Join multiple tables for one entity with JPA?

Question

I was wondering if it was possible to create an entity that fetches data from multiple tables.

I have an entity based on a TableA.

The particularity is that I also need data from TableD, which is linked to TableC, which is linked to TableB finally linked to TableA with TableA id

I am fully aware that I could create an entity on TableB,C,D. But I don't need ANY data on those tables except on TableD. B and C are just "a path to follow".

http://img11.hostingpics.net/pics/878537schema.png

I saw the @SecondaryTables annotation that I could use on EntityA but it seems like you can only join with the PK of EntityA.

If you know a solution that will prevent me from creating useless entities, I'd be grateful.

Answer 1

You can link each entity through inheritance strategy InheritanceType.JOINED. Then you can get all values of parent classes in child class.