How to pass parameter to method call in Struts 2 OGNL

I want to use a property as a param of an object's method.

<s:property value="orderProductId"开发者_JS百科 />

returns correct value (e.g. 1)

<s:iterator value="%{order.getProductById(1).activations}">

gives me correct value too. But

<s:iterator value="%{order.getProductById(#orderProductId).activations}">

doesn't. Not sure why #orderProductId doesn't interpret correctly.

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Ah, the joy of %#$ in OGNL... This doesn't work ?

<s:iterator value="%{order.getProductById(orderProductId).activations}">