数据库出现如下连接问题
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Mysql服务器默认的“wait_timeout”是8小时，也就是说一个connection空闲超过8个小时，Mysql将自动断开该connection。这就是问题的所。将会造成上面的异常。 set global wait_timeout=604800; set global interactive_timeout=604800; 输入以上两句就可以解决这个问题了
