[SOLVED] Vaadin catch "Could not navigate to 'route' and redirect to existing route

Vaadin catch "Could not navigate to 'route' and redirect to existing route

I am doing a Vaadin App that has three Views, and whenever the users enters an unknown URL he sees this page:

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

Available routes: app login logout

This detailed message is only shown when running in development mode. I want to define a route instead of showing this page, how to do it? Like whenever this messgage is shown it should just swallow it and redirect to an existing route.

Solution

What you're seeing is the default "not found" error handler. You can define your own error handler by creating a UI component (e.g. VerticalLayout) subclass that implements HasErrorParameter<NotFoundException>. Flow will automatically that class from the application in the same way that it picks up @Route annotated classes.