11.4. JDO vs. J2EE transactions
Each of J2EE and JDO provide their own mechanisms for managing transactions. In JDO this is the javax.jdo.Transaction object returned to applications from the persistence manager’s currentTransaction() method. In J2EE it is the javax.transaction.UserTransaction object. The UserTransaction is made available to EJBs through their session, entity or message-driven context objects, and to other J2EE components through JNDI lookups.
In the managed environment, JDO implementations can synchronize their transactions with the distributed J2EE transactions. This design feature is central to JDO’s ability to operate in these tiers. Where the container is managing transactions on behalf of a component, transaction demarcation ...
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