Sergey Telezhnikov [http://community.jboss.org/people/fragmenthandler] created 
the discussion

"Process instance migration problem"

To view the discussion, visit: http://community.jboss.org/message/540145#540145

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My problem is that the migration sometimes doesn’t work. And I cannot 
understand why.
It would be good if someone could help me.

I deploy two process definitions that are very simple. Both have only 
sequential activities:
* First process definition: S-> A-> X-> E
* Second process definition: S-> A-> X-> B> E.
Where S is start activity, A, B and E are java activity and X is state activity.


First use case that works: I deploy two definitions. Then I instantiate and 
start the first definition. In this case migration works and it migrates in 
activity X of the second process definition and activity B is executed.

Second use case that doesn’t work: I deploy only the first process definition 
and then immediately run it. In this case execution waits for signal in 
activity X. Then I deploy second process definition, migrate instance to new 
second definition and signal the execution. But it will continue execution of 
the first definition, although running instance has a process definition Id set 
to the second definition.

I don’t understand what can be wrong. Can someone explain me how exactly does 
Deployment works and why it is different, when I deploy two process definitions 
immediately and start the first or sequentially and start in between the first. 
I use DefaultMigrationHandler from jBPM 4.2.
Sorry for my bad English.

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