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GFv4, WebSockets sample app

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not sure whether it's Glassfish or just me: Downloaded the
NetBeans+GFv4 bundle. Followed Aruns pretty good write-up / chat
tutorial [1]. Built. Deployed. Outcome: It's "not working". Not much
more. App deploys, but I neither see any evidence that WebSocket
support is there, nor does the chat application work. It mainly ends up
with a "can't connect to ws://localhost:8080/...".

Found this command...

asadmin set

Command set executed successfully

... somewhere on the 'net, which seems to successfully do "something"
yet it doesn't change much about the result.

Is there anything I should know about that? Anything I can do to at
least track down what's happening here?

TIA and all the best,