Hi Everyone,

I have classes A, B, C, D, E and F where
B extends from A, C extends from B
D extends from A, E extends from D
F extends from A.

I want to use Joined inheritance strategy at A and Table per concrete class inheritance strategy from B,D and F level.
A,B and D are abstract classes and C,E and F are concrete classes.

Is this possible and if yes how should we do it. When I try, I end up getting separate tables for all 6 classes and I want 4 tables to get created (one for A and 3 for C,E and F respectively).

I used @Inheritance(strategy = InheritanceType.JOINED) in class A and
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS) in classes B,D and F

I have seen examples to mix table per hierarchy and joined inheritance strategies but I want to implement what I mentioned above without using table per hierarchy.

Please help me out.

Hi there,
Almost a year ago and no response...
I have the same problem now.
What I found out is that mixing inheritance strategy is not possible according to JPA spec. IMHO joined strategy is a spec flaw as you loose control about your tables since every class in hierarchy is reflected in DB regatdles if annotaded as entity or not (maybe abstract class is added just for technical reason).

However some things can be archieved by @SecondaryTable.
In my case I am still looking for a solution since I get exorbitant joins and bad performance with JPA / hibernate. Might be a specific scenario but without solution, I will have to go back to levels of iBatis or even JDBC, what I would like to avoid.

Cheers
Joerg