连接mysql报错：Communications link failure The last packet successfully received from the server was 3,544 milliseconds ago

异常错误：Communications link failure  The last packet successfully received from the server was 3,544 milliseconds ago

解决方法：

找到application-druid.yml文件

将testOnBorrow: false

修改为

testOnBorrow: true

原文：https://www.cnblogs.com/object360/p/13391412.html