#### 24.1.31. `@IdClass`

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The [`@IdClass`](http://docs.oracle.com/javaee/7/api/javax/persistence/IdClass.html) annotation is used if the current entity defined a composite identifier.
A separate class encapsulates all the identifier attributes, which are mirrored by the current entity mapping.

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See the [Composite identifiers with `@IdClass`](#identifiers-composite-nonaggregated) section for more info.

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