Vaadin DateField validation does not show validation errors
问题 Hello I'm using Vaadin 8 and im trying to use Vaadins DateField for user input. private DateField date = new DateField("Date of Birth"); ... binder.forField(date).asRequired("Some Warning").withValidator(new DateValidator()).bind(Person::getDateOfBirth, Person::setDateOfBirth); The DateValidator checks if the Person is at least 18 years old. The Problem is that if I use the Datepicker, that is integrated in the DateField no validation error is shown to the user if the Person is younger than