ARN No appenders could be found for logger

log4j:WARN No appenders could be found for logger (org.apache.commons.digester.Digester.sax)

log4j:WARN Please initialize the log4j system properly.

在网上有许多介绍解决办法的文章，今天自己也遇到了，试了几次总算解决：

新建一个log4j.properties文件，内容如下：

log4j.rootCategory=TRACE, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=- %m%n

将文件拷贝到apache-tomcat-5.5.29的安装目录下的\common\classes下后，启动Tomcat的过程中不再报上述错误。