docs: private final void openRAF()
      throws LockFile.UnexpectedFileNotFoundException,
             LockFile.FileSecurityException {
  
          try {
              raf = new RandomAccessFile(file, "rw");
          } catch (SecurityException ex) {
              throw new FileSecurityException(this, "openRAF", ex);
          } catch (FileNotFoundException ex) {
              throw new UnexpectedFileNotFoundException(this, "openRAF", ex);
          }
      }