ORM Error - No discriminator found

I have the following tables: ---Hierarchy 1: Table per subclass without discriminator--- T1,T2,T3 T1 PK-Identity T2 PK- is FK from T1 T3 PK- is FK from T1 ---END: Hierarchy 1--- ---Hierarchy 2: Table per hierarchy--- T3 T3 PK- is FK from T1 is_simple, type = bit. (not mentioned in

Re: ORM Error - No discriminator found

I don't think you can use a bit typed column as the discriminator column. In fact, you don't need to specify the column and value at all, Hibernate will just create one automatically if you leave it out. Since the inner workings of the inheritance implementation are completely hidden, this