MySQL closes connections after 8 hours of inactivity. You either need to use a connection
pool that handles stale connections or use the "autoReconnect" parameter
For more details read here
http://dev.mysql.com/doc/refman/5.0/en/connector-j-usagenotes-troubleshoo...
Configure check-valid-connection in the -ds.xml file . For more details please refer here
http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossJCADatabaseFailover
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