Laurent Goujon created HADOOP-12126:
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Summary: 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
{{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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