jodd-core/src/main/java/jodd/io/watch/DirWatcher.java
public void start(final long pollingInterval) {
		if (timer == null) {
			if (!startBlank) {
				init();
			}
			timer = new Timer(true);
			timer.schedule(new WatchTask(), 0, pollingInterval);
		}
	}
public void start(final long pollingInterval) {
		if (timer == null) {
			if (!startBlank) {
				init();
			}
			timer = new Timer(true);
			timer.schedule(new WatchTask(), 0, pollingInterval);
		}
	}
Starts the watcher.