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From "Nadeem Douba (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12406) AbstractMapWritable.readFields throws ClassNotFoundException with custom writables
Date Sat, 12 Sep 2015 07:09:45 GMT
Nadeem Douba created HADOOP-12406:

             Summary: AbstractMapWritable.readFields throws ClassNotFoundException with custom
                 Key: HADOOP-12406
                 URL: https://issues.apache.org/jira/browse/HADOOP-12406
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 2.7.1
         Environment: Ubuntu Linux 14.04 LTS amd64

            Reporter: Nadeem Douba
            Priority: Blocker
             Fix For: 2.7.1

Note: I am not an expert at JAVA, Class loaders, or Hadoop. I am just a hacker. My solution
might be entirely wrong.

AbstractMapWritable.readFields throws a ClassNotFoundException when reading custom writables.
Debugging the job using remote debugging in IntelliJ revealed that the class loader being
used in Class.forName() is different than that used by the Thread's current context (Thread.currentThread().getContextClassLoader()).
The class path for the system class loader does not include the libraries of the job jar.
However, the class path for the context class loader does. The proposed patch changes the
class loading mechanism in readFields to use the Thread's context class loader instead of
the system's default class loader.

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