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
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