/** Stop de applicatie. */
 public static void shutdown() {
   logger.info("Stoppen van de applicatie");
   for (DirectoryWatcher watcher : WATCHERS) {
     watcher.stop();
   }
   MessageSender.getInstance().shutdown();
 }
 /** Start de applicatie. */
 private static void startup() {
   for (DirectoryWatcher watcher : WATCHERS) {
     watcher.start();
   }
 }