If you really want to code SQL by hand, go for POJOs and raw JDBC DAOs. But this is also maybe an opportunity to rethink the way you're doing things and embrace ORM/JPA.
In the past, I have mixed bernate + EJB2 (CMP + BMP) sharing transactional contexts with no issues, using JTA. This problem is quite similar... Take a look at https://cwiki.apache. Org/GMOxDOC22/developing-bean-managed-persistence-with-jpa.html.
You can implement your own EntityManager. With luck, you may be even able to share transactional contexts.
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