Hi all,

I would like to know if this is possible:

I've got the two following classes:

class A
class B extends A

...each one have a mapping against a different table:
A -> TABLE_A
B -> TABLE_B

and some columns are replicated on both tables... legacy DB :-(

I need to "move" an instance of class B to class A (that is, copy the
data from TABLE_B to TABLE_A).

I try this way: i've got an instance of class B (let's say 'b') and make
a call to a method insert(A a) in one of my DAOs passing 'b' as argument. The implementation of insert() just makes a save on the current Session
with this object as argument.

I think (but i must be wrong) that, giving that b is an A, and my insert
method receives it as an "A" object, Hibernate should, when persisting, apply the A mapping (an insert against TABLE_A)... (and then i would
be very happy)... but no way: Hibernate always treats b as a "B" object,
apply the B mapping, and insert against TABLE_B...

Any tips?





PS: Pardon for my English... ;-)

This has nothing to do with Hibernate, that is OO language at play:
Declaration like
Public void insert(A a ) means that the method accepts A and all the subclasses of A, but at runtime the given object fully retains its true type, in your case: B.

If you want to copy B to A then BeanUtils class from Jakarta-commons may help:

Pubic A convert( B b ){
A a = new A();
BeanUtils.copyProperties( a, b);
Return a;
}