java.lang.IllegalArgumentException: illegal initialSize 20, maxActive 8

driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/test?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai &allowPublicKeyRetrieval=true
username=root
password=abc123456
initialSize=20
MaxActive=20
​
错误提示：
/C:/Jdbchomework/out/production/Jdbchomework/druid-config.properties
九月 08, 2021 9:00:13 下午 com.alibaba.druid.pool.DruidDataSource error
严重: {dataSource-1} init error
java.lang.IllegalArgumentException: illegal initialSize 20, maxActive 8
	at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:869)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1376)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1372)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:109)
	at com.imooc.homework.jdbc1.sample.DruidSample.main(DruidSample.java:41)
	package com.imooc.homework.jdbc1.sample;
/**
 * Druid连接池的配置和使用
 */

import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.imooc.homework.jdbc1.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;

public class DruidSample {
    public static void main(String[] args) {

        Properties properties=new Properties();
        String propertyFile = DruidSample.class.getResource("/druid-config.properties").getPath();

       try {
            propertyFile = new URLDecoder().decode(propertyFile,"UTF-8");   //%20转化为空格
            //   1、加载属性文件
            properties.load(new FileInputStream(propertyFile));
       } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(propertyFile);

        Connection conn= null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        try {
            //   2、获取DataSource对象
            DataSource dataSource=DruidDataSourceFactory.createDataSource(properties);
            // 3、创建数据库连接

            conn=dataSource.getConnection();
            pstmt=conn.prepareStatement("select * from goods limit 0,10");
            rs= pstmt.executeQuery();

            while (rs.next()) {
                //next返回布尔值，如果存在下一条记录返回true,如果没有数据返回false
                // 结果集一系列get方法中参数可以输入字段索引或者字段对应的名称
                //JDBC中字段索引都是从1开始，而不是0
                Integer goodsId=rs.getInt(1);
                String name = rs.getString("name");
                float price = rs.getFloat(3);
                String desp = rs.getString("desp");;
                System.out.println(goodsId+"-"+name+"-"+price+"-"+desp);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            DbUtils.closeConnection(rs,pstmt,conn);
        }
        System.out.println(conn);





    }




}