Dynamic class generation in combination with O/R

Question

Hello I am not so familiar with reflection, but I read the tutorial on the official Java page.
But what I can't find out is how to do this.
Say I want a class that is central to save all my persistable objects.
So instead of a saveUser, saveProfile, saveMachine, etc. i would only have saveObject.
But how do I do this?
What I want to accomplish is a function that does something like this (using hibernate):
public void saveObject( Object object)
...//get hibernate session
...//do something so that object is cast into either, User, Machine, Profile, etc.
...//so that it becomes object = (<good class name>) object;
...save(object);
...//close hibernate session
So it doesn't know what object it gets, but it should be known through reflection (or is there another way?) what it is.
I have thought about object.getClass() & forName() etc. but they all don't really seem to work for what i want.
Anyone has a suggestion or a solution?
Thank you.
edit:
example of what doesn't work:
Machine machine = new Machine();
Object o = machine;
Class c = o.getClass();
c object = (c) o;
c.forName("Machine") object;

Answer 1

The problem is that I want a function, that can accept all different kinds of objects.
I want to give this object to hibernate so i don't have to write different save functions (and get, and delete, and update etc.) for every object that I want to use in hibernate.
The non-dynamic way:
saveUser( User user )
save(user)
saveMachine( Machine machine)
save(machine)
saveXXXX( XXXX xxxx)
save(xxxx);
What I want:
saveObject( Object object)
save(object);
I appreciate the help :)