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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13410) RunJar adds the content of the jar twice to the classpath
Date Fri, 22 Jul 2016 23:45:20 GMT
Sangjin Lee created HADOOP-13410:

             Summary: RunJar adds the content of the jar twice to the classpath
                 Key: HADOOP-13410
                 URL: https://issues.apache.org/jira/browse/HADOOP-13410
             Project: Hadoop Common
          Issue Type: Bug
          Components: util
            Reporter: Sangjin Lee

Today when you run a "hadoop jar" command, the jar is unzipped to a temporary location and
gets added to the classloader.

However, the original jar itself is still added to the classpath.
      List<URL> classPath = new ArrayList<>();
      classPath.add(new File(workDir + "/").toURI().toURL());
      classPath.add(new File(workDir, "classes/").toURI().toURL());
      File[] libs = new File(workDir, "lib").listFiles();
      if (libs != null) {
        for (File lib : libs) {

As a result, the contents of the jar are present in the classpath *twice* and are completely
redundant. Although this does not necessarily cause correctness issues, some stricter code
written to require a single presence of files may fail.

I cannot think of a good reason why the jar should be added to the classpath if the unjarred
content was added to it. I think we should remove the jar from the classpath.

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