Devinder Singh [https://community.jboss.org/people/dps_c] created the discussion

"jBPM support for clustered application server environment"

To view the discussion, visit: https://community.jboss.org/message/750513#750513

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Our application runs on webshere application server 7 (JEE5) and has urgent 
requirement to support clustered environment. That is 2 clones will be running 
to support our application. We have been using jBPM (with persistence) and 
during testing ran into a problem with optimistic locking when jBPM request are 
distributed to different servers. Even during starting any jBPM process, 
statefulKnowledgeSession.startProcess method call runs into problems because 
some other clone has potentially updated the SessionInfo. Also for different 
servers, we're using same SessionInfo id to create StatefulKnowledgeSession 
instance.
 Basically, ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(1, 
kbase, config, env); is used on all the clones. Currently we have two clones, 
but can have potentially more in future.

We're creating StatefulKnowledgeSession during server startup of each node. 
Code for creating this session is very similar to what's in the jBPM document. 
In addition, we are also using human task server by using MinaTaskServer, which 
is also started during server startup.

Can the community please suggest some best practices to make jBPM run in 
clustered environment. Below are some of the links that we have been using but 
not sure what's the best approach for supporting clustered environment.
 https://community.jboss.org/thread/195459?tstart=0 
https://community.jboss.org/thread/195459?tstart=0
 https://community.jboss.org/message/625902#625902?tstart=0 
https://community.jboss.org/message/625902?tstart=0

Thanks.
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