| AfterCompletionAction | TODO : javadoc |
| BeforeCompletionManagedFlushChecker | Contract for checking whether to perform a managed flush in a javax.transaction.Synchronization#beforeCompletion() callback |
| ExceptionMapper | TODO : javadoc |
| CallbackCoordinator | Manages callbacks from the javax.transaction.Synchronization registered by Hibernate. |
| HibernateSynchronizationImpl | The Synchronization implementation Hibernate registers with the JTA javax.transaction.Transaction |