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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).

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