The validator XML Schema Validator is a delegating validator but no delegate can found for it 解决

 
莫名其妙出了个这错误

   把 web.xml  中换成

1<web-app   version= "2.4 "     
2        xmlns= "http://JAVA.sun.com/xml/ns/j2ee "     
3        xmlns:xsi= "http://www.w3.org/2001/xmlSchema-instance "     
4        xsi:schemaLocation= "http://JAVA.sun.com/xml/ns/j2ee   http://JAVA.sun.com/xml/ns/j2ee/web-app_2_4.xsd "> 
5

听说是个bug