Using an Entity (and their Primary Key) as another Entity's Id

Question

So, I\'m not sure how to ask this question, as it seems like it should be pretty easy to find the answer to this one.

I have 3 tables; ContentHeader, ContentType1 a

Answer 1

You can create a composite id class that only has the ContentHeader:

@Embeddable
public class ContentKey implements java.io.Serializable {

    @ManyToOne(cascade = {}, fetch = FetchType.LAZY)
    @JoinColumn(name = "ID", updatable = true)
    private ContentHeader header;
    // ...
}

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public abstract class Content {

    @Id
    public ContentKey  getContentKeyId()
    // ...
}

That should do the trick.