Software caused connection abort: socket write err

我的项目用了 struts2 + hibernate,数据库是mysql,连接方式是采用tomcat的数据库连接池JNDI,运行后经常是隔一段时间就连不上数据库,需要重启TOMCAT才能正常运行,日志记录如下:

严重: Servlet.service() for servlet default threw exception
java.sql.SQLException: No operations allowed after connection closed.Connection was implicitly closed due to underlying exception/error:


** BEGIN NESTED EXCEPTION **

com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: Software caused connection abort: socket write error

STACKTRACE:

java.net.SocketException: Software caused connection abort: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2692)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2621)
...略

后来发现问题所在,原来是长时间不用这个连接后,JDBC会自动将连接释放,但hibernate用的数据库连接池还认为连接是可用的,于是访问就出现了问题,只有重新启动tomcat方可连上。

找到原因了,我的hibernate使用的是内置的连接池,而hibernate内建连接池非常不完善,会有"8小时连接无效"的问题,改用c3p0连接池后就好了。

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