[hibernate-dev] what does ""DEBUG [org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl] (EJB default - 6) Skipping JTA sync registration due to auto join checking" mean?

I'm trying to help a user [1] that is complaining that a local database transaction is used, instead of the JTA transaction as they expect. I asked them to enable TRACE logging for { org.jboss.jca, org.hibernate, org.jboss.as.jpa + com.arjuna} and see the "Skipping JTA sync registration due to auto join checking" log message. What does the "skipping JTA sync registration due to auto join checking" mean exactly? [2] shows a small example of the log output with an active JTA transaction in use. Scott [1] https://issues.jboss.org/browse/WFLY-3619 XA END / un-enlist for database connection called to early [2] http://fpaste.org/125603/80296401/