<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="

        http://java.sun.com/xml/ns/j2ee  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd

    ">

    ...
<listener>
<listener-class>com.alibaba.citrus.webx.context.WebxContextLoaderListener</listener-class> 
</listener>

    ...
</web-app>