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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.
/*
* 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.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* 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,
* java.sql.Timestamp.
*
*
* Example:
*
* @Version
* @Column(name="OPTLOCK")
* protected int getVersionNum() { return versionNum; }
*
*
* @since Java Persistence 1.0
*/
@Target({ANNOTATION_TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface Version {
}