https://github.com/javaee/jpa-spec: Java(TM) Persistence API 
Copyright (c) 2008 - 2017 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:
    Petros Splinakis - Java Persistence 2.2
    Linda DeMichiel - Java Persistence 2.1
    Linda DeMichiel - Java Persistence 2.0

/*******************************************************************************
 * Copyright (c) 2008 - 2017 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:
 *     Petros Splinakis - Java Persistence 2.2
 *     Linda DeMichiel - Java Persistence 2.1
 *     Linda DeMichiel - Java Persistence 2.0
 *
 ******************************************************************************/ 
package javax.persistence;

import java.lang.annotation.Repeatable;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.*;


Expresses a dependency on a container-managed EntityManager and its associated persistence context. 
Since:Java Persistence 1.0
/**
 * Expresses a dependency on a container-managed {@link EntityManager} and its
 * associated persistence context.
 *
 * @since Java Persistence 1.0
 */

@Repeatable(PersistenceContexts.class)
@Target({TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface PersistenceContext {

    
(Optional) The name by which the entity manager is to be accessed in the 
environment referencing context; not needed when dependency 
injection is used.

/**
     * (Optional) The name by which the entity manager is to be accessed in the 
     * environment referencing context; not needed when dependency 
     * injection is used.
     */
    String name() default "";

    
(Optional) The name of the persistence unit as defined in the
persistence.xml file. If the unitName element is
specified, the persistence unit for the entity manager that is
accessible in JNDI must have the same name.

/**
     * (Optional) The name of the persistence unit as defined in the
     * <code>persistence.xml</code> file. If the <code>unitName</code> element is
     * specified, the persistence unit for the entity manager that is
     * accessible in JNDI must have the same name.
     */
    String unitName() default "";

    
(Optional) Specifies whether a transaction-scoped persistence context 
or an extended persistence context is to be used.

/**
     * (Optional) Specifies whether a transaction-scoped persistence context 
     * or an extended persistence context is to be used.
     */
    PersistenceContextType type() default PersistenceContextType.TRANSACTION;

    
(Optional) 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
/**
     * (Optional) 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 
     * {@link EntityManager#joinTransaction joinTransaction} method.
     * @since Java Persistence 2.1
     */
    SynchronizationType synchronization() default SynchronizationType.SYNCHRONIZED;

    
(Optional) Properties for the container or persistence
provider.  Vendor specific properties may be included in this
set of properties.  Properties that are not recognized by
a vendor are ignored.  

/**
     * (Optional) Properties for the container or persistence
     * provider.  Vendor specific properties may be included in this
     * set of properties.  Properties that are not recognized by
     * a vendor are ignored.  
     */ 
    PersistenceProperty[] properties() default {};
}