Comment utiliser JavaFX et WebSockets dans Java 9 pour implémenter une interface graphique pour la communication en temps réel

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javax.websocket.ClientEndpoint;
import javax.websocket.ContainerProvider;
import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;

@ClientEndpoint
public class RealTimeApplication extends Application {

    private Session session;
    private TextArea messageArea;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Real Time Application");

        VBox vbox = new VBox();

        messageArea = new TextArea();
        messageArea.setEditable(false);

        TextField inputField = new TextField();
        inputField.setOnAction(event -> {
            String message = inputField.getText();
            session.getAsyncRemote().sendText(message);
            inputField.setText("");
        });

        vbox.getChildren().addAll(messageArea, inputField);

        primaryStage.setScene(new Scene(vbox, 400, 300));
        primaryStage.show();

        connect();
    }

    @Override
    public void stop() {
        try {
            session.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @OnMessage
    public void onMessage(String message) {
        messageArea.appendText(message + "
");
    }

    private void connect() {
        try {
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            session = container.connectToServer(this, new URI("ws://localhost:8080/ws"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketTransportRegistration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Configuration
    @EnableWebSocketMessageBroker
    public static class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

        @Override
        public void configureWebSocketTransport(WebSocketTransportRegistration registration) {
            registration.setMessageSizeLimit(1024000);
        }

        @Override
        public void registerStompEndpoints(StompEndpointRegistry registry) {
            registry.addEndpoint("/ws").withSockJS();
        }
    }

    @ServerEndpoint(value = "/ws")
    public static class WebSocketServer {

        @OnMessage
        public void onMessage(Session session, String message) throws IOException, EncodeException {
            for (Session client : session.getOpenSessions()) {
                client.getBasicRemote().sendText(message);
            }
        }
    }
}