Briefly - NO!
Sessions are only shared within a "web application" which equates to a servlet context.
The servlet API originally had some methods that were more liberal but they got removed due to security concerns.
The original post was not clear on the scope that the objects were to be visible in. You have several choices, the whole application with ServletContext, the user's session with HttpSession and the individual request with objects attached to the ServletRequest and probably some more I have not thought of
Bill