com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
长时间没连接mysql断开了，重新启动就好了。
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Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
异常解决：Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 解决
异常解决：Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
异常解决：Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 解决办法
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 数据库报错
问题记录——com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure