message.  We are using REPL_ASYNC and 
REPEATABLE_READ in the tc5 cluster setup.  I should note that we used the same 
setup in our last environment which was 4.0.2 and everything worked fine.

2) Although we have mod_proxy_ajp setup to use sticky sessions, it doesnt 
appear to be doing that, hence the discovery of #1 above b/c we get NPEs 
accessing session attributes as mod_proxy distributes requests across multiple 
JBoss instances and the session attributes arent being replicated properly.

I think a solution to either of these 2 problems helps out everyone, although I 
recognize #2 is probably not within the scope of this thread.  I think 
regardless of StickySession (which I fully understand), there is an issue with 
Session replication.

Hope this helps and we appreciate your time and attention to this forum. Thank 
you.


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