Logic of Filter using sessions in java

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Java

Can anyone tell me whatz wrong with my logic? It all ways passing null point after this line,

System.out.println("Inside the filter.............."  );

and home.jsp(index page) did not display. here I want to filter every url and proceed only valid login users requests. here my logic..

FilterRequest.java

try{
         HttpServletRequest request = (HttpServletRequest) req;
             HttpServletResponse response = (HttpServletResponse) resp;
             System.out.println("Inside the filter.............."  );
         HttpSession session = request.getSession();
         User u = null;
         if(session.getAttribute("loggedUser")!=null){
             u = (User) session.getAttribute("loggedUser");
         }
         if (u!= null)
         {
             System.out.println("user does exits.." + u.getUname() );
             chain.doFilter(req, resp);
         }else{
             System.out.println("user does exits..");
             String message = "Please Login!";
             req.setAttribute("loginMsg", message);
             //response.sendRedirect("login2.jsp");
         }
     }catch(Exception e){
         e.printStackTrace();
     }

web.xml

<filter>
        <filter-name>FilterRequest</filter-name>
        <filter-class>com.mobitel.bankdemo.web.FilterRequest</filter-class>
  </filter>
  <filter-mapping>
        <filter-name>FilterRequest</filter-name>
        <url-pattern>/*</url-pattern>
  </filter-mapping>

Thank you!