public class User {
private String username;
private String password;
}
public class UserValidator {
public void validate(User user) {
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (!violations.isEmpty()) {
throw new ValidationException(violations.toString());
}
}
}
public class Application {
public static void main(String[] args) {
User user = new User();
UserValidator validator = new UserValidator();
try {
validator.validate(user);
} catch (ValidationException e) {
System.out.println(e.getMessage());
}
}
}
