Hey,
There seems to be a duplicate of the persistence unit.
org.jboss.msc.service.DuplicateServiceException.
Please see if the same name is being used by any other persistence unit.
Also on a different note, a couple of observations :
I see that you have commented the look up class property. Please uncomment it and change the class from websphere to jboss.
Please remove the connection properties from the persistence unit org.jbpm.persistence.jpa, since you have defined a data source there.
Regards.