*** cannot be resolved to a type 江湖就急,做个聊天室出错

<%@ page language="java" contentType="text/html;charset=UTF-8" import="com.onexu.chat.*,java.net.URLEncoder,java.io.UnsupportedEncodingException"%>
<%@ page import="cn.uvn.jforum.user.bean.session.*"%>
<%@ page import="cn.uvn.jforum.session.util.*"%>
<%@include file="channelInfo.jsp"%><%!
String getRoomLink(String name, String chnName) throws JspException, UnsupportedEncodingException {
checkChannel(chnName);
return "<a href='rooms.jsp?chnName="
+URLEncoder.encode(chnName,"UTF-8")
+"&name="
+URLEncoder.encode(name,"UTF-8")
+"'>"+name
+" ("
+ChipChat.getInstance().getChannel( chnName ).getRoomList().length
+")</a>";
}
%><%String userid_s=null;
UserSession userSession = (UserSession)SessionUtils.getAttribute(request, "userBean");
if (userSession != null && userSession.getUserMode() > 0) {
userid_s=Integer.toString(userSession.getAuthorID());
}
if ( userid_s==null ) { // Session timeout or not login...
%><%@include file="sessionerror.jsp"%><%
return;
}%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>企鹅聊天室 - 选择话题频道.</title>
<meta http-equiv="Content-Type" content="text/html; charset=euc-kr">
<link href="chipchat.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="white">
<table width="90%"  border="0" cellspacing="0" cellpadding="0" background="images/bar.gif" height="50">
  <tr>
        <td height="49" width="794"><font color="white"><span style="font-size:20pt;">&nbsp;&nbsp;</span></font><font face="Impact" color="white"><span style="font-size:20pt;">&raquo; 选择频道.</span></font></td>
        <td align="right" height="49" width="126"><a href="logout.jsp"><font color="white">登出...</font></a><font color="white">&nbsp;&nbsp;</font></td>
  </tr>
</table>
<p>&nbsp;</p>
<p><font size="+2">&bull; 频道主题.</font></p>
<ul>
  <li><%=getRoomLink("Movie/Video","Movie/Video")%></li>
  <li><%=getRoomLink("Sports/Leisure","Sports/Leisure")%></li>
  <li><%=getRoomLink("Computer/Internet","Computer/Internet")%></li>
  <li><%=getRoomLink("Game","Game")%></li>
  <li><%=getRoomLink("Humor","Humor")%></li>
  <li><%=getRoomLink("Entertainment","Entertainment")%></li>
  <li><%=getRoomLink("Etc","Etc")%></li>
</ul>
<P><font size="+2">&bull; 同龄交友.</font></P>
<ul>
  <li><%=getRoomLink("Anybody","Anybody")%></li>
  <li><%=getRoomLink("Teenagers","Teenagers")%></li>
  <li><%=getRoomLink("Twenties","Twenties")%></li>
  <li><%=getRoomLink("Thirties","Thirties")%></li>
  <li><%=getRoomLink("Forties","Forties")%></li>
  <li><%=getRoomLink("Fifties","Fifties")%></li>
</ul>
<P>&nbsp;</P>
<P>&nbsp;</P>
<P>&nbsp;</P>
</body>
</html>
---------------------------------------------------------------
错误信息
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 4 in the jsp file: /channel.jsp
Generated servlet error:
ChipChat cannot be resolvedAn error occurred at line: 16 in the jsp file: /channel.jsp
Generated servlet error:
UserSession cannot be resolved to a typeAn error occurred at line: 16 in the jsp file: /channel.jsp
Generated servlet error:
UserSession cannot be resolved to a typeAn error occurred at line: 16 in the jsp file: /channel.jsp
Generated servlet error:
SessionUtils cannot be resolved