"Cannot resolve expression" error during start up with instance-id pointed to a system property

Issue

• When we set instance-id to a system property like so:

<subsystem xmlns="urn:jboss:domain:web:1.1" ... instance-id="${jboss.jvmRoute}">

• JBoss throws the following error during start up:

        ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 45) JBAS014613: Operation ("add") failed - address: ([("subsystem" => "web")]) - failure description: "JBAS014802: Cannot resolve expression 'expression \"${jboss.jvmRoute}\"' -- java.lang.IllegalStateException: Failed to resolve expression: ${jboss.jvmRoute}"