java - 如何在动作Struts2 REST Annotation之间传递动态值？

Question

订单在 PaymentController 中生成，然后发送到ThankyouController

@Results({
    @Result(name="create",  type="redirectAction", 
            params = {"actionName" , "thankyou", "order", "${order}"})
})
public class PaymentController {
    private Order order;

    public Order getOrder()
        return order;

    public void setOrder(Order order)
        this.order = order;

    public String create()
        order = generateOrder();
        return "create";
}



public class ThankyouController
    private Order order;

    public HttpHeaders index()
    {
        System.out.println("---------------------" + order + "-----------------------------");
        return new DefaultHttpHeaders("index").withStatus(200);
    }

    public Order getOrder()
        return order;

    public void setOrder(Order order)
        this.order = order;

但由于某些原因，我不断在ThankyouController 中获得Null 值。

谁能建议我在不使用 session 的情况下在动作之间传递价值的正确方法？