为什么会报空指针异常呢？

package com.joey.jdbc.goods;


import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.joey.jdbc.common.DbUtils;
import com.joey.jdbc.goods.command.*;

import javax.sql.DataSource;
import java.io.FileInputStream;
import java.net.URLDecoder;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Properties;

public class GoodsData {
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        Properties properties = new Properties();
        String propertyFile = GoodsData.class.getResource("/druid-config.properties").getPath();
        try {
            propertyFile = new URLDecoder().decode(propertyFile, "UTF-8");
            properties.load(new FileInputStream(propertyFile));
            DataSource dataSource = DruidDataSourceFactory.createDataSource(properties);
            conn = dataSource.getConnection();
            String sql = "select * from goods";
            pstmt = conn.prepareStatement(sql);
            rs = pstmt.executeQuery();

            while (rs.next()) {
                Integer id = rs.getInt("id");
                String name = rs.getString("name");
                Float price = rs.getFloat("price");
                String desp = rs.getString("desp");
                Date create_time = rs.getDate("create_time");
                System.out.println(id + " " + name + " " + price + " " + desp + create_time);

            }


        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            DbUtils.closeConnection(rs,pstmt,conn);
        }
    }
}