EmailValidator doesn't pass on an empty string

Vaadin 14.1.19. I have the following code:

binder.forField(new TextField()).withValidator(new EmailValidator()).bind("field");

However, the validator marks an empty TextField as invalid, effectively disabling the possibility to have an optional email.

Certainly I can hook a converter before the validator which converts empty string to null and vice versa (it’s required anyway because of TextField rejecting nulls), but I wonder whether EmailValidator should pass blank strings?

[denis-anisimov]

I suggest to overload EmailValidator CTOR with a boolean value which says whether an empty value should be accepted or not. That will keep binary compatibility and won’t require introducing a new class.

[Artur-]

new EmailValidator() {
protected boolean isValid(String value) {
if ("".equals(value)) return true;
return super.isValid(value);
}
}