FULL PRODUCT VERSION :
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Given:

package uapiImpl;

public interface MediaFileReader extends AudioSource
{
  public static class Mode
  {
  }
}

public class MediaFileReaderImpl implements MediaFileReader
{
  private native void SetReadingModeProxy(Mode mode);
}

javah produces:

/*
 * Class: uapiImpl_MediaFileReaderImpl
 * Method: SetReadingModeProxy
 * Signature: (Luapi/MediaFileReader/Mode;)V
 */

notice that Signature reads "(Luapi/MediaFileReader/Mode;)V" instead of "(Luapi/MediaFileReader$Mode;)V"

It is screwing up the dollar-sign for some reason. If you use FindClass() against the signature it generates it will result in a failure.


REPRODUCIBILITY :
This bug can be reproduced always.