Hi,

We call the shell standalone.bat (or standalone.sh) specifying in the command line a -DmyVar="xxxx"

To notice, that the variable is also used in some other places inside the standalone.xml and the substitution works fine.

By example;

<subsystem xmlns="urn:jboss:domain:logging:7.0">

            ...

            <periodic-rotating-file-handler name="FILE" autoflush="true">

                <formatter>

                    <named-formatter name="PATTERN"/>

                </formatter>

                <file relative-to="jboss.server.log.dir" path="server${myVar:}.log"/>

                <suffix value=".yyyy-MM-dd"/>

                <append value="true"/>

            </periodic-rotating-file-handler>

            ...

</subsystem>

And in the case of myvar was not set (because i failed to set it), the substitution engine should replace anyway the "${myVar:}" by ""