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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: 20957 2011-06-13 09:58:51Z stliu $
package javax.persistence;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

Supports composite map keys that reference entities.

The MapKeyJoinColumns annotation groups MapKeyJoinColumn annotations. When the MapKeyJoinColumns annotation is used, both the name and the referencedColumnName elements must be specified in each of the grouped MapKeyJoinColumn annotations.

Java Persistence 2.0
See also:
@Target( {  })
public @interface MapKeyJoinColumns {
(Required) The map key join columns that are used to map to the entity that is the map key.
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