How to use CDI in WebService?

I am trying to inject a @Injection ed bean into a WebService , but the bean is always null.

Dependency injection is working on my project. When I use @Injection inside a Managebean for a jsp page everything is ok.

@WebService
public class listaUsuariosWS {
    @Inject private LoginService loginService;
    public String getName(){
        List<Usuario> lst = loginService.listarTodos();
        Usuario u = lst.get(1);
        String nome = u.getNomeUsuario();
        return nome;
    }
}

Any idea what it could be?