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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.  The Eclipse Public License is available
 * at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
 * is available at http://www.eclipse.org/org/documents/edl-v10.php.
 */
package javax.persistence;

/**
 * Interface used to control transactions on resource-local entity
 * managers.  The {@link EntityManager#getTransaction
 * EntityManager.getTransaction()} method returns the
 * EntityTransaction interface.
 *
 * @since Java Persistence 1.0
 */
public interface EntityTransaction {

     /**
      * Start a resource transaction.
      * @throws IllegalStateException if isActive() is true
      */
     public void begin();

     /**
      * Commit the current resource transaction, writing any
      * unflushed changes to the database.
      * @throws IllegalStateException if isActive() is false
      * @throws RollbackException if the commit fails
      */
     public void commit();

     /**
      * Roll back the current resource transaction.
      * @throws IllegalStateException if isActive() is false
      * @throws PersistenceException if an unexpected error
      *         condition is encountered
      */
     public void rollback();

     /**
      * Mark the current resource transaction so that the only
      * possible outcome of the transaction is for the transaction
      * to be rolled back.
      * @throws IllegalStateException if isActive() is false
      */
     public void setRollbackOnly();

     /**
      * Determine whether the current resource transaction has been
      * marked for rollback.
      * @return boolean indicating whether the transaction has been
      *         marked for rollback
      * @throws IllegalStateException if isActive() is false
      */
     public boolean getRollbackOnly();

     /**
      * Indicate whether a resource transaction is in progress.
      * @return boolean indicating whether transaction is
      *         in progress
      * @throws PersistenceException if an unexpected error
      *         condition is encountered
      */
     public boolean isActive();
}