Add these dependencies to the org.jboss.logging module - in other words edit modules/org/jboss/logging/main/module.xml
<module xmlns="urn:jboss:module:1.1" name="org.jboss.logging">
<resources>
<resource-root path="jboss-logging-3.1.0.GA.jar"/>
<!-- Insert resources here -->
</resources>
<dependencies>
<module name="org.jboss.logmanager"/>
<module name="org.slf4j" />
<module name="org.apache.log4j" />
</dependencies>
</module>
That fixed it for me.