使搜索关键字高亮显示

当我在JSP中加入以下语句是
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
访问网页就出错，

HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:275)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.zw.Travel.servlet.BankServlet.list(BankServlet.java:62)
com.zw.Travel.servlet.BankServlet.alogin(BankServlet.java:44)
com.zw.Travel.servlet.BankServlet.service(BankServlet.java:27)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

是怎么回事呀，
请教牛人帮助，
初学者小妹；谢谢了；