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cannot use the gotopage method

 
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I have tried the servlet gotopage method by Maha, here is the method;
ServletUtilities.gotoPage("/Accounts/list_deputations.jsp",getServletContext(),request,response);public static void gotoPage(String address,ServletContext context,HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {RequestDispatcher dispatcher = context.getRequestDispatcher(response.encodeURL(address));System.out.println("Dispatch forward to ="+address);dispatcher.forward(request,response);}
I get the following error
java.lang.NullPointerException
at javax.servlet.GenericServlet.getServletContext(GenericServlet.java:205)
at ServletUtilities.gotoPage(ServletUtility.java:81)
the same redirection request works with response.sendRedirect("/Accounts/list_deputations.jsp");
I double checked my tomcat4.0.4 setup with this url:http://www.moreservlets.com/Using-Tomcat-4.html#Servlet-Reloading
Why? and how to solve it?
 
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