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  * Copyright (c) 2008, 2009 Sun Microsystems. 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
  * and the Eclipse Distribution License is available at
 * Contributors:
 *     Linda DeMichiel - Java Persistence 2.0 - Version 2.0 (October 1, 2009)
 *     Specification available from
// $Id: $
package javax.persistence;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

Designates a ManyToOne or OneToOne relationship attribute that provides the mapping for an EmbeddedId primary key, an attribute within an EmbeddedId primary key, or a simple primary key of the parent entity. The value element specifies the attribute within a composite key to which the relationship attribute corresponds. If the entity's primary key is of the same Java type as the primary key of the entity referenced by the relationship, the value attribute is not specified.

    // parent entity has simple primary key

    public class Employee {
       @Id long empId;
       String name;

    // dependent entity uses EmbeddedId for composite key

    public class DependentId {
       String name;
       long empid;   // corresponds to primary key type of Employee

    public class Dependent {
       @EmbeddedId DependentId id;
       @MapsId("empid")  //  maps the empid attribute of embedded id
       @ManyToOne Employee emp;

Java Persistence 2.0
@Target( {  })
public @interface MapsId {

(Optional) The name of the attribute within the composite key to which the relationship attribute corresponds. If not supplied, the relationship maps the entity’s primary key.
   String value() default "";
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