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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13398) prevent user classes from loading classes in the parent classpath with ApplicationClassLoader
Date Wed, 23 Nov 2016 00:54:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sangjin Lee updated HADOOP-13398:
---------------------------------
    Attachment: HADOOP-13398-HADOOP-13070.01.patch

v.1 patch posted for review. This is still a POC quality. It handles classloading and resource
loading. But unit tests are not written yet. I also didn't test {{ServiceLoader}}.

> 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
>
>
> 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 (and as a corollary {{ServiceLoader}}).



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