[logback-user] jmxConfigurator.objectName property replacement

Hi, I'm trying this flag in logback.xml: '<jmxConfigurator objectName="user:type=ngp,name=logging,instance=${com.sun.aas.instanceName},context=DEM" />' But the instance in jconsole is '${com.sun.aas.instanceName}' and not my cluster's name. How can I get around this? Regards, Nico