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JSP的有关问题呀 帮忙呀

热度:39   发布时间:2016-04-17 15:12:27.0
JSP的问题呀 帮忙呀
在TOMCAT测试中遇到的
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
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root   cause

java.lang.NullPointerException
org.apache.jsp.index_jsp._jspService(index_jsp.java:86)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note   The   full   stack   trace   of   the   root   cause   is   available   in   the   Apache   Tomcat/5.0.28   logs.

JSP界面代码是
<%@   page   contentType= "text/html;   charset=gb2312 "   %>
<%@   page   import= "java.sql.* "%>
<jsp:useBean   id= "con "   class= "com.bwm.db.Conn "   scope= "page "/>
<html>
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">
<link   href= "css/default.css "   rel= "stylesheet "   type= "text/css ">
</head>
<body   background= "images/bg.jpg ">
<table   width= "100% "     border= "0 "   cellspacing= "0 "   cellpadding= "0 ">
    <tr>
        <td   height= "27 "   colspan= "3 "   align= "right "> <div   id= "link "> </div> </td>
    </tr>
    <tr>
        <td   width= "1 "   height= "36 "   background= "images/gbnavl.gif "> </td>
        <td   width= "99% "   background= "images/gbnavm.gif "> <div   id= "link1 "> <a   href= "student/ "> 学生注册 </a>   <a   href= "company/ "> 企业注册 </a> </div> </td>
        <td   width= "1 "   background= "images/gbnavr.gif "> </td>
    </tr>
</table>
<table   width= "100% "     border= "0 "   cellspacing= "0 "   cellpadding= "0 ">
    <tr>
        <td   height= "50 "     bgcolor= "#FFFFFF "> <div   id= "top "> <img   src= "images/top.gif "   width= "340 "   height= "38 "> </div> </td>
    </tr>
</table>
<table   width= "100% "   height= "400 "     border= "0 "   cellpadding= "0 "   cellspacing= "0 ">
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