The last packet sent successfully to the server was 0 milliseconds ago, The driver has not received

重装系统后第一次装mysql, 中间没有任何问题. 项目一跑起来访问数据库时提示:

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.

然后上网一查, 结果说是与Mysql空闲等待时间有关, 也照着修改了my.ini

1. [mysqld]  
2. wait_timeout=31536000  
3. interactive_timeout=31536000  

但是重启mysql后一样没用，

也有人说可以换成c3p0的连接方式, 但项目里不能改动,

最后猜想只有可能是mysql本身的问题了, 于是卸载了重装一个5.1版本的。

把sql导入后， 项目启动，连接成功了，没有再报错