我JSTL1.2文件解压后把两个jar文件丢到D:\Web\WEB-INF\lib中,然后写了个JSP文件:
<%@ page language="java" contentType="text/html;charset=gb2312" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>JSTL用法</title>
</head>
<body>
<c:out value="高兴"/>
</body>
</html>
用IE打开http://localhost:9999/myweb/Demo.jsp: 出现错误提示:
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:156)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:146)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.24 logs.然后我把两个jar文件丢到C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib中,然后把刚才那个jsp文件丢到
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT中,这个时候再IE打开http://localhost:9999/Demo.jsp 这个时候程序正确执行,把我都搞晕了,找了很长时间都不知道原因,到此求教一下
<%@ page language="java" contentType="text/html;charset=gb2312" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>JSTL用法</title>
</head>
<body>
<c:out value="高兴"/>
</body>
</html>
用IE打开http://localhost:9999/myweb/Demo.jsp: 出现错误提示:
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:156)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:146)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.24 logs.然后我把两个jar文件丢到C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib中,然后把刚才那个jsp文件丢到
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT中,这个时候再IE打开http://localhost:9999/Demo.jsp 这个时候程序正确执行,把我都搞晕了,找了很长时间都不知道原因,到此求教一下
至于你的为什么会出错,很有可能是你改动之后又用IE访问,IE访问的是以前的缓存页面,而以前缓存的是显示出错的页面,其实实际上可能是正确。可以在页面地址后面加个"?fff=dfdfd",强制IE访问新的页面。
还有可能就是重新改变了JAR文件位置之后,最好重启下服务器,在某个程序的lib目录下改动JAR文件和在服务器lib目录下改动JAR文件,有可能是前者需要重启才能生效,而后者无需重启就可以认出来。
2:JAR包没有加载,重启TOMCAT
3.http://java.sun.com/jsp/jstl/core_rt试试