Connecting websocket to local application through the application endpoint

I'm trying to create a websocket in java that listens to a local application on the endpoint f.ex. "wss://localhost.localapp.com:8080/".

The application do send through that websocket information about what is happening.

I do have a HTML file and a JavaScript file.

In javascript it is really easy to create the connection with a websocket and get messages from the application.

But in java, I don't get anything through the same websocket. I wonder is there anything I'm missing?

The java file isn't connected to my HTML file in anyway. Do it have to be? I have seen several examples of where the endpoint is almost the same as the url of the webpage, but I only want to connect to the applications endpoint and get information from there.

@ClientEndpoint
public class ClientEndpoint {

private Logger logger = Logger.getLogger(getClass().getName());

public static void main(String args) {
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
try {
container.connectToServer(Client.class, new URI("wss://localhost.localapp.com:8080/"));
} catch (DeploymentException | URISyntaxException | InterruptedException | IOException e) {
System.out.println("Connection error occured!: " + e);
}
}

@OnOpen
public void onOpen(Session session) {
this.logger.info("New websocket session opened: " + session.getId());
}

@OnClose
public void onClose(Session session) {
this.logger.info("Websoket session closed: " + session.getId());
}

@OnMessage
public void onMessage(Session session, String message) throws IOException, EncodeException {
this.logger.info("Message recieved: " + message);
}

@OnError
public void error(Session session, Throwable t) {
t.printStackTrace();
}
}


What else must be done to get the connection to the local application through the websocket?

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