jsp环境配置出现了问题

在安装jsp环境配置软件时，jdk和tomcat均以测试配置成功，打开网页运行jsp时出现 
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:126) 
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. 的错误，查询了下可能是数据库连接出现问题。又不知道怎么调，请问下高手该怎么解决问题啊 令附上tomcat work下index_jsp.java:
package org.apache.jsp;import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.sql.*;public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {  private static java.util.Vector _jspx_dependants;  public java.util.List getDependants() {
    return _jspx_dependants;
  }  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;
    try {
      _jspxFactory = JspFactory.getDefaultFactory();
      response.setContentType("text/html; charset=gb2312");
      pageContext = _jspxFactory.getPageContext(this, request, response,
       null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;      out.write("\r\n");
      out.write("\r\n");
      com.lyc.db.Conn con = null;
      synchronized (_jspx_page_context) {
        con = (com.lyc.db.Conn) _jspx_page_context.getAttribute("con", PageContext.PAGE_SCOPE);
        if (con == null){
          con = new com.lyc.db.Conn();
          _jspx_page_context.setAttribute("con", con, PageContext.PAGE_SCOPE);
        }
      }
      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\">\r\n");
      out.write("<link href=\"css/default.css\" rel=\"stylesheet\" type=\"text/css\">\r\n");
      out.write("<title></title>\r\n");
      out.write("<style type=\"text/css\">\r\n");
      out.write("<!--\r\n");
      out.write("body {\r\n");
      out.write("\tbackground-image: url();\r\n");
      out.write("}\r\n");
      out.write("-->\r\n");
      out.write("</style></head>\r\n");
      out.write("<body>\r\n");
      out.write("<table width=\"1006\"  border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td height=\"27\" colspan=\"3\" align=\"right\">&nbsp;</td>\r\n");
      out.write("  </tr>\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td width=\"1\" height=\"36\" background=\"SO01871_.wmf\"></td>\r\n");
      out.write("    <td width=\"1004\"><div id=\"link1\" style=\"width: 870; height: 19\"><a href=\"student/index.jsp\">学生注册</a>&nbsp;       \r\n");
      out.write("    <a href=\"teacher/index.jsp\">教师注册</a></div></td>\r\n");
      out.write("    <td width=\"1\" background=\"images/gbnavr.gif\"></td>\r\n");
      out.write("  </tr>\r\n");
      out.write("</table>\r\n");
      out.write("<table width=\"100%\"  border=\"0\" cellspacing=\"0\" cellpadding=\"0\" bordercolorlight=\"#FFFFFF\">\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td height=\"50\"  bgcolor=\"#FFFFFF\"><div id=\"top\" style=\"width: 624; height: 43\">&nbsp;&nbsp;       \r\n");
      out.write("        <font face=\"华文行楷\" color=\"#008080\" size=\"6\">学生成绩管理系统</font></div></td>\r\n");
      out.write("  </tr>\r\n");
      out.write("</table>\r\n");
      out.write("<table width=\"100%\" height=\"500\"  border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td height=\"100%\" valign=\"top\" bgcolor=\"#FFFFFF\">\r\n");
      out.write("        <img border=\"0\" src=\"images/bg2.JPG\" width=\"750\" height=\"500\">\r\n");
      out.write("    </td>\r\n");
      out.write("    <td width=\"180\" rowspan=\"2\" valign=\"top\" bgcolor=\"#F5f7f7\"><table width=\"100%\"  border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\r\n");
      out.write("          <tr>\r\n");
      out.write("        <td><table width=\"100%\"  border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\r\n");
      out.write("          <tr>\r\n");
      out.write("            <td height=\"22\" colspan=\"2\" align=\"center\"  background=\"images/tdbg.jpg\"><div id=\"font1\">登录入口</div></td>\r\n");
      out.write("          </tr>\r\n");
      out.write("          <form name=\"form1\" method=\"post\" action=\"login.jsp\"><tr>\r\n");
      out.write("            <td width=\"37%\" height=\"22\" align=\"center\">学号：</td>\r\n");
