朋友，你好，你说的问题，我运行时成功了，可能是你安装的环境的问题。用j2sdk1.4.2和tomcat5.0即可，但我在运行其他程序如下：
<html>
<!--
Copyright (c) 1999 The Apache Software Foundation. All rights
reserved.
-->
<%@ page session="false"%>
<body bgcolor="white">
<jsp:useBean id='clock' scope='page' class='dates.JspCalendar' type="dates.JspCalendar" />
<font size=4>
<ul>
<li> Day of month: is <jsp:getProperty name="clock" property="dayOfMonth"/>
<li> Year: is <jsp:getProperty name="clock" property="year"/>
<li> Month: is <jsp:getProperty name="clock" property="month"/>
<li> Time: is <jsp:getProperty name="clock" property="time"/>
<li> Date: is <jsp:getProperty name="clock" property="date"/>
<li> Day: is <jsp:getProperty name="clock" property="day"/>
<li> Day Of Year: is <jsp:getProperty name="clock" property="dayOfYear"/>
<li> Week Of Year: is <jsp:getProperty name="clock" property="weekOfYear"/>
<li> era: is <jsp:getProperty name="clock" property="era"/>
<li> DST Offset: is <jsp:getProperty name="clock" property="DSTOffset"/>
<li> Zone Offset: is <jsp:getProperty name="clock" property="zoneOffset"/>
</ul>
</font>
</body>
</html>
时，出现错误提示，
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: dates.JspCalendar
org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:122)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1050)
org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:1078)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2156)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2206)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2212)
org.apache.jasper.compiler.Node$Root.accept(Node.java:484)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2156)
org.apache.jasper.compiler.Generator.generate(Generator.java:3228)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:284)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:437)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:555)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.ClassNotFoundException: dates.JspCalendar
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1365)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1212)
org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:120)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1050)
org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:1078)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2156)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2206)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2212)
org.apache.jasper.compiler.Node$Root.accept(Node.java:484)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2156)
org.apache.jasper.compiler.Generator.generate(Generator.java:3228)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:284)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:437)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:555)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
上面程序即为，tomcat5.0中所带例子jsp-examples中的dates/data.jsp 问题出在其在例子中运行时成功，而在把它改名后放在root下时却不行了，请指教。
另：朋友我也是新手，希望和你成为朋友，以后共同探讨，我的ＱＱ是１１３０８３８６７。
若在论坛中回复，请找发表者为wangguan的，回复。谢谢。
