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https://issues.apache.org/jira/browse/SOLR-2303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983266#action_12983266
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Mark Miller commented on SOLR-2303:
-----------------------------------
Hey Erick,
If I remember right, log4j-over-slf4j is in there for proper zookeeper logging
(hoping they switch to slf4j). Rather than dropping it, we should likely try
and figure out how to keep and fix the issue - as suggested by Robert.
> 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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