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https://issues.apache.org/jira/browse/FLINK-5339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947772#comment-15947772
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Matt Sicker commented on FLINK-5339:
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Any help wanted from Log4j here? I was looking into this library for work and
noticed it uses log4j 1.2 by default which is EOL and doesn't work with Java 9+
(see [this
announcement|https://blogs.apache.org/logging/entry/moving_on_to_log4j_2]). See
also LOG4J2-1473 where we're tracking various Apache project upgrades.
In particular, if there are any features from 1.x that we haven't ported to 2.x
yet, we'd like to know as that has been a pain point in migration for some
other projects that try to do fancy things with the logging system.
> Ensure Flink works with Log4j version 2
> ---------------------------------------
>
> Key: FLINK-5339
> URL: https://issues.apache.org/jira/browse/FLINK-5339
> Project: Flink
> Issue Type: Improvement
> Components: Build System, Documentation
> Reporter: Robert Metzger
> Assignee: Robert Metzger
>
> Flink supports using different logging backends.
> We currently use Log4j 1.2 by default and there is a documentation page for
> using Flink with Logback.
> With this JIRA, I would like to make all required changes to support Log4j 2
> and document how users can set up Flink to use that logging backend.
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