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

/**
 * Defines mapping for composite foreign keys. This annotation
 * groups JoinColumn annotations for the same relationship.
 *
 *  When the JoinColumns annotation is used,
 * both the name and the referencedColumnName elements
 * must be specified in each such JoinColumn annotation.
 *
 * 
 *
 *    Example:
 *    @ManyToOne
 *    @JoinColumns({
 *        @JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
 *        @JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
 *    })
 *    public Address getAddress() { return address; }
 * 
 *
 * @see JoinColumn
 *
 * @since Java Persistence 1.0
 */
@Target({ANNOTATION_TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface JoinColumns {
    JoinColumn[] value();

	/**
	 * (Optional) The foreign key constraint specification for the join columns. This is used only if table
	 * generation is in effect.  Default is provider defined.
	 *
	 * @return The foreign key specification
	 */
	ForeignKey foreignKey() default @ForeignKey();
}