Vaadin push and another websocket server in same webapp

Should Vaadin application with push websocket transport be able to co-exist with other websocket servlets in the same web app?

I tried with Vaadin 8.6.3 and Jetty 9.4.14 (see attached zip).

When connecting to the other websocket I get a “Communication problem” message from Vaadin instead of connecting to an instance of my own websocket class. (35 KB)

There is a known limitation with Atmosphere that WebSockets does not work with more than one servlet mapping. This means that the first one will get WebSockets and the rest will fallback to Long Polling.