Message Title

It clearly states that the provider is expected to check for the provider name to match, and in case this is not specific then it may choose so; which implies in that case it's up to us to make a reasonable decision:

A provider may deem itself as appropriate for the persistence
unit if any of the following are true:
• Its implementation class has been specified in the provider element for that persistence unit
in the persistence.xml file and has not been overridden by a different javax.per-
sistence.provider property value included in the Map passed to the createEntity-
ManagerFactory method.
• The javax.persistence.provider property was included in the Map passed to cre-
ateEntityManagerFactory and the value of the property is the provider’s implementa-
tion class.
• No provider was specified for the persistence unit in either the persistence.xml or the
property map.

If a provider does not qualify as the provider for the named persistence unit, it must return null when
createEntityManagerFactory is invoked on it.