Well U need to delete /META-INF/services/org.jboss.wsf.spi.invocation.InvocationHandlerFactory from
$JBOSS_HOME/modules/org/jboss/as/webservices/main/jboss-as-webservices-server-integration*.jar
Then provide your own jar containing your InvocationHandlerFactoryImpl and place it in
$JBOSS_HOME/modules/org/jboss/as/webservices/main folder
(including /META-INF/services/org.jboss.wsf.spi.invocation.InvocationHandlerFactory definition).