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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;
import static javax.persistence.EnumType.ORDINAL;

Specifies the enum type for a map key whose basic type is an enumerated type. The MapKeyEnumerated annotation can be applied to an element collection or relationship of type java.util.Map, in conjunction with the ElementCollection, OneToMany, or ManyToMany annotation. If the enumerated type is not specified or the MapKeyEnumerated annotation is not used, the enumerated type is assumed to be ORDINAL.

   public enum ProjectStatus {COMPLETE, DELAYED, CANCELLED, IN_PROGRESS}

   public enum SalaryRate {JUNIOR, SENIOR, MANAGER, EXECUTIVE}

   @Entity public class Employee {
       public Projects<ProjectStatus, Project> getProjects() {...}

       public Map<SalaryRate, Employee> getEmployees() {...}

Java Persistence 2.0
See also:
public @interface MapKeyEnumerated {

(Optional) The type used in mapping a map key enum type.
    EnumType value() default ;
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