<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

public class SocketIOServletContextListener implements ServletContextListener {
    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        System.out.println("buy");
    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        System.out.println("start");
    }
}

<listener>
        <listener-class>
            my.package.listener.SocketIOServletContextListener
        </listener-class>
    </listener>