You will have to lock on the processInstance before you signal a workflow. Use 
Hibernate mechs 
http://www.hibernate.org/hib_docs/v3/reference/en/html/transactions.html#transactions-locking
 or your own locking service.

anonymous wrote : Command Executor in a cluster
If you mean executing jBPM processes in a cluster that works fine. You just 
have to lock the processInstance

Greetings

Rainer

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