网上下载了一个网站源码，jdk和tomcat都配置没问题，然后运行网站出现下面错误，希望能得到朋友的帮助，谢谢

HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.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 causejava.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.Apache Tomcat/5.0.28

解决方案 »

  1.   

    java.lang.NullPointerException应该是页面那块没有针对空指针异常处理，你看看你的jsp编译后servlet的index_jsp.java:86行，应该就找到问题！
      

  2.   

    index.jsp的86行抛出了一个异常，你可以把这个JSP文件的内容贴上来
      

  3.   

    <%@ 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">
      <tr>
        <td valign="top" bgcolor="#FFFFFF"><table width="100%"  border="0" cellspacing="0" cellpadding="0">
          <tr align="center" >
            <td width="50%" height="22"><div id="font1">学生求职</div></td>
            <td width="50%" height="22"><div id="font1">企业招聘</div></td>
          </tr>
          <tr>
            <td valign="top"><table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <%
    ResultSet rs=con.getRs("SELECT a.jobid,b.name,b.school,b.specialty,b.knowledge,a.job,a.emolument FROM tb_sjob AS a,tb_student AS b WHERE a.sname=b.sname and getdate()<=atime ORDER BY ptime DESC");
            while(rs.next()){
    %>
          <tr>
            <td valign="top"><font id="reg">&lt;&lt;</font><a target="_blank" href="view.jsp?sid=<%=rs.getString(1)%>">[<%=rs.getString(2)%>]毕业于[<%=rs.getString(3)%>，<%=rs.getString(4)%>，<%=rs.getString(5)%>]，欲求[<%=rs.getString(6)%>]职位，要求薪水[<%=rs.getString(7)%>]。</a>&nbsp;</td>
          </tr>
    <%
            }
            con.close();
    %>
          <tr>
            <td>&nbsp;</td>
          </tr>
        </table></td>
            <td valign="top"><table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <%
    rs=con.getRs("SELECT a.jobid,b.name,b.manage,a.job,a.emolument FROM  tb_cjob AS a,tb_company AS b WHERE a.cname=b.cname and getdate()<=atime ORDER BY ptime DESC");
            while(rs.next()){
    %>
          <tr>
            <td valign="top"><font id="reg">&gt;&gt;</font><a  target="_blank" href="view.jsp?cid=<%=rs.getString(1)%>">[<%=rs.getString(2)%>]主要经营[<%=rs.getString(3)%>]，招聘[<%=rs.getString(4)%>]职位，承诺薪水[<%=rs.getString(5)%>]。</a></td>
          </tr>
    <%
            }
            con.close();
    %>
          <tr>
            <td>&nbsp;</td>
          </tr>
        </table></td>
          </tr>
        </table></td>
        <td width="180" rowspan="2" valign="top" bgcolor="#F5f7f7"><table width="100%"  border="0" cellspacing="0" cellpadding="0">
              <tr>
            <td><table width="100%"  border="0" cellspacing="0" cellpadding="0">
              <tr>
                <td height="22" colspan="2" align="center"  background="images/tdbg.jpg"><div id="font1">登录入口</div></td>
              </tr>
              <form name="form1" method="post" action="login.jsp"><tr>
                <td width="37%" height="22" align="center">用户名：</td>
                <td width="63%">
                  <input name="username" type="text" size="12">
                </td>
              </tr>
              <tr>
                <td height="22" align="center">密&nbsp;&nbsp;码：</td>
                <td height="22"><input name="password" type="password" size="12"></td>
              </tr>
              <tr align="center">
                <td height="30" colspan="2">
                  <input name="select" type="radio" value="student" checked >
                  学生
                  <input type="radio" name="select" value="company">
                  企业</td>
              </tr>
              <tr align="center">
                <td height="30" colspan="2">
                  <input type="submit" name="Submit2" value="进入">
                  &nbsp;
    <input name="Submit" type="reset" value="重置"></td>
              </tr></form>
            </table></td>
          </tr>
    <tr>
            <td><table width="100%"  border="0" cellpadding="0" cellspacing="0" background="images/tdbg.jpg" >
              <tr>
                <td height="27"><div id="font1">友情链接</div></td>
              </tr>
    <%
    rs=con.getRs("SELECT address,name FROM tb_flink");
            while(rs.next()){
    %>
              <tr>
                <td height="22"><div id="link2"><a href="<%=rs.getString(1)%>" target="_blank"><%=rs.getString(2)%></a></div></td>
              </tr>
    <%
            }
            con.close();
    %>
            </table></td>
          </tr>
          <tr>
            <td>&nbsp;</td>
          </tr>
        </table></td>
      </tr>
    </table>
    <table width="100%" height="50"  border="0" cellpadding="0" cellspacing="0">
      <tr>
        <td height="1"bgcolor="#FFFFFF"><hr size="1" color="#CC3300" style="position:absolute;"></td>
      </tr>
      <tr>
        <td bgcolor="#FFFFFF">&nbsp;<a href="mailto:[email protected]">联系本站</a> | <a href="admin/">管理员入口</a> | &copy;2004 MingRi </td>
      </tr>
    </table>
    </body>
    </html>
      

  4.   

    connection对象在中间被关闭了，之后再又查询数据库，所以报错。个人见解
      

  5.   

    JSP页面 空指针错误 ，检查所查询的数据 哪里空指针了，
    最好把查询放后台处理在前台JSP显示所查询的数据
      

  6.   

    你应该把这个jsp生成的java文件发过来。。这才知道那一行是在哪里！从jsp看，可能是con空了，看看con的close是干嘛的了