Java Platform, Enterprise Edition (Java EE) 8
The Java EE Tutorial
You use the
f:websocket tag in a view to allow server-side communications
to be pushed to all instances of a socket containing the same channel name.
When the communication is received, an
event handler can be set that is called whenever a push arrives from the server.
The server side of a WebSocket communication has the ability to push out messages.
You can do this using
javax.faces.push.PushContext, which is an injectable
context, allowing a server push to a named channel.