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
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