#### 24.1.45. `@MapKeyJoinColumns`

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The [`@MapKeyJoinColumns`](http://docs.oracle.com/javaee/7/api/javax/persistence/MapKeyJoinColumns.html) annotation is used to group several [`@MapKeyJoinColumn`](#annotations-jpa-mapkeyjoincolumn) mappings when the `java.util.Map` association key uses a composite identifier.

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