xml配置的一个问题
配置了过滤器
<?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 ">

</web-app>
<filter>
<filter-name> Hello </filter-name>
<filter-class> com.qrsx.jsp.web.HelloFilter </filter-class>
</filter>
<filter-mapping>
<filter-name> Hello </filter-name>
<url-pattern> /* </url-pattern>
</filter-mapping>


为什么在filter下提示
the   marked   up   in   the   document   following   the   root   element   must   be   well   formed  
这个错误是什么意思   直接导致tomcat启动就报错

------解决方案--------------------
<web-app> 是根节点，你的filter要放在它里面。