How to start a transaction in JPA using entityManager

Question

I have started working on an application which uses spring, hibernate, JPA, SOAP webservices. Now there is a requirement that certain queries have to be run in a transaction

Answer 1

The EntityManager instance returned by @PersistenceContext is always a container managed EntityManager. And container managed EntityManager are always JTA EntityManagers and hence their lifecycle is managed by the container. I guess now it makes sense as to why it is illegal to call getTransaction() on them.This might help