Michał Mański [
https://community.jboss.org/people/mmanski] created the discussion
"Re: Session and thread safety"
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https://community.jboss.org/message/762354#762354
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Hi,
I use JBPM 5.3.0.Final in my project. My application uses EJB 3.1/JPA 2.0 and runs on
JBoss 7.1.1.Final. I have similar problem with thread safety.
When I use one session for whole application, strange exceptions are thrown (e.g.
"javax.persistence.PersistenceException: error during managed flush ... caused by:
org.hibernate.AssertionFailure: collection [null] was not processed by flush()",
"javax.persistence.PersistenceException: error during managed flush ... Caused by:
java.util.ConcurrentModificationException" or "org.hibernate.HibernateException:
Found two representations of same collection:
org.jbpm.persistence.processinstance.ProcessInstanceInfo.eventTypes") if many users
use the application simultaneously. I tried to use the ProcessPersistenceContextManager
presented by Sebastian, but it didn't resolve the problem - errors still appear.
When I try to user another solution and create new session for every request, I don't
know how to dispose sessions. I read in documentation that this method must always be
called after finishing using the session, or the engine will not free the memory used by
the session. However, I don't know how to correctly dispose a session.
If I try to dispose session before end of transaction, an exception is thrown during
committing transaction: "javax.persistence.PersistenceException: error during managed
flush ... Caused by: java.lang.IllegalStateException: Illegal method call. This session
was previously disposed".
On the other hand, if i dispose session after transaction commits, another exception is
thrown: "Could not commit session: javax.persistence.TransactionRequiredException: No
active JTA transaction on joinTransaction call".
Does anyone know what is the correct way to dispose a session?
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