🚀 go-pugleaf

I have a servlet that is not working proporly. if you go to
http://www.novocode.com/doc/servlet-essentials/ and look at the
ListManagerServlet. The code is listed there. My server returns a 500
internal error code. I know it has to do with these lines:
  public void init(ServletConfig config) throws ServletException
  {
    super.init(config);
    filename = config.getInitParameter("addressfile");
       if(filename == null)
      throw new UnavailableException(this,
         "The \"addressfile\" property "+
         "must be set to a file name");
Because if I comment them out. it at least loads. But still will not run.
Does anyone have a clue what config setting I need to make is my servlet
proporties file in JRUN2.3.3?  I know the problem has to be there but I have
not the foggiest where to begin from there. I tried writing the creator but
he does not answer.

Thanks!