The Transaction Manager, the Transaction Synchronization Registry, and UserTransaction

You can access the Application Server transaction manager, a javax.transaction.TransactionManager implementation, using the JNDI subcontext java:comp/TransactionManager or java:appserver/TransactionManager. You can access the Application Server transaction synchronization registry, a javax.transaction.TransactionSynchronizationRegistry implementation, using the JNDI subcontext java:comp/TransactionSynchronizationRegistry or java:appserver/TransactionSynchronizationRegistry. You can also request injection of a TransactionManager or TransactionSynchronizationRegistry object using the @Resource annotation. Accessing the transaction synchronization registry is recommended. For details, see Java Specification Request (JSR) 907.

You can also access java:comp/UserTransaction.