Communications link failure；；The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure；；The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

解决方案：

mysql数据库url中添加了autoReconnect=true&failOverReadOnly=false

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原文地址：https://www.cnblogs.com/zhaojinxin/p/7843323.html