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https://issues.apache.org/jira/browse/HADOOP-13398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951309#comment-15951309
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Sangjin Lee commented on HADOOP-13398:
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Ping. Any feedback on this patch is greatly appreciated. Thanks!
> prevent user classes from loading classes in the parent classpath with
> ApplicationClassLoader
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-13398
> URL: https://issues.apache.org/jira/browse/HADOOP-13398
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: util
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Priority: Critical
> Attachments: HADOOP-13398-HADOOP-13070.01.patch,
> HADOOP-13398-HADOOP-13070.02.patch, HADOOP-13398-HADOOP-13070.03.patch,
> HADOOP-13398-HADOOP-13070.04.patch, hadoop-13398-notes.pdf
>
>
> Today, a user class is able to trigger loading a class from Hadoop's
> dependencies, with or without the use of {{ApplicationClassLoader}}, and it
> creates an implicit dependence from users' code on Hadoop's dependencies, and
> as a result dependency conflicts.
> We should modify {{ApplicationClassLoader}} to prevent a user class from
> loading a class from the parent classpath.
> This should also cover resource loading (including
> {{ClassLoader.getResources()}} and as a corollary {{ServiceLoader}}).
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