How to cast Authentication in createAuthentication method security 3.1

[Ronhead]

Hi!

I need to find a way to make a cast to Authentication when the user is guest.
because I need to put other objects like shopcart before login.

anyone know what to do?

my code

public class CustomAnonymousAuthenticationFilter extends  AnonymousAuthenticationFilter{
.
.
.
protected Authentication createAuthentication(final HttpServletRequest request) {
	UsuarioGuest auth = (UsuarioGuest) super.createAuthentication(request);
	return auth;
}

ERROR
java.lang.ClassCastException: org.springframework.security.authentication.Anonym ousAuthenticationToken cannot be cast to cl.work.security.UsuarioGuest

UsuarioGuest Class

public class UsuarioGuest extends AnonymousAuthenticationToken{

	public UsuarioGuest(String key, Object principal, Collection<? extends GrantedAuthority> authorities) {
		super(key, principal, authorities);
	
	}

 
	private static final long serialVersionUID = 2322514539993169503L;
	List<ShoppingCartProductGuestDTO> listShoppCartProduct = new ArrayList();
	

	public List<ShoppingCartProductGuestDTO> getListShoppCartProduct() {
		return listShoppCartProduct;
	}

	public void setListShoppCartProduct(
			List<ShoppingCartProductGuestDTO> listShoppCartProduct) {
		this.listShoppCartProduct = listShoppCartProduct;
	}

 
	

}