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

Ivan Published at Dev

Ivan

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?

matthias

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) {
      // ...
  }
}

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