RikyTres

Thanks for the answer, but I tried a lot and I wasn't able to do this, then i change way...Now I use WebSocket and everything works fine!

I'm trying to make a XMLHttpRequest from a JavaScript page to a Java Servlet.I found out lots of problem because it's first time that I do this. The main problem it's that the servlet doesn't work!It give me this error:

HTTP Status 500 - Servlet execution threw an exception type: Exception report message: Servlet execution threw an exception description: The server encountered an internal error that prevented it from fulfilling this request. exception: javax.servlet.ServletException: Servlet execution threw an exceptionroot cause java.lang.NoClassDefFoundError: com/google/appengine/api/channel/ChannelServiceFactoryProvaServer.Server.doPost(Server.java:30)javax.servlet.http.HttpServlet.service(HttpServlet.java:647)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)root cause java.lang.ClassNotFoundException: com.google.appengine.api.channel.ChannelServiceFactoryorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)ProvaServer.Server.doPost(Server.java:30)javax.servlet.http.HttpServlet.service(HttpServlet.java:647)javax.servlet.http.HttpServlet.service(HttpServlet.java:728) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.33 logs.

This is the Java Servlet code:

package ProvaServer; import java.lang.Object;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.google.appengine.api.channel.*;import com.google.appengine.api.channel.ChannelServiceFactory; @WebServlet(description = "prova", urlPatterns = { "/provaFinale" })public class Server extends HttpServlet {	  private static final long serialVersionUID = 1L;		 public Server() {		  super();		  // TODO Auto-generated constructor stub	 } 	 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		  String userId = request.getParameter("idUser"); 		  ChannelService channelService = ChannelServiceFactory.getChannelService();      //the problem is here! 		  String token = channelService.createChannel(userId); 		  System.out.println("IdUser:" + userId);  		  System.out.println("Token:" + token); 		  String url="mona.html?user="+userId+"&token="+token;		  response.sendRedirect(url);	 } 	 @Override	 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {}}

and this is the web.xml servlet mapping file:

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">	<display-name>Server</display-name>	<welcome-file-list>		<welcome-file>index.html</welcome-file>	</welcome-file-list>	<servlet>		<servlet-name>ServerServlet</servlet-name>		<servlet-class>ProvaServer.Server</servlet-class>	</servlet>   <servlet-mapping>		<servlet-name>ServerServlet</servlet-name>		<url-pattern>/provaFinale</url-pattern>   </servlet-mapping></web-app>

The problem come out when servlet try to run this code: ChannelService channelService = ChannelServiceFactory.getChannelService() but i can't understand what is the error.Could someone help me to understand? Thanks for the attention!

I keep trying to understand! I found out some problems with JavaScript syntax.Could someone explain me this code portion?

{...var pc1 = new RTCPeerConnection(servers);var pc2 = new RTCPeerConnection(servers);...pc1.createOffer(gotDescription1);	//why is gotDescription1 invoked without any parameter?...} function gotDescription1(desc){  pc1.setLocalDescription(desc);  trace("Offer from pc1 \n" + desc.sdp);  pc2.setRemoteDescription(desc);  pc2.createAnswer(gotDescription2);}

I don't understand what is the values of "desc" parameter in the gotDescription1(desc){}

Since this is so new, it's probably best to just inspect their demo and see what it's doing. You can put a breakpoint on the line where they create the RTCPeerConnection object to see what parameters are being passed to it, for example.

Hi everyone. I need to create a webApp for video call between two computers using a browser without plug-in. I have to use WebRTC to make this. While searching information about this, I found out a lot of exemples and demos, but i don't understand how the connection works.What's kind of parameters I have to pass to RTCPeerConnection() to create a connection between two my computer both in same LAN? Thanks for the help.

Hi everyone! I need help for transforming XML in to XHTML using XSLT. I can do everything i need in XSLT and it works on every Browser except in Google Chrome. I read that this is not a strange thing... Google do this intentionally for keep hight security level... Is this true?Are there something that I can do for resolve this problem?