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https://issues.apache.org/jira/browse/FLINK-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14991556#comment-14991556
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Jan Thomä commented on FLINK-2975:
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Thank you very much, seems to be indeed a duplicate of FLINK-2703.
> Exclude logging dependencies from shaded Hadoop jar.
> ----------------------------------------------------
>
> Key: FLINK-2975
> URL: https://issues.apache.org/jira/browse/FLINK-2975
> Project: Flink
> Issue Type: Improvement
> Components: Build System
> Affects Versions: 0.9.1
> Reporter: Jan Thomä
>
> The shaded hadoop jar has Log4j included. Therefore when you try to use flink
> with logback/slf4j logging you will get warnings like:
> ```
> log4j:WARN No appenders could be found for logger
> (kafka.consumer.SimpleConsumer).
> log4j:WARN Please initialize the log4j system properly.
> ```
> even when you have the appropriate slf4j bridges in the classpath. I'd
> suggest to exclude the Log4j dependency from the shaded Hadoop jar and then
> let the end user decide on wether he wants to add log4j or a slf4j bridge to
> the classpath.
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