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https://issues.apache.org/jira/browse/LOG4J2-494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115508#comment-15115508
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Ralph Goers commented on LOG4J2-494:
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First, enhancing XInclude isn't something we can realistically do. That is
handled by the XML processor. It also doesn't apply to Json, YAML or properties.
The way I planned on implementing this was to expect each configuration file to
be integrated from its root. Phillip is correct that different file formats
could be used as it would be the Node hierarchy that is actually being merged.
The simplest way to deal with the order of precedence would be based on the
order the user specifies them.
> Support composite configurations
> --------------------------------
>
> Key: LOG4J2-494
> URL: https://issues.apache.org/jira/browse/LOG4J2-494
> Project: Log4j 2
> Issue Type: New Feature
> Components: Configurators
> Affects Versions: 2.0-beta9
> Reporter: Ralph Goers
> Assignee: Ralph Goers
>
> Support was added to XMLConfiguration to allow XIncludes in the XML files.
> While this can be useful it does not allow for the use case where someone
> wants a default configuration and then a custom configuration to be merged
> with it.
> I am proposing creating a CompositeConfiguration class that accepts a comma
> separated list of configuration files. It would then use the Configuration
> factories to create the appropriate Configuration classes for each of the
> underlying files. It would then merge the Node hierarchies created by each
> into a single tree and then finally construct the actual configuration
> Objects from that tree.
> There are a few issues with this - for example each configuration can specify
> debug and verbose attributes, duplicate property settings, handling duplicate
> Appender names, etc. Most of these should be fairly easy to resolve.
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