出现异常”The last packet sent successfully to the server was 0 milliseconds ago.“的大部分原因是由于数据库回收了连接，而系统的缓冲池不知道，继续使用被回收的连接所致的。

以mysql为例：

第一种解决办法，就是将mysql回收空闲连接的时间变长，mysql默认回收时间是8小时，可以在mysql目录下的my.ini中增加下面配置，将时间改为1天。

单位是秒，最大好像是24天：

[mysqld]

wait_timeout=86400

第二种解决办法，可以通过配置，让缓冲池去测试连接是否被回收，如果被回收，则不继续使用，以dbcp为例：

#SQL查询,用来验证从连接池取出的连接           dbcp.validationQuery=SELECT 1           #指明连接是否被空闲连接回收器(如果有)进行检验，如果检测失败，则连接将被从池中去除           dbcp.testWhileIdle=true           #在空闲连接回收器线程运行期间休眠的时间值,以毫秒为单位，一般比minEvictableIdleTimeMillis小           dbcp.timeBetweenEvictionRunsMillis=300000           #在每次空闲连接回收器线程(如果有)运行时检查的连接数量，最好和maxActive一致          dbcp.numTestsPerEvictionRun=50           #连接池中连接，在时间段内一直空闲，被逐出连接池的时间(1000*60*60)，以毫秒为单位           dbcp.minEvictableIdleTimeMillis=3600000

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