docs: @Override
      public IPortalUrlBuilder getPortalUrlBuilderByPortletFName(
              HttpServletRequest request, String portletFName, UrlType urlType) {
          final IPortletWindow portletWindow =
                  this.portletWindowRegistry.getOrCreateDefaultPortletWindowByFname(
                          request, portletFName);
          if (portletWindow == null) {
              throw new IllegalArgumentException(
                      "Could not find PortletWindow for fname="
                              + portletFName
                              + " to create IPortalUrlBuilder");
          }
          return this.getPortalUrlBuilderByPortletWindow(request, portletWindow, urlType);
      }