[jboss-user] [JBoss jBPM] - Jbpm - EJB LazyInitialization Exception

[jjacobwip]

Hi,

I was trying to learn jbpm and came across this scenario.

I was trying to create a Session Facade for my Process related activities (instantiate process instance, list tasks etc). I created a basic CMP EJB and added method to instantiate a ProcessInstance which is already deployed. For testing, I am calling this EJB method from a servlet using the remote interface of the EJB. 

In my EJB method, I am creating a new instance of my business process which is already deployed.  This method returns the newly created ProcessInstance. After that, in my servlet I am calling processInstance.signal()= and getting the below exception. 

18:42:12,484 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: org.jbpm.graph.def.Node.leavingTransitions, no session or session was closed
org.hibernate.LazyInitializationException
: failed to lazily initialize a collection of role: org.jbpm.graph.def.Node.leavingTransitions, no session or session was closed 
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(
AbstractPersistentCollection.java:358) 
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(
AbstractPersistentCollection.java:350)

If I do processInstance.signal() from my EJB itself, everything is working fine. 

I do understand that its a bad design to tightly couple the servlet and the EJB layer and there could be transaction issues, but just wanted to doube confirm it. 

Thanks in advance

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