I need to implement a fairly simple WebSocket server in Java SE. All it needs to do is accept connections and store the respective sessions, then send a message to all connected client whenever a certain event is fired.
I cannot find a single tutorial for how to do this in regular Java SE. All of them require running with Maven, or deploying it as a WAR - which are all out of the question for this project. I need to run this as a Java SE desktop app.
The tutorials I have found show how to implement an endpoint using annotations like @OnOpen, @OnMessage, and @OnClose. However, none of them explain how to actually initialize the server. I also need to be able to specify a different port number for incoming connections.
Am I missing something? I know people have made chat apps using WebSocket, and that really should not require a web application server. I am not using Maven either, and would prefer to keep it that way for simplicity's sake.
https://github.com/TooTallNate/Java-WebSocket is a full WebSockets server and client implementation in Java SE, no enterprise/web app server needed.