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

转载：https://www.cnblogs.com/littlehb/p/9207293.html

报错信息：

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 
at com.tomymap.galaxy.virgo.util.DbService.getConnection(DbService.java:66) 
at com.tomymap.galaxy.virgo.util.DbService.getConnection(DbService.java:46) 
at com.tomymap.galaxy.virgo.dao.PNNDao.getConnection(PNNDao.java:51) 
at com.tomymap.galaxy.virgo.dao.DaoBase.executeUpdate(DaoBase.java:69) 
at com.tomymap.galaxy.virgo.dao.PNNDao.updatePNNRelation(PNNDao.java:161) 
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.buildPNNRelations(PyramidNeuralNetwork.java:400)
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.incrementalGenPNN(PyramidNeuralNetwork.java:144)
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.main(PyramidNeuralNetwork.java:410)

解决方法：
（1）使用JDBC URL中使用autoReconnect属性，url添加

autoReconnect=true&failOverReadOnly=false&maxReconnects=10  

（2） 修改MySQL的参数. /etc/my.cnf 添加

[mysqld]  
wait_timeout=31536000  
interactive_timeout=31536000  

（3）重启mysql

service mysql restart