How do you store Java objects in HttpSession?

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You are not adding the object to the session, instead you are adding it to the request.
What you need is: 

HttpSession session = request.getSession();
session.setAttribute("MySessionVariable", param);

In Servlets you have 4 scopes where you can store data.

  1. Application
  2. Session
  3. Request
  4. Page

Make sure you understand these. For more look here

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