初学者的struts问题..提示can not resolve symbol:class MessageResourses

找到了..我把类名打错了...
但是在浏览器输入jsp文件地址的时候出现了如下错误
exception javax.servlet.ServletException: javax/servlet/jsp/tagext/TagExtraInfo
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:244)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagExtraInfo
请问这是怎么一回事呢...?jsp文件如下:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %><html:html locale="true">
<head>
<title><bean:message key="hello.jsp.title"/></title>
<html:base/>
</head> <body bgcolor="white"><p>
<h2><bean:message key="hello.jsp.page.heading"/></h2><p>
<html:errors/><p> <logic:present name="personbean" scope="request">
<h2>
<bean:message key="hello.jsp.page.hello"/>
<bean:write name="personbean" property="userName"/>!<p>
</h2>
</logic:present> <html:form action="/HelloWorld.do" focus="userName">
<bean:message key="hello.jsp.prompt.person"/>
<html:text property="userName" size=16 maxlength="16"/><br>
<html:submit property="submit" value="Submit"/>
<html:reset/>
</html:form><br> </body>
</html:html>