Re: [seam-dev] Seam/jBPM integration within the SOA platform

Dan Allen wrote: > Of course, then you must have Seam doing all calls to jBPM or else you > will be outside of a transaction. I'm unaware of whether this was > considered (not saying it wasn't). That explains, though, why Seam has > the workInTransaction callbacks. This is the configuration we are using <service name="persistence"> <factory> <bean class="org.jbpm.persistence.jta.JtaDbPersistenceServiceFactory"> <field name="isTransactionEnabled"><false/></field> <field name="isCurrentSessionEnabled"><true/></field> </bean> </factory> </service>

This is similar to the seam configuration except that the JtaDbPersistenceServiceFactory will create a JTA transaction if one does not already exist.

The specific issue we are seeing relates more to the hibernate behaviour rather than explicit jBPM behaviour. The configuration in SOA is such that we end up using a JTASessionContext within hibernate and this is configured to close the session when the transaction terminates. Any subsequent transaction usage on the same session, or even manipulation of the objects outside of the transaction, will result in the following. > When running a seam example on the SOA platform we were seeing an > exception being thrown as a result of a hibernate session being used > after it has previously been closed, this was a SessionException with > the text "Session is closed!". The seam integration can reuse the same jBPM context in different transactions and also pass the hibernate objects outside of the transaction. Both of these scenarios result in unusable context and/or hibernate objects within the SOA environment. Kev BTW The two instances of passing objects outside of the transaction boundary were found in ProcessInstance and TaskInstance. Wrapping the invocation from Contexts created a transaction that also encompassed the method invocations on those objects.

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