code: protected void handleError(final HttpServletRequest httpServletRequest,
  			final HttpServletResponse httpServletResponse, final Throwable throwable)
  			throws ServletException, IOException {
  		HttpServletHelper helper = createServletHelper(httpServletRequest, httpServletResponse);
  		ServletUtil.handleError(helper, throwable);
  	}
docs: Called if a Throwable is caught by the top-level service method. By default we display an error and terminate the
  session.
  
  @param httpServletRequest the http servlet request.
  @param httpServletResponse the http servlet response.
  @param throwable the throwable
  @throws IOException an IO exception
  @throws ServletException a servlet exception