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https://issues.apache.org/jira/browse/KAFKA-16936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18054591#comment-18054591
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Konrad Windszus commented on KAFKA-16936:
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bq. Will users with log4j 1.x in their distributions still work with slf4j 2.x?
bq. It seems to me the answer is YES.
This is not true for OSGi containers, only some packages are exported in 1.x
version
(https://github.com/qos-ch/slf4j/blob/d2073bece8310017914e1ff65d7107b2d4869c7d/slf4j-api/pom.xml#L63).
Notably missing are {{org.slf4.event}} and {{org.slf4j.spi}} which have
evolved in a non binary compatible way.
> Upgrade slf4j to 2.0.9 and integrate "-Dslf4j.provider" to kafka script
> -----------------------------------------------------------------------
>
> Key: KAFKA-16936
> URL: https://issues.apache.org/jira/browse/KAFKA-16936
> Project: Kafka
> Issue Type: New Feature
> Reporter: Chia-Ping Tsai
> Assignee: TengYao Chi
> Priority: Major
> Labels: need-kip
>
> origin discussion:
> [https://github.com/apache/kafka/pull/16260#issuecomment-2159632052]
> The specific provider class can be defined by `slf4j.provider`[0]. Hence, we
> can add the slf4j backends we care about to dependencies. With that, our
> distributions will have different slf4j backends and it is safe as we will
> define slf4j.provider in our script. Also, those slf4j backends will be
> collected to "dependend-libs", and hence we can run kafka instance from
> source code with specific provider too.
> In short, the following tasks are included by this jira
> 1. upgrade slf4j from 1.7.36 to 2.0.9+
> 2. add a new system variable to script to define -Dslf4j.provider easily. By
> default we use org.slf4j.reload4j.Reload4jServiceProvider
> 3. add other slf4j backend dependencies (optional)
> This change needs KIP since slf4j requires the version match between the
> provider and slf4j-api.jar. Hence, users may encounter compatibility issue if
> they have added other providers jar into kafka classpath.
> [0] https://www.slf4j.org/manual.html
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