Error on jsp page (but works great on my desktop)

Question

Hi guys,
Here is a weird thing that happened (it's always weird :-) ).
I built a simple application j2ee) which runs perfectly on my desktop. When I copied the webapp folder (Test) under the tomcat/webapps folder to my laptop (same directory) I get the error message below.
I have the same tomcat and same configuration.
Any idea???
Thanks for any help
Xian
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: Unable to compile class for JSP
An error occurred at line: -1 in the jsp file: null
Generated servlet error:
[javac] Since fork is true, ignoring compiler setting.
[javac] Compiling 1 source file
[javac] Since fork is true, ignoring compiler setting.
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:120)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:307)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:410)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:450)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:434)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:571)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:288)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:294)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:490)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1020)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:196)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:490)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1020)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2625)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:490)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1020)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:490)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1020)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:196)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:612)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:430)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:623)
at java.lang.Thread.run(Unknown Source)
Apache Tomcat/5.0.1

Answer 1

JSP page:
<%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@page import="java.util.*,model.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>View Info</title>
</head>
<body>
<center>
<%
     UpdateAndGet li = new UpdateAndGet();
     ArrayList list = (ArrayList)li.getAll();
%>
<table cellSpacing=1 cellPadding=3 border=1 width="100%">
     <tr>
          <th>ID</th>
          <th>Name</th>
          <th>Sex</th>
          <th>Testcode</th>
          <th>Email</th>
          <th>Cellphone</th>
          <th>Give Grade</th>
     </tr>
     <%
          Student stu = null;
          Iterator it = list.iterator();
          while (it.hasNext()) {
               stu = (Student) it.next();
               session.setAttribute(String.valueOf(stu.getId()), stu);
     %>
     <tr>
          <td><%=stu.getId()%></td>
          <td><%=stu.getName()%></td>
          <td><%=stu.getSex()%></td>
          <td><%=stu.getTestcode()%></td>
          <td><%=stu.getEmail()%></td>
          <td><%=stu.getCellphone()%></td>
          <td><a href="update.do?id=<%=stu.getId()%>">Give Grade</a></td>
     </tr>
     <%
     %>
</table>
<p><font color=blue>There are<%=list.size()%> examinees</font>
</center>
</body>
</html>