code: @Override
      protected void sendSourceNotFound(FacesContext context, String message)
      {
          try
          {
              context.responseComplete();
              context.getExternalContext().responseSendError(HttpServletResponse.SC_NOT_FOUND, message);
          }
          catch (IOException ioe)
          {
              throw new FacesException(ioe);
          }
      }
docs: {@inheritDoc}