author: BigBross Team
This method uses the time currently set in the engine time source.
Parameters: bossa - the Bossa engine. the value returned by the transaction.exception: BossaException - if a Bossa error occurs.
This method sets the engine time source to the time provided. It should only be called by the prevayler instance providing persistence to the engine.
See Also: org.prevayler.TransactionWithQuery.executeAndQuery(ObjectDate)