在将应用部署到Tomcat6.0.16，启动tomcat出现：
The listener "*Listener" is already configured for this context. The duplicate definition has been ignored
此是tomcat的bug:https://issues.apache.org/bugzilla/show_bug.cgi?id=44423#c8
解决方法：升级tomcat到6.0.32，问题没有出现，此时报Error listenerStart
http://mythinkpond.wordpress.com/2011/07/01/tomcat-6-infamous-severe-error-listenerstart-message-how-to-debug-this-error/
添加log4j.properties到classes下面，问题解决。奇怪。。。