WebSockets on DIY cartridge on OpenShift - websocket

Question

I'm trying to build DIY application on OpenShift that implements WebSockets. I started with this example:
https://www.openshift.com/blogs/how-to-build-java-websocket-applications-using-the-jsr-356-api
If I run it locally, it works perfectly. When I upload the code to a DIY OpenShift cartridge and compile it, I get an error. I modified the code so that the Server connects to $OPENSHIFT_DIY_IP on port 8000, but when the code reaches the line server.start(); it crashes with the following error.
What am I doing wrong? I tried other ports (17500 and on) without any luck.
Error:
Binding server to 127.7.177.1:8000
Jun 04, 2014 10:28:02 AM org.glassfish.tyrus.server.ServerContainerFactory create
INFO: Provider class loaded: org.glassfish.tyrus.container.grizzly.GrizzlyEngine
java.net.SocketException: Permission denied
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:444)
at sun.nio.ch.Net.bind(Net.java:436)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.glassfish.grizzly.nio.transport.TCPNIOBindingHandler.bindToChannelAndAddress(TCPNIOBindingHandler.java:131)
at org.glassfish.grizzly.nio.transport.TCPNIOBindingHandler.bind(TCPNIOBindingHandler.java:87)
at org.glassfish.grizzly.nio.transport.TCPNIOBindingHandler.bind(TCPNIOBindingHandler.java:64)
at org.glassfish.grizzly.AbstractBindingHandler.bind(AbstractBindingHandler.java:140)
at org.glassfish.grizzly.AbstractBindingHandler.bind(AbstractBindingHandler.java:159)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.bind(TCPNIOTransport.java:470)
at org.glassfish.grizzly.http.server.NetworkListener.start(NetworkListener.java:658)
at org.glassfish.grizzly.http.server.HttpServer.start(HttpServer.java:264)
at org.glassfish.tyrus.container.grizzly.GrizzlyEngine$1.start(GrizzlyEngine.java:88)
at org.glassfish.tyrus.server.TyrusServerContainer.start(TyrusServerContainer.java:119)
at org.glassfish.tyrus.server.Server.start(Server.java:122)
at org.neo.wordgame.server.WebSocketServer.runServer(WebSocketServer.java:23)
at org.neo.wordgame.server.WebSocketServer.main(WebSocketServer.java:11)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:744)
Please press a key to stop the server.Jun 04, 2014 10:28:04 AM org.glassfish.tyrus.server.Server stop
INFO: Websocket Server stopped.

Answer 1

Your application needs to listen on port 8080 on your $OPENSHIFT_DIY_IP, but you need to connect to it from the outside at http://app-domain.rhcloud.com:8000 or http://app-domain.rhcloud.com:8443 (ssl). Binding to port 8000 on your $OPENSHIFT_DIY_IP won't work.

Answer 2

It is just as developercorey says. Latest news about WebSockets on OpenShift I could find is this blog post, clearly saying that you have to access 8000/8443 from outside.
As a live example, I've deployed application using WebSockets into OpenShift. If you access it using http://vinbudin-openshift.anthavio.net/ui
Although application still works, because it can degrade to long-polling silently,
when you look into Chrome Developer Tool Network Tab, you can see rejected WebSocket upgrade request
Request URL:ws://vinbudin-openshift.anthavio.net/ui/PUSH/?v-uiId=0&v-csrfToken=bcd0c9a6-2a6f-4ddb-8332-7929e4337b2d&X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=2.1.5.vaadin4-jquery&X-Atmosphere-Transport=websocket&X-Atmosphere-TrackMessageSize=true&X-Cache-Date=0&Content-Type=application/json;%20charset=UTF-8&X-atmo-protocol=true
Request Method:GET
Status Code:501 Not Implemented
But using url with port 8000 http://vinbudin-openshift.anthavio.net:8000/ui yields better result
Request URL:ws://vinbudin-openshift.anthavio.net:8000/ui/PUSH/?v-uiId=0&v-csrfToken=bcd0c9a6-2a6f-4ddb-8332-7929e4337b2d&X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=2.1.5.vaadin4-jquery&X-Atmosphere-Transport=websocket&X-Atmosphere-TrackMessageSize=true&X-Cache-Date=0&Content-Type=application/json;%20charset=UTF-8&X-atmo-protocol=true
Request Method:GET
Status Code:101 Switching Protocols