code: @RenderMapping
      public String initializeView(
              WebRequest webRequest,
              PortletRequest portletRequest,
              Model model,
              @RequestParam(required = false) String initialFilter) {
          this.setUpInitialView(webRequest, portletRequest, model, initialFilter);
          return "jsp/Marketplace/portlet/view";
      }
docs: Returns a view of the marketplace landing page
  
  @param webRequest
  @param portletRequest
  @param model
  @param initialFilter - optional request paramter. Use to init filter on initial view
  @return a string representing the initial view.