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Changing my jboss-classloading.xml file to:

<?xml version="1.0" encoding="UTF-8"?>
<classloading xmlns="urn:jboss:classloading:1.0"
    domain="myapp-domain" 
    parent-domain="DefaultDomain"
    export-all="NON_EMPTY"
    import-all="true"
    parent-first="false"
    excluded="org.apache.log4j,org.slf4j"
    >
    <!-- Forces the use of JBoss provided log4j and slf4j implementations -->
</classloading>

resolved my problem.