I was having classcasting problems when I tried to retrieve an onlineassignment from the database by id.  after looking at my database, I see that all of the newly created online assignments have the same id!  So when it went to retrieve an assignment by id, it got a whole list of them.

Since the id field is part of the superclass Assignment, shouldn't it automatically generate a new one for each new assignment?  Should I have made another id for the subclass onlineAssignment?