You're trying to connect with the userId in your script. You need to connect with the token. I made the same mistake the first time :)
BTW, here's a collaborative whiteboard demo with the channel API : http://goo.gl/F5rb2 Luis On Thu, Dec 16, 2010 at 3:26 AM, Tarun <[email protected]> wrote: > I have been trying to use the newly launched Channel API on SDK 1.4 in > my project. I try to push a message to client which actually pops up a > notification but I am getting the ChannelFailureException. > Here is the code: > TestServlet Where the token is created: > public void doGet(HttpServletRequest req, HttpServletResponse resp) > throws ServletException, IOException { > PrintWriter out = resp.getWriter(); > resp.setContentType("text/html"); > // Creating the userID on the basis of the session id > String userId = req.getSession().getId(); > // Starting the ChannelService of the channel API > ChannelService channelService = ChannelServiceFactory > .getChannelService(); > // Creating the client token > String token = channelService.createChannel(userId); > req.getSession().setAttribute("token", token); > > out.println("<html>"); > out.println("<head>"); > out.println("<title>This is a servlet which will be used to > try the > new Channel API</title>"); > out.println("</head>"); > out.println("<body>"); > out.println("<a href=\"/ChannelAPI.jsp\">Click Here</a> to > recieve a > notification on the next page using channel API"); > out.println("</body>"); > } > } > > Channel API.jsp > <script> > channel = new goog.appengine.Channel('<%= userId%>'); > socket = channel.open(); > //socket.onopen = onOpened; > socket.onmessage = onMessage; > socket.onerror = onError; > socket.onclose = onClose; > onMessage = function (message){ > $.pnotify({ > pnotify_title: 'Regular Notice', > pnotify_text: message.data > }); > }; > > onError = function (description,code){ > $.pnotify({ > pnotify_title: 'Uh Oh!', > pnotify_text: 'something went wrong', > pnotify_type: 'error', > pnotify_hide: false > }); > }; > </script> > > Send Message servlet: > public void doGet(HttpServletRequest req, HttpServletResponse resp) > throws ServletException, IOException { > > String userId = (String) > req.getSession().getAttribute("token"); > ChannelService channelService = > ChannelServiceFactory.getChannelService(); > channelService.sendMessage(new ChannelMessage(userId, > "This is the message that has been sent")); > > } > > } > > The stack trace I got > Uncaught exception from servlet > com.google.appengine.api.channel.ChannelFailureException: An > unexpected error occurred. > at > > com.google.appengine.api.channel.ChannelServiceImpl.sendMessage(ChannelServiceImpl.java: > 59) > > Can you tell me if there is something wrong with the code or with the > Channel API? > > Thanks in advance, > Tarun > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
