Any comment?
The documentation says:
"Whenever you do not provide transaction boundaries inside your application, the engine will automatically execute each method invocation on the
engine in a separate transaction"
So, if I do not specify the TransactionManager (and do not start a transaction programmatically) I expect that a transaction manager is used transparently by JBPM. Indeed, it seems that org.drools.persistence.jta.JtaTransactionManager is used by default (throwing a NPE!). But that is quite confusing, since the persistence-unit's transaction-type is RESOURCE_LOCAL.
Any hint about that?