How to combine JSR-303 and Spring Validator class in a service layer? - spring

Question

I have some model class
public class Account {
#Email
private String email;
#NotNull
private String rule;
}
and spring-validator
public class AccountValidator implements Validator {
#Override
public boolean supports(Class aClass) {
return Account.class.equals(aClass);
}
#Override
public void validate(Object obj, Errors errors) {
Account account = (Account) obj;
ValidationUtils.rejectIfEmpty(errors, "email", "email.required");
ValidationUtils.rejectIfEmpty(errors, "rule", "rule.required");
complexValidateRule(account.getRule(), errors);
}
private void complexValidateRule(String rule, Errors errors) {
// ...
}
}
I run in my service
AccountValidator validator = new AccountValidator();
Errors errors = new BeanPropertyBindingResult(account, "account");
validator.validate(account, errors);
Can I add to my validation process constraints #Email, #NotNull (JSR-303) and don't describe these rules in AccountValidator?
I know how works #Valid in spring-controllers, but what's about service layer? Is it possible? How to do such kind of validation in a proper way? May I should use Hibernate Validator?

Answer 1

Spring provides an Adapter to merge both validation APIs.
See the current Spring JavaDoc for more information.
An possible implementation would be
public class AccountValidator implements Validator {
private final SpringValidatorAdapter validator;
public AccountValidator(SpringValidatorAdapter validator) {
super();
this.validator = validator;
}
#Override
public boolean supports(Class aClass) {
return Account.class.equals(aClass);
}
#Override
public void validate(Object obj, Errors errors) {
//jsr303
validator.validate(obj, errors);
//custom rules
Account account = (Account) obj;
complexValidateRule(account.getRule(), errors);
}
private void complexValidateRule(String rule, Errors errors) {
// ...
}
}