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https://issues.apache.org/jira/browse/LOG4J2-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755010#comment-15755010
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Mikael Ståldal commented on LOG4J2-1741:
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As far as I can see, the Scala compiler generates a static bridge method in the
main class, with the annotation,
> scala: add support for creating custom plugins
> ----------------------------------------------
>
> Key: LOG4J2-1741
> URL: https://issues.apache.org/jira/browse/LOG4J2-1741
> Project: Log4j 2
> Issue Type: Improvement
> Components: Plugins
> Reporter: PJ Fanning
>
> I tried to add a custom appender using Scala but the pattern of having a
> class with an Plugin annotation and a static method on that class with a
> PluginFactory or PluginBuilderFactory annotation doesn't seem to work in
> Scala.
> In Scala, you can create a companion object to a class where you can
> implement the equivalent of static methods but these are not the same class
> under the hood. The Scala compiler builds 2 or more classes, the companion
> object gets a class name with a $ appended to it. I think this is affecting
> the lookup for the method with the Factory annotation.
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