Vaadin with web service

Hi folks!
I’d like to create a Vaadin app that would be notified from a web service.
Example: after the WS got a POST method call, the WS would notify the Vaadin UI about the event.

So my question is: could you please help me with some hints/tutorials/examples like wich libs to use, in what project structure, what kind of server (tomcat, tomee, glassfish etc) to use for the best result.

Thx for your help.