[jira] [Commented] (LOG4J2-595) Support plugin preloading through the standard javax.annotation.processing tool

["Ralph Goers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13961229#comment-13961229 ] 

Ralph Goers commented on LOG4J2-595:
------------------------------------

A "typical" user of log4j should only need log4j-api and log4j-core and no other dependencies.  I consider a typical user to be one who creates their own plugins and who may or may not preload them.  

We have added a lot of dependencies, such as the disruptor, and I am not entirely sure if they are optional or not. But adding more jars is going in the wrong direction.

There are two ways to address this issue that I see:
1. Create a maven plugin to replace the exec plugin.
2. Create an annotation processor for the compiler to use. If you want to put just the annotation processor in its own jar that would be OK. We would have to tell Maven users to use provided scope to keep Maven from including it when it packages.

> Support plugin preloading through the standard javax.annotation.processing tool
> -------------------------------------------------------------------------------
>
>                 Key: LOG4J2-595
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-595
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.0-rc2
>         Environment: Recent versions of Java and Maven
>            Reporter: Matt Sicker
>              Labels: annotations, compiler, plugins
>         Attachments: Move_plugin_annotations_to_their_own_module_.patch
>
>
> Currently, in order to preload plugins, you have to add an exec-maven-plugin task to scan your code. Ideally, there'd be an annotations artifact (at least for the plugin annotations, but really just has to have all the necessary ones used for this) and a processor artifact that you'd include in your project. Then the maven-compiler-plugin would automatically run that annotation processor on your project during the compile phase. This would require less work from the end user to support their own custom plugins.



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