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Код

File file = new File(dirResource);
WatchService watcher = null;
Path path = file.toPath();
WatchKey key = null;
try {
    watcher = FileSystems.getDefault().newWatchService();
    updateFileInList(listArray(dirResource), erasePath(dirResource + "/"));

    key = path.register(watcher,
        StandardWatchEventKinds.ENTRY_CREATE,
        StandardWatchEventKinds.ENTRY_DELETE,
        StandardWatchEventKinds.ENTRY_MODIFY);
    } catch (IOException e) {
            ...
    }

    try {
        while (true) {
            WatchKey watchKey = null;
            if (watcher != null) {
                watchKey = watcher.take();
            }
            if (watchKey != null) {
                for (WatchEvent<?> watchEvent : watchKey.pollEvents()) {
                    WatchEvent.Kind kind = watchEvent.kind();
                    if (kind == StandardWatchEventKinds.OVERFLOW) {
                        System.out.println("##### OVERFLOW IN WatcherService!!!");
                        continue;
                    }

                    ............


                    }
                    watchKey.reset();
                }
            }
        } catch (InterruptedException e) {
            .............
        }