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 mylife.validator; import java.util.logging.Logger; import mylife.objects.user; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import org.springframework.validation.Validator; /** * * @author johna */ public class userValidator implements Validator { private static final Logger logger = Logger.getLogger(userValidator.class.getName()); @Override public boolean supports(Class<?> clazz) { return user.class.isAssignableFrom(clazz); } @Override public void validate(Object target, Errors errors) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "username", "user.username.required"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "user.password.required"); } }