Printing out XSLT transformed XML document in Java Servlet

I am trying to print out a transformed XML document using a Java Servlet (GlassFish Server). I am getting the xml from an external website, transforming it with XSLT, and then trying to print out the transformed document. I believe the the XSL file is correct and is performing a valid transformation.

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.*;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.Result;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;

/**
 *
 * @author Kirie
 */
public class getArticles extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, TransformerConfigurationException, TransformerException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {


            // get the xsl stored in this project 
            ServletContext context = getServletContext();                       
            InputStream xsl = (InputStream)
                                (context.getResourceAsStream("/XSLTransformerCode.xsl"));

            // We need two source objects and one result
            // get an external xml document using a url in a 
            // string format
            String topic = request.getParameter("topic");
            String urlAsString = "";
            if(topic.equals("Business"))
                urlAsString = "http://ift.tt/1vDH79i";
            else if(topic.equals("Technology"))
                urlAsString = "http://ift.tt/1ap2UqG";
            else if(topic.equals("World"))
                urlAsString = "http://ift.tt/1o9GOtg";

            Source xmlDoc =  new StreamSource(urlAsString);
            Source xslDoc =  new StreamSource(xsl);
            Result result =  new StreamResult(out);         

            // Prepare to transform 


            // The transformed document is returned to the browser.
           TransformerFactory factory = TransformerFactory.newInstance();
            Transformer trans = factory.newTransformer(xslDoc);
            trans.transform(xmlDoc,result);

            out.println(result.toString());

        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (TransformerException ex) {
            Logger.getLogger(getArticles.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (TransformerException ex) {
            Logger.getLogger(getArticles.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

This is the servlet that is performing the translation. You can visit the XML documents from the URL specified above. They are RSS feeds.

 <?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet  version="1.0"
  xmlns:xsl="http://ift.tt/tCZ8VR"
>

  <xsl:output method="xml" 
        omit-xml-declaration="yes"
        doctype-system="http://ift.tt/mOIMeg"
        doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"/>

    <xsl:template match="/">
    <html><head></head>
    <body>
    <h1>News Articles</h1>
    <ul>
        <xsl:for-each select = "catalog/item">
        <li>
            <xsl:value-of select = "title"/>
        </li>
        </xsl:for-each>
    </ul>
    </body>
    </html>
</xsl:template>
</xsl:stylesheet>

This is the XSL file I am using to transform the file. Unfortunately, I do not know where the problem is. I have tried to figure things out, but I can't seem to do that. Any input will be helpful and appreciated. I'll be online for awhile so I will be able to answer questions!

Thanks in advance! Kirie