org.apache.log4j.Logger.getLogger(.class) seems to throw this exception. In the log4j.xml file, the appender "FILE" points to the org.jboss.logging.appender.DailyRollingFileAppender class.
Any idea what could cause this?
I assume you have multiple log4j.jar files in your app.
http://www.jboss.org/wiki/Wiki.jsp?page=ClassLoadingConfiguration