连接池中有报错无法解决

package com.imooc.jdbc.sample;

import com.alibaba.druid.pool.DruidDataSourceFactory;
import common.DbUtils;

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

/**
 * Druid连接池配置与使用
 */
public class DruidSample {
    public static void main(String[] args) {
        //1.加载属性文件
        Properties properties=new Properties();
        String propertyFile= DruidSample.class.getResource("druid-config.properties").getPath();
        //空格->%20 | c:\java code\druid-config.properties
        //c:\java%20code\druid-config.properties
        try {
            propertyFile =new URLDecoder().decode(propertyFile,"UTF-8");
            properties.load(new FileInputStream(propertyFile));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        Connection conn=null;
        PreparedStatement pstmt=null;
        ResultSet rs=null;
        try {
            //2.获取DataSource数据源对象
            DataSource dataSource= DruidDataSourceFactory.createDataSource(properties);
            //3.创建数据库连接
            conn=dataSource.getConnection();
            pstmt=conn.prepareStatement("select * from employee limit 0,10");
            rs=pstmt.executeQuery();
            while (rs.next()) {
                Integer eno = rs.getInt(1); //JDBC中字段索引从1开始，而非0
                String ename = rs.getString("ename");
                Float salary = rs.getFloat("salary");
                String dname = rs.getString("dname");
                System.out.println(dname + "-" + eno + "-" + ename + "-" + salary);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            DbUtils.closeConnection(rs,pstmt,conn);
        }
    }
}