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KAFKA-21115: Bump slf4j to 2.0.19 and migrate log4j-slf4j-impl to log4j-slf4j2-impl - #23501

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@egyedt

@egyedt egyedt commented Sep 17, 2026

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Reviewers: Viktor Somogyi-Vass viktorsomogyi@gmail.com

…4j-slf4j2-impl

Signed-off-by: Tamás Barnabás Egyed <egyed.t@cloudera.com>
@github-actions github-actions Bot added triage PRs from the community dependencies Pull requests that update a dependency file build Gradle build or GitHub Actions small Small PRs labels Sep 17, 2026
@egyedt

egyedt commented Sep 18, 2026

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@viktorsomogyi
Could you please take a look?

@viktorsomogyi

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@egyedt thanks for asking me to review this, however at this time I unfortunately can't merge it. Upgrading to slf4j2 would break the logger bindings and there is KIP-1064 about this where the community decided to postpone this until Kafka 5:

https://lists.apache.org/thread/z05rlzbjv89rpvzjmzsr8v4w17qn21r1
https://lists.apache.org/thread/f753ghgvcw860sc8znvhkyvg8scnkm0n

@viktorsomogyi

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I would be in favor of a 5.0 release sometime soonish, after 4.4-4.5 though.

@egyedt

egyedt commented Sep 18, 2026

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thanks for letting me know @viktorsomogyi!

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