public void scrape(String url) {

    String docUrl = url;

    try {

        Document document = Jsoup.connect(docUrl).get();
        Elements foundUrls = document.select("a[href]");

        System.out.printf("Found %d links. %n", foundUrls.size());

        for (Element  foundUrl : foundUrls) {


            String nextUrl = foundUrl.attr("href");

            if (visitedLinks.contains(nextUrl)) {
                System.out.println("Link already visited. Skipping URL.");
            }

            else {

                System.out.println("Scraping: "+ nextUrl);
                visitedLinks.add(nextUrl);
                scrape(nextUrl);
            }

        }
    } catch (Exception ex) {

        System.out.printf("Could not read %s.%n", url);
    }
}