String jarName = "";
try {
  Class c =
    Class.forName("JSPservletPkg.JSPservlet");
  Class[] parameterTypes = new Class[]
    {HttpServletRequest.class};
  Method m = c.getMethod("getJAR",parameterTypes);
  Object[] arguments = new Object[] {request};
  jarName = (String)m.invoke(null, arguments);
} catch(Exception e) {}