[classlib][nio][compatibility] Harmony doesn't support to call FileLock.release by reflection.

[Andrew Zhang]

Hi folks,

Harmony doesn't support to call FileLock.release by reflection. Following
test case shows the problem. The failure reason is that our implementation
class FileLockImpl is not public. A jira issue (
https://issues.apache.org/jira/browse/HARMONY-3743) is filed. Shall we fix
it for compatibility reason? Thanks!

public void testRelease() throws Exception {
       File f = File.createTempFile("nio", "tmp");
       RandomAccessFile raf = new RandomAccessFile(f, "rw");
       FileChannel fc = raf.getChannel();
       FileLock lock = fc.lock();
       Method releaseMethod = lock.getClass().getMethod("release",
               (Class[]) null);
       releaseMethod.invoke(lock, (Object[]) null);
   }

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Best regards,
Andrew Zhang