The last packet sent successfully to the server was 0 milliseconds ago

java连接mysql数据库的时候，提示：

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

解决方法：

（1）

检查url地址是否正确,ip地址要写成127.0.0.1或者写成localhost，端口号为3306。

（2）

修改mysql的配置参数

$sudo vim /etc/mysql/my.cnf

添加以下内容

[mysqld]

wait_timeout=31536000

intercative_timeout=31536000

(3)重启mysql

$service mysql restart