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

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.

CodePudding user response：

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

CodePudding user response：

I managed to do it this way:

@Tag(Tag.DIV)
@DefaultErrorHandler
public class MYNoRouteHandler extends RouteNotFoundError {

private static final long serialVersionUID = 7169334501543395112L;
private static final Logger log = LoggerFactory.getLogger(MyNoRouteHandler.class);

@Override
public int setErrorParameter(BeforeEnterEvent event, ErrorParameter<NotFoundException> parameter) {
    log.debug("Not existing view requested with name: /"   event.getLocation().getPath());
    log.debug("Redirect user to /start");
    event.forwardTo(StartView.class);
    return HttpServletResponse.SC_NOT_FOUND;
    }
}

Thanks one more time for helping me out. Sometimes i wonder why others did not ask. Maybe they read the manual?