Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc .MySQLNonTransientConnectionException: No operations allowed after connection closed.网上查了下，由于使用了默认配置，空闲超过 小时，自动断开该连接我使用的是mybatis的默认连接池，于 ...
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异常信息 org.hibernate.exception.JDBCConnectionException: could not execute query at org.hibernate.e ...
问题 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。 可以用show global variables LIKE'wait_timeout';查看mysql的等待时间。 这就是问题 ...
原因分析 查看了Mysql的文档，以及Connector/J的文档以及在线说明发现，出现这种异常的原因是： 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。这就是问题的所在，在C3P0 ...
Failed to validate connection com.mysql.jdbc.JDBC4Connection@75dc8e4c (No operations allowed after connection closed.). Possibly consider using ...
signalled a Connection error is still in use! 2014-11-2 ...
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed ...
ERROR - No operations allowed after connection closed. 2011-12-07 11:36:09 - ERROR - query failed ...
