code: public static EmbeddedJettyBuilder.ServletContextHandlerBuilder addWicketHandler(EmbeddedJettyBuilder embeddedJettyBuilder,
                                                                                       String contextPath,
                                                                                       EventListener springContextloader,
                                                                                       Class<? extends WebApplication> wicketApplication,
                                                                                       boolean development){
          EmbeddedJettyBuilder.ServletContextHandlerBuilder wicketHandler = embeddedJettyBuilder.createRootServletContextHandler(contextPath)
                  .setClassLoader(Thread.currentThread().getContextClassLoader())
                  .addEventListener(springContextloader);
          return addWicketHandler(wicketHandler, wicketApplication, development);
      }
docs: Adds wicket handler at root context.