Hi,
I'm having a trouble in my application when trying to map superclass and subclass by OneToOne relationship. For example:
I have 2 classes: A and B, B extends A.


I want to map OneToOne between those 2 classes by their IDs, but I don't know how to put annotations on class B. Both of them have table in database and in each table, there's a ID column. Could you please help me to resolve this issue? Thank you very much.

Hi Napoleon,
I think the reason you've not had any responses so far is that it's not very clear what you are trying to do.
The problem has been abstracted so much that it doesn't really make sense:

You're saying all entities of type A must be associated to a B.
You're also saying that all Bs are As.
Thus all Bs must also be associated to a B, giving you a recursive nightmare.

Can you make this into more of a real world example?, explaining what you are actually trying to do, rather than giving an attempted solution.

Also, have a look into things such as @MappedSuperClass, @AssociationOverride and @Embeddable as these may help you to solve your problem.

Let us know if you sort it out.
Thanks,
Owen