Loading class `com.mysql.jdbc.Driver'. This is deprecated...
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.
如果编译后报如上错误，是因为你的mysql版本比较新。
将配置文中的 driverClassName=com.mysql.jdbc.Driver 改为 driverClassName=com.mysql.cj.jdbc.Driver 就可以了。