wsocket = new WebSocket("ws://ADRESA_SERVRA:8080/ADRESA_APLIKACIE/MENO_WEBSOCKET_ENDPOINTU");
    wsocket.onmessage = onMessage;

    function onMessage(evt)
    {
        var data = evt.data.split(";");
	// spracuj data
    }

    ...
    wsocket.send("some message...");


    ...
    wsocket.close(); // ak potrebujeme zatvorit spojenie

import jakarta.websocket.*;
import jakarta.websocket.server.ServerEndpoint;

@ServerEndpoint("/whatever")
public class SomeOurWebsocketServerEndpointClass
{
    // it is possible to inject references to CDI beans (session or application)
    @Inject
    SomeAppOrSessionBean bean;

    @OnOpen
    public void open(Session session, EndpointConfig conf)
    {
        // websocket session allows us to communicate with the other side
    }

    @OnClose
    public void close(Session session, CloseReason reason)
    {
        // if the connection has been closed, we may want to remove it from our datastructures, free resources, etc.
    }

    @OnMessage
    public void processGreeting(String message, Session session) {
        System.out.println("Greeting received:" + message);
        // send some response back to javascript
        sessesion.getBasicRemote().sendText("some message to send back");
    }

    @OnError
    public void onError(Session session, Throwable throwable) {
        // any error handling here
    }