code: public void visit(final WebApp webApp) {
  		NullArgumentException.validateNotNull(webApp, "Web app");
  		bundleClassLoader = new BundleClassLoader(webApp.getBundle());
  		httpContext = new WebAppHttpContext(
  				httpService.createDefaultHttpContext(), webApp.getRootPath(),
  				webApp.getBundle(), webApp.getMimeMappings());
  		try {
  			LOG.info("Pax Web not available. Skipping context params registration");
  			httpService.registerResources("/", "default", httpContext);
  			//CHECKSTYLE:OFF
  		} catch (Throwable ignore) {
  			LOG.error("Registration exception. Skipping.", ignore);
  		}
  		//CHECKSTYLE:ON
  	}
docs: Creates a default context that will be used for all following
  registrations and registers a resource for root of war.
  
  @throws NullArgumentException if web app is null
  @see WebAppVisitor#visit(WebApp)