Non Persistable POJO extending a persistable POJO

[Priya Venkatesan]

I have a legacy application which we are migrating to hibernate and
I have a situation where a non peristable POJO extends a persistable POJO and this non persistable is passed on to an API which is then persisted using the hibernate API.

(e.g) B extends A

public createObject(A a)
{
//get hibernate sessionFactory, session
session.save(a);
}

Code which makes use of this API

public void caller(B b)
{
createObject(b);
}

This obviously is not working since hibernate is looking for a mapping for B which I do not have. Is there a way to make this work?

[sathish kumar]

Down-casting might not work, can you make B replicate hbm file and keep A as transaction object??

[Priya Venkatesan]

Can you please add more clarification?

[Arun Kumarr]

public createObject(A a)
{
//get hibernate sessionFactory, session
session.save(a);
}

Can't you not pass (non-persistent) Object B to this method. What is the exception you are getting?

[Arun Kumarr]

On second thought, check if it related to hibernate proxy?

[Edvins Reisons]

Why do you call the class B non-persistable? Is there anything that prevents you from mapping it?

[Priya Venkatesan]

Thanks for all your response. I got this figured out. All that I had to do was to map B to same table as its parent and specify polymorphism="explicit" in order for hibernate to return only instances of B.

I found my solution here:

http://www.hibernate.org/41.html