java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport

使用传统的servlet的时候出现下述的问题：

HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport

type Exception report

message javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.RuntimeException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport
com.xieyan.news.servlet.BaseServlet.service(BaseServlet.java:57)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.xieyan.news.utils.EncodeFilter.doFilter(EncodeFilter.java:17)
root cause

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupport
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:348)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.xieyan.news.servlet.BaseServlet.service(BaseServlet.java:45)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.xieyan.news.utils.EncodeFilter.doFilter(EncodeFilter.java:17)
root cause

出现问题百思不得其解，网上查找资料的时候，主要是重新编译项目，clean 重新部署什么的 ，无法解决。

使用环境

环境：Tomcat 7.0

使用的jar：jstl-1.2.jar和standard.jar

最终解决过程

去官网下载正确的jar，官网地址：http://archive.apache.org/dist/jakarta/taglibs/standard/binaries/



下载jakarta-taglibs-standard-1.1.2.zip 解压 将lib目录的下的jar拷到lib下即可。

或者去csdn下载我已经下载好的jar：http://download.csdn.net/detail/u010870518/9519028

最后，看了一下两个jar的不同之处还是很大的。