@Target(value=TYPE) @Retention(value=RUNTIME) public @interface IdClass
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.
Example: @IdClass(com.acme.EmployeePK.class) @Entity public class Employee { @Id String empName; @Id Date birthDay; ... }
public abstract Class value
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