1.添加完MySQL和jdbc约束后，在配置文件内spring.datasource.driver-class-name=com.mysql.jdbc.Driver 报错，显示找不到驱动包，原因是：
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>provided</scope>
</dependency>
添加上scope约束，重新导入就好了。然后再次启动项目，仍然报异常：
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.
意思是驱动包内的驱动类换了，改为：spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver 后就好了。
原文：https://www.cnblogs.com/blog411032/p/10187464.html