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善良的各位?这是哪门子有关问题?小虾米在这谢过了

日期：2014-05-18　 浏览次数：20786 次

善良的各位?????????这是哪门子问题????????小虾米在这谢过了
各位prawn:       JSP页面调试出现难题:

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.reg2_jsp._jspService(reg2_jsp.java:79)
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原文如下:----------------------------------

<%@   page   contentType= "text/html;   charset=gb2312 "   language= "java "   import= "java.sql.* "   errorPage= " "   %>
<!DOCTYPE   HTML   PUBLIC   "-//W3C//DTD   HTML   4.01   Transitional//EN "   "http://www.w3.org/TR/html4/loose.dtd ">
<script   language= "javascript ">
function   backward()
{
history.back();
}
</script>

<html>
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">
<title> please   check   the   following   form </title>
</head>
<style   type= "text/css ">
<!--@import   url(css/jsp.css);-->
</style>

<body   bgcolor= "#FFFFFF "   text= "#006699 ">
<%@   page   language= "java "   import= "java.sql.* "%>
<jsp:useBean   id= "db "   scope= "page "   class= "opendb.opendb "/>
<%
String   uid=request.getParameter( "uid ");
String   sql= "select   *   from   custom   where   uid= ' "+uid+ " ' ";
ResultSet   rs   =   db.executeQuery(sql);
if(rs.next())
{
              rs.close();

%>
<p> sorry!   the   ID   your   selected   has   been   regestered   ,please   choose   another &nb

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