-> resources: i'm sorry, i'm new to the discussion board, too. so i have no 
idea where to find the original discussion thread.

-> exception: the exception is caught after all in org.jbpm.svc.Services in 
Line 226. The original Exception is caught earlier but gets wrapped into a 
JbpmPersistenceException and is thrown further. 

-> locking-mechanism: you could also use a simple process variable to indicate 
the locking. as kukeltje stated the problem is the failover-scenario. what 
happens if the server crashes and the lock stays?

another approach might be to change the isolaotion-level of the database. this 
way you could take advantage of the existing locking-mechnism provided by your 
database.

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