4-17
Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
No operations allowed after connection closed
解决之道：参考网上
1.在MySQL url中添加 autoReconnect=true
2.修改配置文件，在datasource的属性中添加
<property name="testWhileIdle" value="true" />
validationQuery = "select 1"
testOnBorrow = "true"
		<!-- some positive integer -->
		<property name="timeBetweenEvictionRunsMillis" value="3600000" />
		<!-- set to something smaller than 'wait_timeout' -->
		<property name="minEvictableIdleTimeMillis" value="18000000" />
</property>