如何在JPA中映射实体的复合键？

@Embeddable
public class CompositeKey implements Serializable {
    private Long firstKey;
    private Long secondKey;

    // 构造函数、getter和setter方法省略
}

@Entity
public class MyEntity {
    @EmbeddedId
    private CompositeKey id;

    private String attribute1;
    private String attribute2;

    // 构造函数、getter和setter方法省略
}

public interface MyEntityRepository extends JpaRepository<MyEntity, CompositeKey> {
}