Vaadin14 (When I launch the application, it is initialized twice)

Vaadin 6 / 7 / 8
1

(java 1.8, vaadin 14,tomcat 9.2)

Hello, i see strange behavior.

When I launch the application, it is initialized twice

At this point, the browser has no open tabs with another instance

Console output:
START
com.zungaapps.odin.MainView@1b2d3d9b
________
START
com.zungaapps.odin.MainView@742333d6
________

Code:

@Route("")
@PWA(name = "Project Base for Vaadin Flow", shortName = "Project Base")
@Push(value = PushMode.AUTOMATIC, transport = Transport.WEBSOCKET_XHR)

public class MainView extends VerticalLayout {

   public MainView() {
        setSizeFull();
        setPadding(false);
        setMargin(false);
        setSpacing(false);
        setId(MainView.class.getSimpleName());

        System.out.println("START");
        System.out.println(this);
        System.out.println("________");

}
2

Any update on the above issue. I’ve the same behaviour which is very strange.

Факторинг Плюс:
(java 1.8, vaadin 14,tomcat 9.2)

Hello, i see strange behavior.

When I launch the application, it is initialized twice

At this point, the browser has no open tabs with another instance

Console output:
START
com.zungaapps.odin.MainView@1b2d3d9b
________
START
com.zungaapps.odin.MainView@742333d6
________

Code:

@Route("")
@PWA(name = "Project Base for Vaadin Flow", shortName = "Project Base")
@Push(value = PushMode.AUTOMATIC, transport = Transport.WEBSOCKET_XHR)

public class MainView extends VerticalLayout {

   public MainView() {
        setSizeFull();
        setPadding(false);
        setMargin(false);
        setSpacing(false);
        setId(MainView.class.getSimpleName());

        System.out.println("START");
        System.out.println(this);
        System.out.println("________");

}
3

Hi,
I had a similar issue, if I used service worker (pwa, installed as an app) and changed the port where application deployed on tomcat.
After unregistering the old service worker (chrome => F12 => tab Application => Service Workers => Right window) the problem was solved.

Maybe it helps…

4

It worked thank you for the solution.