[jboss-user] [jBPM] - Re: timer job issues when disposing session in embedded j2ee process

[Jiri Svitak]

Jiri Svitak [https://community.jboss.org/people/jsvitak] created the discussion

"Re: timer job issues when disposing session in embedded j2ee process"

To view the discussion, visit: https://community.jboss.org/message/824730#824730

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Hi Umberto,
jBPM engine uses knowledge sessions for running process instances. Listeners are registered in the sessions. So your processes instance has not ended yet and you are trying to dispose its underlying session, which also contains your listener. That won't work.

So to solve the problem, I think that you should not try to dispose the session inside listener method. You should implement another (waiting) mechanism, which will dispose the session only when it is safe - when all process instances of the session are not running.

There are many patterns how to use sessions. For example:
- waiting mechanism, for example you can use waiting after startProcess() method, decrement CountDownLatch in the listener and after that dispose the session
- or you should not dispose the session when using timers (singleton session pattern) - because if you dispose session directly after startProcess(), the timer will not fire, because its session is not active
- ...

My two cents.
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