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//$Id: Version.java 11282 2007-03-14 22:05:59Z epbernard $

//EJB3 Specification Copyright 2004-2006 Sun Microsystems, Inc.

package javax.persistence;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;

import static java.lang.annotation.RetentionPolicy.*;

/**

 * This annotation specifies the version field or property of an entity class that serves as its

 * optimistic lock value. The version is used to ensure integrity when performing the merge

 * operation and for optimistic concurrency control.

 *

 * Only a single Version property or field should be used per class; applications that use more

 * than one Version property or field will not be portable.

 *

 * The Version property should be mapped to the primary table for the entity class; applications

 * that map the Version property to a table other than the primary table will not be portable.

 *

 * The following types are supported for version properties: int, Integer, short, Short, long,

 * Long, Timestamp.

 *  

 * @author Emmanuel Bernard

 */

@Target({METHOD, FIELD}) @Retention(RUNTIME)

public @interface Version {}