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JPA Annotation IdClass Target: TYPE Implemented Interfaces: Annotation Specifies a composite primary key class that is mapped to multiple fields or properties of the entity. The names of the fields ... must correspond and their types must be the same. Example: @ IdClass (com.acme.EmployeePK.class) @Entity

JPA Annotation Attribute in javax.persistence. IdClass Class value default null Primary key class Since: JPA 1.0

, the primary key of the following Project entity class consists of two fields: @Entity @ IdClass ... class using the @ IdClass annotation. The ID class reflects the primary key fields and its objects

a persistence unit, An entity or IdClass class should implement the java.io.Serializable interface).

a Map, and uses a Compound Primary Key. The contained class therefore uses an @ IdClass . This all works ... .persistence.Id; import javax.persistence. IdClass ; import javax.persistence.ManyToOne; import javax.persistence.Version; @Entity @ IdClass (CompoundKeyMapItem.CompoundKeyMapItemId.class) public class

I know the following 2 ways to declare a composite Primary key: ********* Solution 1 ********* @Entity @ IdClass (CompositePK.class) public class A {     @Id private long uid ... only for entity objects (and not for embeddable classes). Consider using: @ IdClass (ZoneId.class

for an idclass . Return: boolean indicating whether the identifiable type has a single id attribute Inherited

. If the primary key is a composite primary key and is mapped as IdClass , an instance of the primary key class is used as the key. Since: JPA 1.0

. If the primary key is a composite primary key and is mapped as IdClass , an instance of the primary key class is used as the key. Since: JPA 1.0

attribute. Returns true for a simple id or embedded id; returns false for an idclass . Return: boolean

for a simple id or embedded id; returns false for an idclass . Return: boolean indicating

JPA Method in javax.persistence.metamodel.IdentifiableType boolean hasSingleIdAttribute () Whether the identifiable type has a single id attribute. Returns true for a simple id or embedded id; returns false for an idclass . Return: boolean indicating whether the identifiable type has a single id attribute Since: JPA 2.0

@ IdClass (PersonId.class) public class Person { public enum Gender {FEMALE, MALE}; @Id private String id

." This is a NetBeans restriction, not a JPA restriction. "An entity or IdClass class should implement the java.io

;  private Map assignements; } @Entity @ IdClass (Assignement.PK.class) public class Assignement

") @ IdClass (Video.VideoId.class) public class Video { protected String provider; protected String