@Autowired bean null in ConstraintValidator when invoked by Sessionfactory.getCurrentSession.merge

Question

I have just implemented Bean Validation with Hibernate.

If I call the validator explicitly it works as expected and my @Autowired DAO bean that connects to the DB is inj

Answer 1

You can use the following method provided by Spring framework since 2.5.1

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

it's much cleaner since you don't have to set any listener/property across your application.

You code will look like this:

public class ValidUniqueUserEmailValidator implements ConstraintValidator, Serializable {

    private static final long serialVersionUID = 1L;

    @Autowired
    private UserDAO userDAO;

    @Override
    public void initialize(ValidUniqueUserEmail constraintAnnotation) {
        SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);
    }

    @Override
    public boolean isValid(Object value, ConstraintValidatorContext context) {
        boolean isValid = true;
        if (value instanceof String) {
            String email = value.toString();
            if (email == null || email.equals("")) {
                isValid = false;
            }else{
                User user = new User();
                user.setEmail(email);
                isValid = (userDAO.countByEmail(user) > 0);
            }
        }
        return isValid;

    }

}

Hope it helps you guys out