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https://issues.apache.org/jira/browse/LOG4J2-2676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909857#comment-16909857
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Ralph Goers commented on LOG4J2-2676:
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I made those changes in support of LOG4J2-2621 which moved the plugin processor
to its own maven module and changed the processor to generate a Java source
file instead of a data file. That source file gets compiled as part of your
application and is then loaded by the service loader. To be honest, I don't
remember why I converted those System.outs to messager.printMessage - probably
because I just noticed they were there and writing to stdout directly is
usually the wrong thing to do.
Log4j 2.12.2 would be targeted at bug fixes only that are applicable to Java 7.
Right now we don't have anything targeted at that. Log4j 2.13.0 will require
Java 8. If you are OK with Java 8 I could changes just the system.out calls on
the release-2.x branch. However, Log4j 2.12.1 was just released and I am not
planning on doing another release build for at least a month as I will be
leaving on vacation in a week.
> Backport PluginProcessor use of javax.annotation.processing.Messager to
> 2.12.x/2.13
> -----------------------------------------------------------------------------------
>
> Key: LOG4J2-2676
> URL: https://issues.apache.org/jira/browse/LOG4J2-2676
> Project: Log4j 2
> Issue Type: Improvement
> Components: Plugins
> Affects Versions: 2.12.1
> Reporter: Gregg Donovan
> Priority: Minor
> Fix For: 2.13.0
>
>
> PluginProcessor, as of 2.12.1, writes status messages to System.out. This
> breaks using the Log4J annotation processor with Bazel, as it expects those
> messages to be sent to javax.annotation.processing.Messager. PluginProcessor
> on master uses Messager. This ticket is to track backporting just that change
> to either 2.12.2 or 2.13.0, whatever makes the most sense.
> See [this
> discussion|https://lists.apache.org/thread.html/26501473dc123ba907880a6e5baf51cde45311652c3a8beec714d9fb@%3Clog4j-user.logging.apache.org%3E]
> on the mailing list for more context.
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