package my.books;

import java.io.File;
import java.net.URI;
import java.util.Properties;
import java.util.logging.Logger;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class App {

    private static final Logger LOG = Logger.getLogger(App.class.getName());
    private Properties properties = new Properties();

    public static void main(String[] args) throws Exception {
        new App().basicJSoup();
    }

    private void basicJSoup() throws Exception {
        properties.loadFromXML(App.class.getResourceAsStream("/properties.xml"));
        LOG.fine(properties.toString());
        URI inputURI = new URI(properties.getProperty("html_input"));
   //     URI outputURI = new URI(properties.getProperty("output"));

        File input = new File(inputURI);
        Document doc = Jsoup.parse(input, "UTF-8");
        Elements sideCategory = doc.select("div.side_categories");
        //  Elements links = doc.select("div.side_categories ul li a");
        iterate(sideCategory);
    }

    private void iterate(Elements elements) {
        Element element = null;
        for (int i = 0; i < elements.size(); i++) {
            element = elements.get(i);
            iterate(element);
        }
    }

    private void iterate(Element element) {
        Elements elements = element.getAllElements();
        iterate(elements);
    }
}

thufir@dur:~/NetBeansProjects/books$
thufir@dur:~/NetBeansProjects/books$ gradle run

> Task :run FAILED
Exception in thread "main" java.lang.StackOverflowError
        at org.jsoup.select.Collector.collect(Collector.java:27)
        at org.jsoup.nodes.Element.getAllElements(Element.java:1011)
        at my.books.App.iterate(App.java:43)