Problems with control tag "if"

Hi,

i am new with struts 2 and freemarker.
i can't find where the error is.

i have got a list and it works

<@s.iterator value="products" var="product">
<@s.property value="%{#product.productData.productName}"/>
</@s.iterator>

but how can i use the if-control tag in the iteration?

doesn't work
<@s.iterator value="products" var="product">
<@s.if test='product.productData.productIsOnline = 1'>
    available
</@s.if>
<@s.property value="%{#product.productData.productName}"/>
</@s.iterator>

also works: 
<@s.if test='products.size() > 0'>
</@s.if>

i tested the different data types like boolean, string and integer for
product.productData.productIsOnline

thanks for help,
lars
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