title: not able to retrieve session attributes in gwt
body: <p>i'm new to gwt.</p>
  
  <p>I am trying to set and get the http sessionattributes, but not able to retrive </p>
  
  <p>i've three pages in my application. page1 is for login. when the user enters the username and password, i'll get session using 
  HttpSession session = this.getThreadLocalRequest().getSession() and set them session attributes in the servlet. meanwhile i'll authenticate the user to the page2.
  In page2 i need the same username and password to authenticate the user to page3, where when i get session using HttpSession session = this.getThreadLocalRequest().getSession(), i get a new session and when i call session.getAttributes("username") and session.getAttributes("password"), i get only null values.</p>
  
  <p>Please let me know if the HttpSession session has to be made as an instance variable of the servlet or anything i'm missing</p>