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https://issues.apache.org/jira/browse/SOLR-2303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120242#comment-13120242
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Uwe Schindler commented on SOLR-2303:
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In all cases!!! And the Maven POMs should also not reference them!
Uwe-State-Machine
> remove unnecessary (and problematic) log4j jars in contribs
> -----------------------------------------------------------
>
> Key: SOLR-2303
> URL: https://issues.apache.org/jira/browse/SOLR-2303
> Project: Solr
> Issue Type: Improvement
> Components: Build
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: SOLR-2303.patch
>
>
> In solr 4.0 there is log4j-over-slf4j.
> But if you have log4j jars also in the classpath (e.g. contrib/extraction,
> contrib/clustering) you can get strange errors such as:
> java.lang.NoSuchMethodError: org.apache.log4j.Logger.setAdditivity(Z)V
> So I think we should remove the log4j jars in these contribs, all tests pass
> with them removed.
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