struts2中filter不能启动
刚看struts2,弄一个小程序,但是tomcat一启动就报这样的异常
严重: Exception starting filter struts2
java.lang.NoClassDefFoundError: com/opensymphony/xwork2/config/ConfigurationProvider
严重: Error filterStart
2008-7-15 1:56:49 org.apache.catalina.core.StandardContext start
严重: Context [/strutstest] startup failed due to previous errors
web.xml是这样的
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
那位高手能告诉我那是为什么?