[jboss-user] [jBPM] - Multiple sessions and thread safety using jBPM persistence

[Jason J]

Jason J [https://community.jboss.org/people/jasonjho] created the discussion

"Multiple sessions and thread safety using jBPM persistence"

To view the discussion, visit: https://community.jboss.org/message/773528#773528

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For every workflow process I am creating a *new* separate kbase/ksession.   So every flow is bound to a unique session and *not* shared.

I have enabled JPA persistence and pass in the following env to *each* new session:


env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());
session = createNewSession(env)
session.startProcess(...)




I am getting Hibernate StaleObjectExceptions and OptimisticLocking errors when I perform multiple operations on different processes.
I am not sure what specific DB operation is causing this, but since each process is in its own KSession - how is this even possible?

What database update could be in contention between 2 threads in this case?

I am using jBPM5.2.

Any ideas???
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