ServerEnpoint change port

I would like to set the port number of my serverEnPoint.

Here is my server socket:

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;

@ServerEndpoint("/myEndPoint")
public class MyEndPoint {

    private static Session session;

    @OnOpen
    public void onOpen(Session s) throws IOException {
        session = s;
    }

    @OnMessage
    public String echo(String message) {
        return message + " (from your server)";
    }

    @OnError
    public void onError(Throwable t) {
        t.printStackTrace();
    }

    public static void sendMessage(String message){
        try {
            session.getBasicRemote().sendText(message);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

I ask how to do that because my server needs to open a websocket but still allow REST API. I am assuming that the websocket port by default is the same as REST and this is why my client does not connect. If you have other solution let me know.

Thanks