Vaadin Flow的Beverage Buddy App(源码https://vaadin.com/start/lts/simple-ui)的持久

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@WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
	@VaadinServletConfiguration(ui = MainUI.class, productionMode = false)
	public static class MyUIServlet extends VaadinServlet {

		/**
		 * 
		 */
		private static final long serialVersionUID = 1L;
	}

一般vaadin的MainUI都要extends VaadinServlet ，这个Demo里的mainlayout怎么没继承，也能打开界面啊