According the the jboss wiki's FAQ for this issue:
http://wiki.jboss.org/wiki/Wiki.jsp?page=Log4jConflictsInJBoss
Removing the log4j and commons-logging jars from your app should solve this problem.
Seems a bit less than graceful though, since any app being deployed will need to be
exploded, have their logging JARs removed, then re-zipped and deployed.
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