In the persistence.xml, no jta-data-source or non-jta-data-source is specified.
Attempting to use the javax.persistence.jtaDataSource property (e.g. to reference a JBoss EAP datasource) in a property map supplied when creating the entity manager factory but the property seems to be ignored.
This may or may not be related to HHH-12858.
I asked you to create this, but upon further investigation I think this is really the same as the linked issue