https://github.com/javaee/jpa-spec: Java(TM) Persistence API 
Copyright (c) 2011 - 2013 Oracle Corporation. 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.
Contributors:
    Linda DeMichiel - Java Persistence 2.1

/*******************************************************************************
 * Copyright (c) 2011 - 2013 Oracle Corporation. 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.
 *
 * Contributors:
 *     Linda DeMichiel - Java Persistence 2.1
 *
 ******************************************************************************/ 
package javax.persistence;


Specifies whether the persistence context is always automatically synchronized with the current transaction or whether the persistence context must be explicitly joined to the current transaction by means of the EntityManager.joinTransaction method. 
Since:Java Persistence 2.1
/**
 * Specifies whether the persistence context is always automatically 
 * synchronized with the current transaction or whether the persistence context
 * must be explicitly joined to the current transaction by means of the
 * {@link EntityManager#joinTransaction} method.
 *
 * @since Java Persistence 2.1
 */
public enum SynchronizationType {

    
Persistence context is automatically synchronized with the current transaction 
/** Persistence context is automatically synchronized with the current transaction */
    SYNCHRONIZED,

    
Persistence context must be explicitly joined to the current transaction 
/** Persistence context must be explicitly joined to the current transaction */
    UNSYNCHRONIZED,
}