Vaadin 23 : There was an exception while trying to navigate to 'login'

There was an exception while trying to navigate to ‘login’ with the root cause ‘java.lang.NullPointerException: Cannot invoke “java.util.ResourceBundle.getString(String)” because the return value of “java.util.Map.get(Object)” is null’

If your resource bundle doesn’t return a value - this happens.

So you’re possibly trying to localize something in the login view but missing that particular localization key or file