Two possibilities:
1) You included log4j.jar in your war file. If so, remove it.
2) You have a log4j.properties file in your war file. If so, remove it.
The typical way of logging your own apps is to modify the server/xxx/conf/jboss-log4j.xml
file.
For further reading and research:
http://wiki.jboss.org/wiki/Wiki.jsp?page=ScopedLoggingConfig
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