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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;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Repeatable;

/**
 * Expresses a dependency on a container-managed {@link EntityManager} and its associated persistence context.
 * @since Java Persistence 1.0
 */
@Target({TYPE, METHOD, FIELD})
@Retention(RUNTIME)
@Repeatable(PersistenceContexts.class)
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.
     * @return Name
     */
    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.
     * @return unit name
     */
    String unitName() default "";

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

    /**
     * (Optional) Specifies whether the persistence context is always automatically synchronized with the current
     * JTA transaction or whether the persistence context must be explicitly joined to the current JTA transaction by
     * means of the EntityManager joinTransaction method
     *
     * @since Java Persistence 2.1
     * @return sync
     */
    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.
     * @return properties
     */
    PersistenceProperty[] properties() default {};
}