DWR - Null Classes

Dear

I'm having trouble inject classes by calling some methods using DWR with Hibernate.

Code:

@Controller
@Transactional
public class ManterArvoreClassificacaoController {

    @Autowired
    private ArvoreClassificacaoService acs;

    @Autowired
    private AreaArvoreClassificacaoService aacs;

    @Autowired
    private AreaService areaService;

    @Autowired
    private ArvoreSubClassificacaoService ascs;




    public List<ArvoreClassificacao> listarArvoresArea(Area area) {
        return acs.listarArvoresArea(area);
    }