M03 Q23 Which PlatformTransactionManager(s) can you use with JPA?

JPA can work with following transaction managers:

• JpaTransactionManager – recommended when working with one database and one Entity Manager

• JtaTransactionManager – recommended when working with multiple databases and Entity Managers, or when working with multiple databases and other transactional resources, for example one transaction needs to span Database and JMS Topic

Usage of JpaTransactionManager in case of multiple Databases / Transactional Resources / Entity Managers will cause each transaction, span only one resource, this is why JtaTransactionManager is required in this case.

Multiple Databases/Entity Managers Scenario with incorrectly used JpaTransactionManager for this case use JtaTransactionManager