¿Por qué SessionFactory es nulo en concreteDAO cuando se inyectó en AbstractDAO durante junit?

I have unit test to test hibernate process let me go through this

Below is my AbstractDAO

public abstract class BaseDAO {

    protected JdbcTemplate jdbcTemplate;
    protected SessionFactory sessionFactory;
    protected NamedParameterJdbcTemplate namedParameterJdbcTemplate;

    ...

    @Autowired
    public void setDataSource(DataSource dataSource) {
        this.jdbcTemplate = new JdbcTemplate(dataSource);
        this.namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
    }

    @Autowired
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
}

Here is my concreteDAO where it extends BaseDAO

public class LoginDAO extends BaseDAO implements InitializingBean {

    private static final Logger log = Logger.getLogger(LoginDAO.class);
    private MD5PasswordEncoder passwordEncoder;
    private SaltSource saltSource;

    public User getLoggedinUserByUserid(Long userid){
        log.info("in getLoggedinUserByUserid"); 
        User result = null;
        Session session = sessionFactory.openSession();

        try {
            session.beginTransaction();

            result = (User) session.get(User.class, userid);

            session.getTransaction().rollback();
            session.close();

        } catch (Exception e) {
            log.error(e,e);

            session.getTransaction().rollback();
            session.close();
        }

        return result;
    }

...
}

here is my junit

@Test
public void shouldReturnCorrectlyUserWhenCallingGetLoggedinUserByUseridMethod() {

    // Given When
    User adminUser = loginDAO.getLoggedinUserByUserid(1l);

    // Then
    assertNotNull(adminUser);
    assertEquals("sadmin", adminUser.getUsername());
    assertEquals("ecedee8662a0bcd15c157e5734056ac5", adminUser.getPassword());
    assertEquals(1, adminUser.getStatus());
    assertEquals("TS", adminUser.getFirstname());
    assertEquals("Sys Admin Person", adminUser.getLastname());
    assertEquals(0, adminUser.getIdType());
    assertTrue(adminUser.getEnabled());
    assertTrue(adminUser.getAuthenLocal());
    assertTrue(StringUtils.isBlank(adminUser.getTitle()));
}

the SessionFactory was injected alright in the BaseDAO,but when it came to Session session = sessionFactory.openSession(); in LoginDAO, it became null!

How could this happen? need some explanation and How do I fix this problem?