出现错误:java.lang.NullPointerException
index.jsp
_____________________________
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@page pageEncoding="GBK"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>留言本首页</title>
</head>
<body>
<jsp:useBean id="DBconn" scope="page" class="sea.DBconn"/>
<%
try{
Connection Conn=DBconn.GetConn();
out.println(Conn);
Statement stmt=Conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
String sql="select * from info order by id DESC";
ResultSet rs=stmt.executeQuery(sql);
while (rs.next()){
out.println(rs.getString("Title")+"<br>");
//out.println(rs.getString("URL")+"<br>");
}
}
catch(Exception e){
out.println("异常:"+e);
}
%>
</body>
</html>
_______________________________________
package sea;
import java.sql.*;
public class DBconn {
String url;
String user;
String pwd;
Connection conn;
public DBconn() {
url =
"jdbc:odbc:guestbook2";
user = "";
pwd = "";
conn = null;
}
public Connection GetConn() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection(url, user, pwd);
}
catch (Exception exception) {
exception.printStackTrace();
}
return conn;
}
}
------------------
错误如下:null 异常:java.lang.NullPointerException