Error in c.vaadin.base.devserver.BrowserLauncher

General
1

I just saw that in the console of a newly create projet from https://start.spring.io

c.vaadin.base.devserver.BrowserLauncher : Application started at http://localhost:null/

After restart the browser no longer opens anymore.

2

The null port could be because server.port is not defined in application.properties, since it is retrieved using app.getEnvironment().getProperty("server.port"). It looks like a bug in DevModeBrowserLauncher; a default value should be used if the setting cannot be found.

About the browser not opening on restart, I suppose this is expected. When BrowserLauncher opens the browser, it also writes a tab.launch file in the build folder (e.g. target for maven projects) and on restart it does not try to open the browser again until a configurable number of minutes (Configuration | Spring | Integrations | Flow | Vaadin Docs).

Was the browser opened on first start? Or not at all?

3

Hi @marcoc_753

thanks for the explanation of the default behavior with the tab.lauch. Didn’t know about that.
Yes, the browser opened on the first start.
I very often close the browser tab (call me old school) and so this behavior is kind of annoying.

I’ll file a bug report about the default value

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4

I guess that if you set vaadin.launch-browser-delay = 0, it should open a new tab at every restart

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6

Let’s hope this fix is effective once it gets released. fix: Use 8080 as the default launch port for opening the browser by Artur- · Pull Request #19833 · vaadin/flow · GitHub

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