import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.twilio.twiml.voice.Play; import com.twilio.twiml.voice.VoiceResponse; @WebServlet("/answer") public class AnswerServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { VoiceResponse twiml = new VoiceResponse.Builder() .play(new Play.Builder("https://demo.twilio.com/docs/classic.mp3").build()) .build(); response.setContentType("text/xml"); response.getWriter().print(twiml.toXml()); } }