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https://issues.apache.org/jira/browse/LOG4J2-1686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15662729#comment-15662729
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Ralph Goers commented on LOG4J2-1686:
-------------------------------------
The Script documentation referenced above describes in general how scripts may
be used in Log4j. You would need to look at
http://logging.apache.org/log4j/2.x/manual/layouts.html#Pattern_Selectors,
http://logging.apache.org/log4j/2.x/manual/filters.html#Script, etc. for how
scripts can be used in various places in the configuration.
In general, I am not in favor of adding programming logic to XML. The places I
have seen that tried, such as Maven 1's use of Jelly, didn't turn out very
well. Furthermore, I don't believe that those expressions would work well in
JSON, YAML or in properties files.
OTOH, It should be quite possible to use a script to generate a configuration
using the ConfigurationBuilder API.
> Support conditional configuration
> ---------------------------------
>
> Key: LOG4J2-1686
> URL: https://issues.apache.org/jira/browse/LOG4J2-1686
> Project: Log4j 2
> Issue Type: New Feature
> Components: Configurators
> Affects Versions: 2.7
> Reporter: Raman Gupta
> Priority: Blocker
>
> It would be great to support conditional configuration like logback:
> http://logback.qos.ch/manual/configuration.html#conditional
> This allows for more advanced configuration than is currently possible with
> property substitution.
> Example use case: to implement
> https://issues.apache.org/jira/browse/LOG4J2-1685 without log4j library
> support.
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