Let me explain more.

public class EmailScheduler {

    @Inject
    private Logger                      log;

    @Inject
    private MyDAO                       myDAO;

        @Inject
        EmailService                                    emailService;

        public void deliverEmail(@Observes @AtMidNight Trigger trigger){
           log.info("Scheduled job is triggered");
           Collection<MyObject> = myDAO.findAllObjects();
        }
}

It throws exception when I access MyDAO bean inside this triggered job. Any idea what I am not understanding?

Sebastian,

Thank you so much for your reply, I am copying my MyDAO class here

@Local
public interface MyDAO {

    public Word findRandomWord();
}

import javax.ejb.Stateless;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Stateless
@Named("myDAO")
public class MyDAOBean implements MyDAO {

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public Word findRandomWord() {
        return (Word)entityManager.find(Word.class, 1);
    }
}

I have tried this way too but it is throwing the same exceptions like myDAO object is not getting properly instantiated and throwing connection error.
Though myDAO object works fine if I invoke from any other action and it fetches data from database. It only doesn't work if it is getting used by cron method.