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package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * 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. * *

 *
 *   Example:
 *
 *   @IdClass(com.acme.EmployeePK.class)
 *   @Entity
 *   public class Employee {
 *     @Id String empName;
 *     @Id Date birthDay;
 *     ...
 *   }
 * 
* * @since Java Persistence 1.0 */ @Target({TYPE}) @Retention(RUNTIME) public @interface IdClass { /** Primary key class */ Class value(); }




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