URL ref = new URL(url.getPath()); if (!new File(ref.getFile()).exists())
File file = new File(url.getPath().substring(5)); URL ref = file.toURL(); if (!file.exists())
	public synchronized void connect() throws IOException {		if (!connected) {			URL ref = new URL(url.getPath());			if (!new File(ref.getFile()).exists())				throw new FileNotFoundException();			reference = ref;		}	}