java.lang.NullPointerException。JSP报错

源程序代码：
package JavaBean;
import java.io.PrintWriter;
import java.sql.*;

import java.io.PrintWriter;
import java.sql.*;

public class DB_Conn {

private String driverName="com.mysql.jdbc.Driver"; //驱动程序名
private String userName="root"; //数据库用户名
private String userPwd="123456"; //密码
private String dbName="netshop"; //数据库名
private String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPwd; //连接字符串
private Connection conn=null; //数据库连接对象
public Statement sm=null; //数据库语句对象
private PrintWriter out = null;

// 建立数据库连接
public void ConnectDB(){
try {
Class.forName(driverName).newInstance();
conn=D

import java.io.File;
import java.io.FileInputStream;
import java.net.URI;
import java.sql.*;
import java.util.PropertyResourceBundle;

public class MySqlConnector {
/*
* 先在bin目录下新建一个dbCon.ini文件
* 内容 如下：
* userName=你的数据库用户名
* password=你的数据库用户密码
* database=要连接的数据库名称
*/
private static final String CON_NAME = "userName";
private static final String CON_PASS = "password";
private static final String CON_DNAME = "databaseName";

private Connection connection = null;

private MySqlConnector() {

}

public static MySqlConnector getInstance() {
return new MySqlConnector();
}

private boolean dataInit() {
boolean isOK = false;
String userName = "";
String password = "";
String databaseName = "";
PropertyResourceBundle rBoundle = null;