GWT RequestFactory. Could not locate setter for property id in type ...ui.server.entity.mc.BasketItem at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator die(ServiceLayerDecorator.java 216)

Hi all, i decided to use GWT Request Factory instead of RPC because of complex type objects in my project. I face this error everytime when i try to remove entity from List. 

public class BasketItem implements Serializable{

    private Integer id;

    private PaymentState paymentState;

    public BasketItem() {

        super();

    }

    public BasketItem(PaymentState paymentState) {

        this.paymentState = paymentState;

    }

    public Integer getId() {

        return id;

    }

    void setId(Integer id) {

        this.id = id;

    }

    public PaymentState getPaymentState() {

        return paymentState;

    }

    public void setPaymentState(PaymentState paymentState) {

        this.paymentState = paymentState;

    }

}

@ProxyFor(value = BasketItem.class)

public interface BasketItemProxy extends ValueProxy {

    public Integer getId();

    public PaymentStateProxy getPaymentState();

}

@Service(value = BasketFacadeRemote.class, locator = BasketFacadeServiceLocator.class)

public interface BasketRequestContext extends RequestContext {

    Request<Integer> registerBasketPayment(PaymentStateProxy payment);

    Request<Boolean> editBasketPayment(BasketItemProxy item);

    Request<Boolean> confirmBasketPayment();

    Request<Boolean> confirmBasketPayment(BasketItemProxy item);

    Request<Boolean> cancelBasketPayment(BasketItemProxy item);

    Request<Boolean> cancelBasketPayment(List<BasketItemProxy> items);

    Request<List<BasketItemProxy>> getBasketListItems();

    Request<BasketProxy> getBasket();

}

public interface BasketFacadeRemote {

    Integer registerBasketPayment(PaymentState payment);

    Boolean editBasketPayment(BasketItem item);

    Boolean confirmBasketPayment();

    Boolean confirmBasketPayment(BasketItem item);

    Boolean cancelBasketPayment(BasketItem item);

    Boolean cancelBasketPayment(List<BasketItem> items);

    List<BasketItem> getBasketListItems();

    Basket getBasket();

}

Here is a snippet of code where I try to call cancelBasketPayment method, and here I cath this error :

 final BasketRequestContext basketRequestContext = EntityService.get().getBasketRequestContext();

                      ArrayList<BasketItemProxy> removeList = new ArrayList<BasketItemProxy>();

                      for (BasketItemProxy bi : PaymentsBasketLayout.getDgSelectionModel().getSelectedSet()) {

                          removeList.add(RequestFactoryUtil.cloneProxy(BasketItemProxy.class, bi, basketRequestContext));

                      }

                      basketRequestContext.cancelBasketPayment(removeList).fire(new CustomReceiver<Boolean>() {

                          @Override

                          public void onSuccess(Boolean response) {

                             // PROCESS

                                      

                                  }

            

Please help...

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