No appenders found error when deploying/starting on Tomcat

[James Adams]

I am deploying an application onto Tomcat 5.5 and I keep getting this error:

log4j:WARN No appenders could be found for logger (org.apache.commons.digester.Digester.sax).
log4j:WARN Please initialize the log4j system properly.

The application provides a web service using Mule/Axis (I don't know if this information is relevant or not but just in case). This is a hello world program to prove Mule, with no unusual configuration as far as I can tell.

Can I remedy this by adding some sort of catch all appender to my log4j.properties?

The web application won't start but this is the only error I see in stdout*.log when I deploy or start the application. However this is only a warning, so I'm afraid that something else is going wrong that I'm not seeing in the log -- is this possible, and if so where else can I look for the problems?

If anyone can give me a clue as to why this error is happening and/or how I can get past this error I'll certainly appreciate the help. Thanks in advance.

--James