#### 24.1.43. `@MapKeyEnumerated`

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The [`@MapKeyEnumerated`](http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyEnumerated.html) annotation is used to specify that the key of `java.util.Map` association is a Java Enum.

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See the [`@MapKeyEnumerated` mapping](#collections-map-bidirectional-example) section for more info.

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