From: Tom Mueller <tom.mueller_at_oracle.com>
Date: Fri, 02 Mar 2012 12:49:08 -0600

The output of list-system-properties always displays the substituted
values.
However, the property is being stored within the domain.xml file with
the variable there.

To see the unexpanded value, try:

asadmin get servers.server.server.system-property.*

Tom