Unable to extract xml data from website using JAVA

Question

I'm trying to extract data for the hotel names at the given latitude and longitude in JAVA. I'm getting the following error: [Fatal Error] :1:1: Content is not allowed in prolog. Here is the code and the URL from where I am trying to extract my information. Any suggestion about the issue?

              URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269"");
              InputStream is = url.openStream();
              DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
              DocumentBuilder db = dbf.newDocumentBuilder();
              Document doc = db.parse(is);

                NodeList itemList = 
                        doc.getElementsByTagName("HotelSummary");
                Node itemNode;
                Element itemElt;


                for(int k=0; k < itemList.getLength(); k++)
                {
                    itemNode = itemList.item(k);

                    if(itemNode.getNodeType() == Node.ELEMENT_NODE) {
                        itemElt = (Element) itemNode;
                        System.out.println("Hotel name: "+itemElt.getElementsByTagName("name").item(0).getTextContent());

Answer 1

What's Going Wrong

If you run the following code, you will see the data you are getting back is not XML, but JSON.

import java.net.URL;
import java.io.InputStream;

public class Demo {

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269");
        InputStream is = url.openStream();

        int next = is.read();
        while(next != -1) {
            System.out.print((char) next);
            next = is.read();
        }
    }

}

Getting the Data as XML

You can use an HttpURLConnection to request the data as XML:

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.InputStream;
import javax.xml.parsers.*;
import org.w3c.dom.Document;

public class Demo {

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269");

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setRequestProperty("Accept", "application/xml");
        InputStream is = connection.getInputStream();

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(is);
    }

}