Spring Boot devtools reload is broken with Vaadin 13

[marcushellberg]

Setup:
Starter downloaded from vaadin.com/start, vaadin.version=13.0.1
Java 11

App

@Route
public class MainView extends VerticalLayout {

    public MainView() {
        add(new H1("hello world"));
    }
}

Problem description
Changing the app, Hello world -> Hello foo reloads OK once. On subsequent changes, the browser shows the following error message:

Could not navigate to ''
Reason: Couldn't find route for ''

Available routes:
This detailed message is only shown when running in development mode.

This error message persists even if you restart the server.

The only way to get rid of the error message that I could find was to clear the browser cookies.

[ZheSun88]

It looks this is a bug when run the project with Java 11 only. I could not reproduce it with JDK 1.8.

[pleku]

We should take a look at this after vaadin/flow#7068 to make sure that there is no Java 11 specific issues

[denis-anisimov]

I can't reproduce this with the latest 14.1.2 Platform skeleton starter flow.
I use Java 11 JDK 11.0.3.

@marcushellberg , could you please check the latest starter version?

[joheriks]

Second that. Seems to work well with 14.1.2 when adding, renaming and removing routes (tested with Java 8 and 12).
vaadin/flow#7070 (comment)

[joheriks]

Closing this issue as it is no longer reproducible.