问题
2.5 xsd and 3.0 xsd. Why there are 2 xsd?
Project Spec:
Server info: Apache Tomcat/7.0.27
Servlet version: 3.0
JSP version: 2.1
Java version: 1.6.0_32
<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>MyFirstApp</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
回答1:
Because your autogenerator (you generate this code with?) of Web.xml choice the last and better version for your xmlns:web and for your xsi:schemaLocation.
It's not a problem to have different xsd version on 2 elements of the web.xml I think. If you have a problem go to 2.5 version.
I see you are using JSP, maybe it's better to look to JSF2.0 + Primefaces 3.2 ?
来源：https://stackoverflow.com/questions/10829350/newbie-web-xml-eclipse-xsischemalocation-xmlnsweb