Inheritance mapping, storing new object associated with pre-existing super object

[Matt Mastrangelo]

I'm trying to figure out how to store a new persisted object that 
extends a pre-existing object. 

For example, I have 3 classes: Person, Student, and User.  Student and 
User extend Person.  A Student object already exists, and I now want to 
create a User object that inherits from the same Person as the Student 
object.  Is this possible?  Here's a code example:

User user = new User();
user.setLoginName("matt");
user.setPersonOid("001"); // A pre-existing person
broker.beginTransaction();
broker.store(user);
broker.commitTransaction();
The result of the above code is a NEW empty person object being created 
with a newly generated OID (via a sequence).  How can I associate the 
new User with a pre-existing Person?

Thanks again.

Matt



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