Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
这个问题是升级完MySQL的链接驱动后出现的问题：
升级前版本的jdbc配置
jdbc.driverClass = com.mysql.dbc.Driver
jdbc.url = jdbc:mysql://127.0.0.1:3306/test?useSSL=false&useUnicode=true&characterEncoding=utf-8
jdbc.username = root
jdbc.password = root
升级后按照最新官方提示支持将com.mysql.jdbc.Driver 改为 com.mysql.cj.jdbc.Driver
jdbc.driverClass = com.mysql.cj.jdbc.Driver
jdbc.url = jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT（这个链接方式也要改变）
jdbc.username = root
jdbc.password = root
