The driver is automatically registered via the SPI and manual loading of the driver class....

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.

問題原因： 
    升級后的mysql驅動類，Driver位置由com.mysql.jdbc.Driver 變為com.mysql.cj.jdbc.Driver 
解決方案： 
    將數據配置文件里spring.datasource.driver-class-name=com.mysql.jdbc.Driver修改為如下
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

原文地址：https://blog.csdn.net/qq_23994787/article/details/90400163