'circunstances for a Couldn't load manifest attributes exception

I am asking to you for this code from hive-jdbc is failing to me:

private static synchronized void loadManifestAttributes() throws IOException {
    if (manifestAttributes != null) {
      return;
    }
    Class<?> clazz = HiveDriver.class;
    String classContainer = clazz.getProtectionDomain().getCodeSource()
        .getLocation().toString();
    URL manifestUrl = new URL("jar:" + classContainer
        + "!/META-INF/MANIFEST.MF");
    Manifest manifest = new Manifest(manifestUrl.openStream());
    manifestAttributes = manifest.getMainAttributes();
  }

It seems the manifest for the jar is not being accesed correctly.. I wonder under what circunstances this can happen.. I assume this jar file has to have a manifest file since is a driver package. hive-jdbc classes are being loaded so I assume the classContainer is correct.. so How is possible the manifest is failing to be loaded?

Best Regard

Rob

javajarmanifest.mf


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