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https://issues.apache.org/jira/browse/HADOOP-10288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883424#comment-13883424
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Todd Lipcon commented on HADOOP-10288:
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I got word from the affected project that this patch fixed their test build.
I'll commit it momentarily.
> Explicit reference to Log4JLogger breaks non-log4j users
> --------------------------------------------------------
>
> Key: HADOOP-10288
> URL: https://issues.apache.org/jira/browse/HADOOP-10288
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Affects Versions: 2.4.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-10288.txt
>
>
> In HttpRequestLog, we make an explicit reference to the Log4JLogger class for
> an instanceof check. If the log4j implementation isn't actually on the
> classpath, the instanceof check throws NoClassDefFoundError instead of
> returning false. This means that dependent projects that don't use log4j can
> no longer embed HttpServer -- typically this is an issue when they use
> MiniDFSCluster as part of their testing.
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