Annotation Type IdClass

public @interface IdClass

Specifies a composite primary key class that is mapped to multiple fields or properties of the entity.

The names of the fields or properties in the primary key class and the primary key fields or properties of the entity must correspond and their types must be the same.


   public class Employee {
      @Id String empName;
      @Id Date birthDay;

Java Persistence 1.0

Required Element Summary
 java.lang.Class value
          Primary key class

Element Detail


public abstract java.lang.Class value
Primary key class

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