code: public RequestDispatcher createRequestDispatcher(RequestImpl request, Klass<?> type, Object it, String viewName) throws IOException {
          return null;    // should be really abstract, but not
      }
docs: Creates a {@link RequestDispatcher} that handles the given view, or
  return null if no such view was found.
  
  @param type
  If "it" is non-null, {@code it.getClass()}. Otherwise the class
  from which the view is searched.