The persistence unit to use cannot be identified because multiple persistence units exist within the scope but no persistence unit name is specified for the reference. Explicitly specify the persistence unit name for the reference.

Description

Irrespective of the fact that two or more persistent units are defined in the reference scope of the persistent unit, the persistent unit name has not been specified in the reference.

Action

Specify the persistent unit name in PersistenceContext, PersistenceUnit annotation, or the <persistence-context-ref> and <persistence-unit-ref> tabs of the Deployment Descriptor.