Java Programming

Here is my code, I can't get the lockFile to delete, any ideas?

FILE 1

  public static final File lockFile = new File("c:/fileLock"); 
    public static FileLock lock = null;

    public void aR()
    {
        try
        {
            FileChannel channel = new RandomAccessFile(lockFile, "rw").
                                  getChannel();
            try
            {
                lock = channel.tryLock();
                if (lock == null)
                {
                    System.exit(0);
                }
            } catch (OverlappingFileLockException e)
            {
            }
        } catch (Exception e)
        {
        }
    }

FILE 2

  public void clean()     {
        try
        {
            manager.lock.release();
        } catch (IOException ioe)
        {}
        manager.lockFile.delete();
    }

Message was edited by:
javarob