Hello, everybody

I programmed a polymorphism parent-children Pojos like Parent, Child1 extends Parent, Child2 extends Parent, Child3 extends Parent with a table per subclass way. I need to use lazy fetching to all these objects.

I get a list of Parent, and I want to iterator them and get each real child object and to do some operations. It's obviously wrong as:
Child1 child = (Parent) parent;
because parent is a proxy object of Parent, but not Child1.

I really need the exact object of Child1/Child2/Child3 from the list, how can I get it from the parent object?

Should I load each Child class again respectively with the id of parent?

Thank you so much,

I found a class org.hibernate.engine.PersistenceContext, it has a method:

public Object unproxy(Object maybeProxy) throws HibernateException

But seems I can't get an instance of PersistenceContext.

Any suggestion?

Cast it to HibernateProxy.

Thank you very much.

And so my codes will be bond to Hibernate here, right?

Ok, if there's no better solution, I'll take this one.

Implement static helper.

static Object narrow(Object o){

if(o instanceof HibernteProxy){
return ((HibernteProxy)o).getLazyInitializer().getImplementation();
}else {
return o;
}

}

For Hibernate3, it's getHibernateLazyInitializer(). So it is:

private Object narrow(Object object){
if(object instanceof HibernateProxy){
return ((HibernateProxy)object).getHibernateLazyInitializer().getImplementation();
}else {
return object;
}
}

I tested it and it work very well. Thank you very much.