Accessing a value from a servlet in a gwt Entry point class

[sriram]

Hi,

I am doing a sample login application using login jsp, tomcat and gwt.
I would like to pass username from the login servlet after a
successful login to gwt entrypoint class either using a session or
static variable

Code snippet using static variable
Login servlet

pubcli class LoginServlet extends HttpServlet{
  public void doPost(Request, Response){
   // call to database
  String username = request.getParameter("userName") ;
  if(loginSuccess){
     Sample.loginUserId = username ;
}

}
}

Sample EntryPoint class

public class Sample implenents EntryPoint{
  public static String          loginUserId              ;
  public void onModuleLoad(){
   Window.alert(loginUserId) ;
}
}

output: null ;

Any suggestions are appreciable.
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