WARNING [tid:215057,Q:A238ACFUBhVQXEFuqWPf] Reset AutoCommit failed: coremail@jdbc:mysql://172.28.254.240:3308/cmxt_log?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true; url=jdbc:mysql://172.28.254.240:3308/cmxt_log?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true; username=coremail; exception=com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 55,856,315 milliseconds ago. The last packet sent successfully to the server was 55,856,316 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.; elapsedTime=0 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 55,856,315 milliseconds ago. The last packet sent successfully to the server was 55,856,316 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.

这是一个MySQL连接超时的错误。错误消息指示最后一次成功接收到服务器数据包的时间距离现在已经超过了服务器配置的'wait_timeout'值。建议您考虑以下几种解决方案：

1. 在使用连接之前，可以在应用程序中检查连接的有效性，确保连接仍然可用。您可以使用一些简单的查询或操作来测试连接，以确保连接处于活动状态。

2. 考虑增加服务器配置中客户端超时的值。通过增加'wait_timeout'的值，可以延长服务器等待连接空闲的时间。这样可以避免连接超时导致的问题。请注意，此方法可能会增加服务器资源的消耗。

3. 可以使用Connector/J连接属性'autoReconnect=true'来避免此问题。设置'autoReconnect=true'将使连接在断开后尝试自动重新连接到MySQL服务器。

根据您的具体情况选择适合您的解决方案，并根据需要进行相应的配置更改。