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Understanding EclipseLink, 2.4
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Entities and Embedded Objects

You can use the @Embeddable annotation to map an embedded class. An embeddable is a special type of class that is not directly persistent, but persisted only with its parent entity. An embeddable can be referenced from an entity or another embeddable using the @Embedded annotation for a single reference, @EmbeddedId for an embedded id, or the @ElementCollection annotation for a Collection or Map reference. An embeddable can also be used in any Map key using the @MapKeyClass annotation.

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