Getting null session in spring startup class

Question

Follow up to my existing question, I am getting null session factory and hence my transaction is being failed. Here is what my class structure looks like

@Component
public class MyCachingObj extends HibernateMapper{
    @PostConstruct
    public void loadAll() {
        ...
        getCurrentSession().getQuery(); //this method is in HibernateMapper
        ...
    }
}


@Repository
public class HibernateMapper {
    @Autowired
    private SessionFactory _session;

    public Session getCurrentSession() {
        return _session;
    }
}

What I have read so far, that @PostConstruct doesn't guarantee that spring is done with all beans. Then how can i make sure that spring is done processing and i have session ready to be picked up ?

EDIT I ended up creating

@Component
@Transactional
@Repository
public class ApplicationStartup implements ApplicationListener<ContextRefreshedEvent>{..}

which had autowired sessions and autowired another Component class. However, i noticed that this onApplicationEvent method was being called twice. I ended up putting a boolean variable to load the underlying data only once.

Now few questions

1. Why onApplicationEvent is being called twice.
2. My cached object is annotated with @Component, Is it safe to assume that as long as that object is being used by @Autowired instance, it would remain singleton and would hold the data i loaded at startup ?