Changing context(tool.session) object

I have used session tools before, but normally I can use the tool I put in session. 
In this case, I want to overwrite the tool, and keep it across the session, is there a way to do this?

ex: TurbineResources prop

tool.session.myObj = org.myapp.taglibs.Obj


Code:

Obj obj = (Obj)context.get("myObj");
obj = new Obj();

This doesn't seem to work because it doesn't actually change the session's reference? 
Or am I doing something wrong. Is there a better way to keep an object persistent in a session?

Thanks alot,

Sheldon Ross

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