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https://issues.apache.org/jira/browse/LOG4J2-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233071#comment-17233071
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Ralph Goers commented on LOG4J2-2964:
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To be honest I would almost prefer removing the packages attribute as scanning
the class path for plugins is very slow. Plugins should be located using the
Log4jPlugins.dat file that gets generated by the annotation processor. In 2.x
these are located using ClassLoader.getResources() while in 3.x plugin
descriptions are located via ServiceLoader, both of which are orders of
magnitude faster.
> Merge "packages" from several Configurations in Composite Configuration
> -----------------------------------------------------------------------
>
> Key: LOG4J2-2964
> URL: https://issues.apache.org/jira/browse/LOG4J2-2964
> Project: Log4j 2
> Issue Type: Improvement
> Components: Configuration, Core
> Reporter: Valery Yatsynovich
> Priority: Major
>
> When multiple configuration files are used and default merge strategy is in
> place, the attribute {{"packages"}} of the latest configuration takes
> precedence. However multiple configuration files may declare custom Appenders
> defined as {{@Plugin}} and these plugins may be declared in different
> packages.
> The proposed improvement is to perform merging of {{"packages"}} attributes
> from multiple configuration files in {{DefaultMergeStrategy}}.
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