Hi

In my project I jave 2 persistence layers (2 jar projets : purpose is to migrate to JPA step by step transparantly).
- Core which uses Hibernate SessionFactory
- Jpa Core which uses EntityManager
Both use an identical jndi datatource
Each has its own Spring context, beans, and transactionManager.

My question is how can I have a transaction manager holding those 2 ?
Other point is we use Tomcat so no JTA.

You cannot do it unless you use JTA. If you use two separate TM, then each one will control a separate database connection and issue the commit/rollback independently. If you share the same database connection, things can go out of sync since a transaction might be attempted to be committed twice, or committed and then rolled back.

Thanks for your answer.
As we must use Tomcat (customer contractual request) whereas before we used Wild Fly (with JTA) because of cannot use JTA, so we must migrate functionnalities one by one with all services / daos involved.

Anthony