Java EE (Java Enterprise Edition) General Discussion

hi ,
i m making a web application using the MVC model arch. i m getting the error " java.lang.StackOverflowError" till now my app. includes
a servlet "ControllerServelet"
a request handler interface "RequestHandler"
a request handler class "Initialization"
and a jsp page "choice.jsp

this is the code

public class ControllerServlet extends HttpServlet
{
// Hash table of RequestHandler instance , keyed by request URL
    private Map handlerHash = new HashMap();
// Initialize mappings: not implemented here
   public void init() throws ServletException
   {
        // This will read mapping definitions and populate handlerHash
       handlerHash.put("/resources/choice.jsp",new handlerpkg.Initialization());
   }
    /**
     * Based on the USRL within our application , choose a RequestHandler
     * to handle the request and deletgating processing to it.
     * Return an HTTP error Code 404 (not found ) id there's no RequestHandler
     * mapped to this URL
      */
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
    {
        RequestHandler rh = (RequestHandler)handlerHash.get(request.getServletPath());
        if(rh==null)
        {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
        }
        else
        {
            //if we get to here, we have a handler for this request
            String viewURL= rh.handleRequest(request,response);
            if(viewURL==null)
            {
                //The RequestHandler has finished output: do nothing
            }
            else
            {
              // The RequestHandler told us the view to use
             //  Forward the response to it
                request.getRequestDispatcher(viewURL).forward(request,response);
                //response.sendRedirect(viewURL);
            }
        }
    }
}



public interface RequestHandler
{
    /**
     * @return the URL of the view that should render the response
     * (probably a jsp) , or null to indicate that the response has been
     * generated already and processing is complete.
     */
    String handleRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException;

}



public class Initialization implements RequestHandler
{
    /**
     * @return the URL of the view that should render the responnse
     * (probably a jsp), or null to indicate that the cesponse has been
     * output already and processing is complete.
     */
    public String handleRequest(HttpServletRequest request, HttpServletResponse response)
    {
        request.setAttribute("temp","manish");
        return  "choice.jsp";
    }
}

can i anybody tell the reason of this problem
and one more thing
right now i have hard coded the values in hash map

handlerHash.put("/resources/choice.jsp",new handlerpkg.Initialization());

so this controller servlet is still application dependant . can anybody suggest me any way to make it independant of application with an examplee
manish