[hibernate-dev] "derived identifier" mapping

[Steve Ebersole]

What's the rational for supporting the following?


@Entity
class Product {
    ...
}

@Entity
class Order {
    ...
}

@Entity
@IdClass(...)
class OrderLine {
    @Id
    private Order order;

    @Id
    private Product product;
}

Specifically, the declaration of the OrderLine primary key.  Why would
these not have to be `@Id @ManyToOne`?