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https://issues.apache.org/jira/browse/LOG4J2-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15720670#comment-15720670
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Ralph Goers commented on LOG4J2-1589:
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I don't believe that property works the same way. As I recall, if the result of
the substitution contains a ${..} then that will recursively be interpolated.
It seems that here he wants the default value to also be a property. I don't
believe that is currently supported.
> Value nesting during property substitution
> ------------------------------------------
>
> Key: LOG4J2-1589
> URL: https://issues.apache.org/jira/browse/LOG4J2-1589
> Project: Log4j 2
> Issue Type: Wish
> Components: Configurators
> Affects Versions: 2.5
> Reporter: Dmitriy Neretin
> Priority: Minor
> Labels: features
>
> There is already a good description what "default value nesting" is:
> http://logback.qos.ch/manual/configuration.html#nestedSubst
> It is partially implemented in the log4j but it can still be improved.
> Example from that page above:
> - "${id:-${userid}}" If the *id* variable is not set, *userid* will be used.
> At the moment it works only if the default value is a concrete value:
> - ${path:-/only/concrete/path/can/be/used/here}
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