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held in a Map, and uses a Compound Primary Key. The contained class therefore uses an @IdClass.IdClass; import javax.persistence.ManyToOne; import javax.persistence.Version; @Entity @IdClass(CompoundKeyMapItem.CompoundKeyMapItemId.class

I know the following 2 ways to declare a composite Primary key: ********* Solution 1 ********* @Entity @IdClass(CompositePK.class) public class A {     ... "> @IdClass(ZoneId.class) @Entity public static class A {     @Id

; ENTITY: @Entity @IdClass(PersonId.class) public class Person { public enum Gender

method  of @IdClass and multiple @Id fields and a non annotated POJO as shown in the manual

."This is a NetBeans restriction, not a JPA restriction. "An entity or IdClass class

;Assignement.PK, Assignement> assignements; } @Entity @IdClass(Assignement.PK.class) public

for a simple id or embedded id; returns false for an idclass. Returns

:   @Entity(name = "Video") @IdClass(Video.VideoId.class