      out.write("            <td width=\"63%\">\r\n");
      out.write("                    <input name=\"username\" type=\"text\" size=\"12\">      </td>\r\n");
      out.write("          </tr>\r\n");
      out.write("          <tr>\r\n");
      out.write("            <td height=\"22\" align=\"center\">密&nbsp;&nbsp;码：</td>\r\n");
      out.write("            <td height=\"22\"><input name=\"password\" type=\"password\" size=\"12\"></td>\r\n");
      out.write("          </tr>\r\n");
      out.write("          <tr align=\"center\">\r\n");
      out.write("            <td height=\"30\" colspan=\"2\">\r\n");
      out.write("              <input name=\"select\" type=\"radio\" value=\"student\" checked >\r\n");
      out.write("              学生\r\n");
      out.write("              <input name=\"select\" type=\"radio\" value=\"teacher\">\r\n");
      out.write("              教师</td>\r\n");
      out.write("          </tr>\r\n");
      out.write("          <tr align=\"center\">\r\n");
      out.write("            <td height=\"30\" colspan=\"2\">\r\n");
      out.write("              <input type=\"submit\" name=\"Submit2\" value=\"进入\">\r\n");
      out.write("              &nbsp;       \r\n");
      out.write("<input name=\"Submit\" type=\"reset\" value=\"重置\"></td>\r\n");
      out.write("          </tr></form>\r\n");
      out.write("        </table></td>\r\n");
      out.write("      </tr>\r\n");
      out.write("<tr>\r\n");
      out.write("        <td><table width=\"100%\"  border=\"0\" cellpadding=\"0\" cellspacing=\"0\" background=\"images/tdbg.jpg\" >\r\n");
      out.write("          <tr>\r\n");
      out.write("            <td height=\"27\"><div id=\"font1\">友情链接</div></td>\r\n");
      out.write("          </tr>\r\n");ResultSet rs=con.getRs("SELECT address,name FROM tblink");
        while(rs.next()){      out.write("\r\n");
      out.write("          <tr>\r\n");
      out.write("            <td height=\"22\"><div id=\"link2\"><a href=\"");
      out.print(rs.getString(1));
      out.write("\" target=\"_blank\">");
      out.print(rs.getString(2));
      out.write("</a></div></td>\r\n");
      out.write("          </tr>\r\n");        }
        con.close();      out.write("\r\n");
      out.write("        </table></td>\r\n");
      out.write("      </tr>\r\n");
      out.write("      <tr>\r\n");
      out.write("        <td>&nbsp;</td>\r\n");
      out.write("      </tr>\r\n");
      out.write("    </table></td>\r\n");
      out.write("  </tr>\r\n");
      out.write("</table>\r\n");
      out.write("<table width=\"100%\" height=\"50\"  border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td height=\"1\"bgcolor=\"#FFFFFF\"><hr size=\"1\" color=\"#CC3300\" style=\"position:absolute;\"></td>\r\n");
      out.write("  </tr>\r\n");
      out.write("  <tr>\r\n");
      out.write("    <td bgcolor=\"#FFFFFF\">&nbsp;<a href=\"[email protected]\">联系本站</a> |<a href=\"admin\\index.htm\">系统管理员</a> | &copy;2007       \r\n");
      out.write("      xztccomputer </td>\r\n");
      out.write("  </tr>\r\n");
      out.write("</table>\r\n");
      out.write("</body>\r\n");
      out.write("</html>");
    } catch (Throwable t) {
      if (!(t instanceof SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          out.clearBuffer();
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
      }
    } finally {
      if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}
有高手帮忙解决下，最好留下qq细谈，或加本人qq739275264，不胜感激

解决方案 »

  1.   

    少数据库驱动out.write(）太过时了
    用<%=>都好些
      

  2.   

    为什么不直接写到jsp页面里呢,这样多方便啊
      

  3.   

    楼主发的jsp编译过后产生的java文件。
    while(rs.next()){ 貌似是在这行出的错，你看看你获取的rs是否为空
      

  4.   

    我查看了下，rs是牵扯：调用con对象的getrs方法从数据库tblink表中获取信息，估计还是数据库没连接上导致了rs空吧，可怎么解决啊，数据库的连接
      

  5.   

    我看你的rs是由con.getRs("sql");获取到的。
    肯定是getRs方法返回的是null了，你修改你的这个方法就可以啦
      

  6.   

    能否留下qq详谈啊，或加我qq，谢了