EDIT

import org.springframework.core.env.Environment;

import org.vaadin.spring.events.EventBus;

import com.vaadin.navigator.View;

import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;

import com.vaadin.spring.annotation.SpringView;

        password1Field.setRequired(true);

        password2Field.setRequired(true);

        password1Field.addValidator(new PasswordsPolicyValidator());

        password2Field.addValidator(new PasswordsMatchValidator("The passwords are not identical.", password1Field, password2Field));

        password1Field.addValueChangeListener(e -> updateResetButtonState());