在开启java服务器程序时候，web.xml中一直有各种各样错误，查找解决方案好久，都没有靠谱的，头大。忽然看到一条，司马当成活马医：http://stackoverflow.com/questions/13437569/what-does-this-web-xml-error-mean，其中一条解决方案如下：
replace
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">
with
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee;http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">
The solution is that you have to put semicolon between URLs
I am sure you will not get the error again :)
很好，try it and all errors gone. solved perfectly.
原文：http://www.cnblogs.com/playerboy/p/4229302.html