错误信息为:
type Exception report

message

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

exception

javax.servlet.ServletException: [Microsoft][ODBC SQL Server Driver]无效的描述符索引
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:498)
    at org.apache.jsp.atline_jsp._jspService(atline_jsp.java:155)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:534)


root cause

java.sql.SQLException: [Microsoft][ODBC SQL Server Driver]无效的描述符索引
    at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6958)
    at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7115)
    at sun.jdbc.odbc.JdbcOdbc.SQLGetDataString(JdbcOdbc.java:3908)
    at sun.jdbc.odbc.JdbcOdbcResultSet.getDataString(JdbcOdbcResultSet.java:5702)
    at sun.jdbc.odbc.JdbcOdbcResultSet.getString(JdbcOdbcResultSet.java:356)
    at sun.jdbc.odbc.JdbcOdbcResultSet.getString(JdbcOdbcResultSet.java:413)
    at org.apache.jsp.atline_jsp._jspService(atline_jsp.java:127)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
    at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:534)


我的原程序为:
<%@ page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %>
<%@ page language = "java" import="java.lang.* ,java.sql.* ,java.util.* " %>
<html>
<head>
<title>录入成功</title>
</head>
<form >
<body>

<%!
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String sql = null;

public void jspInit() //执行数据库连结动作
{
    try
    {
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");    //载入驱动程式类别
        con = DriverManager.getConnection("jdbc:odbc:LocalServer"," "," ");    //建立数据库连线
        //建立Statement变量, 并设定记录指标类型为可前後移动
        stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
                         ResultSet.CONCUR_READ_ONLY);
    }
    catch(Exception ex)
    {
        System.out.println(ex.toString());
    }
}
public void jspDestroy() //关闭变量
{
    try
    {
        stmt.close(); //关闭Statement变量
        con.close();  //关闭Connection变量
        rs.close();  //关闭ResultSet变量
    }
    catch(Exception ex)
    {
        System.out.println(ex.toString());
    }
}
%>
    <table width = "760" align = "center" bgcolor = "lightgreen">
    <tr height = "5">
            <td>退出</td>
            <td>试题录入</td>
            <td>在线测试</td>
            <td>试卷生成</td>
            <td><a href="unitpoint.jsp">单元复习</a></td>
        </tr>
    </table>
    <table width = "760" align = "center" >
    <tr>
        <th>关键字</th>
        <th>章节</th>
        <th>单元</th>
        <th>难度系数</th>
    </tr>
    <%
       //访问数据库,选取所需要的信息
        sql = "select * from coursepoint";
        rs = stmt.executeQuery(sql);
        //显示数据信息于表格内
        while( rs.next() ){
    %>
    <tr>
        <td align = "center">
            <a href="point_detail.jsp?course_id=<%=rs.getString("course_id")%>"><%=rs.getString("keyname") %></a>
        </td>
        <td align = "center">
            <%=rs.getString("course_id")%>
        </td>
        <td align = "center">
            <%=rs.getString("unit_num")%>
        </td>
        <td align = "center">
            <%=rs.getString("degreed")%>
        </td>
    </tr>
    <% } %>
</table>
</body>
</form>
</html>

数据库列设计为?
point_id,course_id,unit_num,degreed,content,keyname,basic,important,difficult
因为不知道怎么贴图,所以没贴切图
我用的数据库是SQL server 2000