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https://issues.apache.org/jira/browse/LOG4J2-1792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477503#comment-17477503
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Gary D. Gregory commented on LOG4J2-1792:
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Right, this was fixed under a different ticket for XML, and another for
property files (AFK)
> Support property substitution when reading Log4j 1.x property config files
> --------------------------------------------------------------------------
>
> Key: LOG4J2-1792
> URL: https://issues.apache.org/jira/browse/LOG4J2-1792
> Project: Log4j 2
> Issue Type: Sub-task
> Components: Configurators
> Affects Versions: 2.7
> Reporter: Mikael Ståldal
> Priority: Major
>
> I think that Log4j1ConfigurationConverter does not handle Log4j 1.x property
> substitution correctly. Log4j 1.x let you override properties with Java
> System Properties, but Log4j 2.x only do that when you specify $\{sys:key}.
> Right?
> So the converter needs to convert from $\{key} to $\{sys:key}, and also have
> some logic to handle the case of default value when present.
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