添加mysql数据源报错

添加mysql数据源不成功，什么原因啊？
无法连接数据源：未命名-4，具体原因：Communications link failureThe last packet successfully received from the server was 1 milliseconds ago.  The last packet sent successfully to the server was 1 milliseconds ago.。Received fatal alert: protocol_version

https://yonghong-1252949735.cos. ... %AD%A5%E9%AA%A4.pdf
参考此文档看下，有没有开启mysql服务

最后发现是驱动版本问题，按照文档更新驱动后恢复