Getting to an object from JSP

OK I think I have the model thing figured out, alotgh I am not sure how 
my JSP knows what kind of object the model is representing (how does it 
know there is an attribute called 'name' for instance?)

Now, my 'controller' creates an object that I want to have session 
scope, and be able to access it from my JSP page when some other object 
is the model.

So, I saved it by using:
this.getCtx().getRequest().getSession().seAttribute("object1", obj);

Now I want to get to it from a JSP(similiar to useBean) and call one of 
its methods.
How do I do it?  Is the setAttribute approach the 'right' way to start?




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