Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package contact.form; import contact.form.Address; import contact.form.Contact; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import org.springframework.validation.Validator; /** * * @author daniel */ public class ContactValidator implements Validator { @Override public boolean supports(Class<?> clazz) { return (Contact.class.equals(clazz) || Address.class.equals(clazz)); } @Override public void validate(Object target, Errors errors) { if (target instanceof Contact) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "firstname", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "lastname", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "telephone", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "address.street", "field.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "address.postalcode", "field.required"); } } }