今天在使用JDBC操作mysql时遇到下面的异常信息：

引用
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)

着实让人崩溃的信息，花费了一天的时间来解决。 
不罗嗦，直接描述解决办法。

  1. 配置：
  2. ubuntu10.10
  3. 5.1.49-1ubuntu8.1
  4. mysql-connector-java-5.1.18.jar

交互： 
300k records 
300k * 10 = 3M次访问mysql 
处理时间0.5h以内

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

  1. &autoReconnect=true&failOverReadOnly=false&maxReconnects=10

（2） 修改MySQL的参数. /etc/my.cnf 添加

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

（3）重启mysql

  1. service mysql restart

原因分析： 
（1）大量数据访问情况下，mysql connection连接有可能失效 
（2）长时间不妨问，connection会失效

更多参考： 
http://dev.mysql.com/doc/refman/5.1/zh/database-administration.html#dynamic-system-variables 
http://www.blogjava.net/heweiya/archive/2006/01/18/28483.html

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