Struts 2 Nested Parameter Question

Suppose that I have a list of business primary key numbers and a java Map o开发者_高级运维f OrderId numbers to Orders. How would I retrieve the order object?

Action Form

// assume proper getters and setters and that both objects are initialized
private List<CustomerOrders> orders;
private Map<Integer, Order> orderIdMap;

// JSP

<s:iterator value="orders">
    <s:property value="%{orderIdMap['what_goes_here'].orderDate}" />
</s:iterator>

In the "what_goes_here" blank, I've tried the following:

%{orders.orderId}
%{orderId}
<s:property value="%{orders.orderId}" />
<s:property value='%{orders.orderId}' />

I also tried it without the single quotes before what_goes_here and it didn't work either.

So how do I access the value from the Map using the key which is the current index of the orders list?

Thanks!

---

This is untested but try something like

<s:property value="%{getOrderIdMap().get([0].getOrderId()).getOrderDate()}"/>