composite-id

i have a composite id defined on my class structure as below. Unfortunatly i always get a hibernate error that complains on the not found "part2": "Property of @IdClass not found in entity MoreClass : part2" Can anybody help me on fixing the problem? (or at least point me on a helpful jpa/hibernate doc?) @IdClass(ClassKey.class) @Entity public class MoreClass extends LessClass implements Serializable { @Id String part1; } @MappedSuperclass public class LessClass implements Serializable { @Id String part2; } public class ClassKey implements Serializable { String part1; String part2; } Michael

I want to use criteria to make the following query. I have an Entity with EmbeddedId defined: @Entity @Table(name="TB_INTERFASES") public class Interfase implements Serializable { @EmbeddedId private InterfaseId id; } @Embeddable public class InterfaseId implements Serializable { @Column(name="CLASE") private String clase; } And the criteria query that i am trying to do is: CriteriaBuilder criteriaBuilder = this.entityManager.getCriteriaBuilder(); CriteriaQuery<Interfase> criteriaQuery = criteriaBuilder.createQuery(Interfase.class); Root<Interfase> entity = criteriaQuery.from(Interfase.class);