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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12126) Configuration might use ApplicationClassLoader to create XML parser
Date Sat, 27 Jun 2015 22:58:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604410#comment-14604410
] 

Gera Shegalov commented on HADOOP-12126:
----------------------------------------

I agree that loading {{DocumentBuilderFactory}} has to be fixed, however, it should respect
the {{classloader}} instance variable of {{Configuration}} instead of blindly resorting to
{{Configuration.class.getClassloader()}}. By default, the {{classloader}} instance variable
will point to ApplicationClassLoader. Thus we still have a problem that has to be resolved
outside the configuration class in the {{ApplicationClassLoader}} of the app.

> Configuration might use ApplicationClassLoader to create XML parser
> -------------------------------------------------------------------
>
>                 Key: HADOOP-12126
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12126
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>            Reporter: Laurent Goujon
>            Assignee: Laurent Goujon
>         Attachments: HADOOP-12126.001.patch, HADOOP-12126.002.patch, HADOOP-12126.003.patch
>
>
> {{org.apache.hadoop.conf.Configuration}} creates a new DocumentBuilder to parse the XML
config files, but it doesn't specify which classloader to use to discover and instantiate
the XML parser.
> Because DocumentBuilderFactory relies on ServiceProvider, whose by default, uses the
context classloader. If classpath isolation is turned on, one might expect that that Configuration
will only load classes from the system classloader, but it turns out that the context classloader
is set to ApplicationClassLoader, and that a XML parser might be loaded from the user classpath.



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