Log4j PropertyConfigurator ConfigureAndWatch problem

Hi All,
I'm currently writing an EJB on OC4J and I'm using log4j. I want to make use of the PropertyConfigurator.configureAndWatch() method and have placed the line PropertyConfigurator.configureAndWatch("log4j.properties"); in the ejbCreate() method. However, if I change the level in the .properties file then this isn't picked up by the ejb - a real pain in the neck!
Has anybody else had any problems doing this? The properties file is in the applib dir of oc4j and is picked up without any problem when the server starts up.

Thanks in advance

Angus