关于数据库连接不上的问题，急

1.我的数据库版本是8.0.19.已经导入了相应的jar包，并使用build path将5.0.4的jar包更改为8.0.19的jar包并应用

2.在c3p0-config文件中的配置是：

<?xml version="1.0" encoding="UTF-8"?>

<c3p0-config>

  <default-config>

    <property name="driverClass">com.mysql.cj.jdbc.Driver</property>

    <property name="jdbcUrl">jdbc:mysql:///shop?characterEncoding=utf-8&amp;serverTimezone=UTC</property>

    <property name="user">root</property>

    <property name="password">root</property>

  </default-config>

</c3p0-config>

3.同时，工具类里面的UploadUtils.java报错，不知道如何更改。

报错信息是：The type javax.servlet.http.HttpServletRequest cannot be resolved. It is indirectly referenced from required .class files

4.在登录界面输入用户名密码后，控制台输出报错信息为：

警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@63b739a8 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client