openshift + spring websocket - spring

Question

I'm new to openshift and currently trying to set up my websocket application there, but have some issues. While I'm trying to connect to
ws://app-domain.rhcloud.com:8000/path
I get the following exception:
Caused by: java.lang.IllegalArgumentException: No 'javax.websocket.server.Server Container' ServletContext attribute. Are you running in a Servlet container that
supports JSR-356?
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.getContainer(AbstractStandardUpgradeStrategy.java:68)
at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:83)
at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:46)
at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.getSupportedExtensions(AbstractStandardUpgradeStrategy.java:88)
at org.springframework.web.socket.server.support.DefaultHandshakeHandler.doHandshake(DefaultHandshakeHandler.java:214)
at org.springframework.web.socket.server.support.WebSocketHttpRequestHandler.handleRequest(WebSocketHttpRequestHandler.java:127)
... 25 more
When I run application locally everything works fine with the following url:
ws://localhost:8090/path
For both cases I use Tomcat 7.
Spring Config:
<websocket:handlers allowed-origins="*">
<websocket:mapping path="/fight-core" handler="webSocketHandler"/>
<websocket:handshake-interceptors>
<ref bean="webSocketHandshakeInterceptor"/>
</websocket:handshake-interceptors>
</websocket:handlers>
Also I've tried with websocket-api dependency in my pom.xml and w/o it
Kidnly advice

Answer 1

Apparently it's not about Spring nor Tomcat, but Openshift's routing layer; it looks like websocket support is still experimental, see:
* a blog post from 2012 explaining the situation
* Openshift official documentation
For plain WebSocket connections (ws://), requests are directed to port
8000, while WebSocket Secure connections (wss://) use port 8443, as
shown in the following example: http://example.example.com:8000
https://example.example.com:8443