Change WebSockets code to take Session as a parameter #14
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Just tidying up to use what seems to be the more standard way of accessing the session by taking it as a parameter instead of storing it as an instance variable:
"and an optional Session parameter"
https://docs.oracle.com/javaee/7/api/javax/websocket/OnMessage.html
"optional Session parameter"
https://docs.oracle.com/javaee/7/api/javax/websocket/OnError.html
It's not immediately clear that it's safe to store per-session data as instance variables in the ServerEndpoint: https://docs.oracle.com/javaee/7/api/javax/websocket/server/ServerEndpoint.html
Tested this change and it works.