Reports any primary key field or property defined as composite with @EmbeddedId in an entity class annotated with @IdClass. A composite primary key must correspond to either a single persistent field or property annotated with @EmbeddedId or to a set of such fields or properties annotated with @Id used in conjuntion with the @IdClass annotation.
See JSR 220: Enterprise JavaBeans, Version 3.0, Java Persistence API, ยง2.1.4.
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