Embeddable
An Embedded class is a class whose instances are stored as part of an owning entity; it shares the identity of the owning entity. Each field of the embedded class is mapped to the database table associated with the owning entity.
To override the mapping information for a specific subclass, use the @AttributeOverride annotation for that specific class.
An embeddable entity is identified by the @Embeddable annotation.
Use this procedure to add embeddable persistence to an existing entity:
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Open the Java class in the Package Explorer.
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Select the class in the JPA Structure view.
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Click the mapping type hyperlink to open the Mapping Type Selection dialog.
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Select Embeddable and then click OK.
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Complete the remaining JPA Details view (for entities).
