JSP comparing hashmap key with an object value

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Java

JSP

struts

Hi,
I am new to JSP and I am facing issue in executing a comparison of hashmap key and an object value. I have an object (Box) which has a string field (size). I have a hashmap also which contains list of Boxes based on size

Map<String, List<Box> boxCatgMap=new HashMap<String, List<Box>>();

  <s:iterator value="boxCatgMap" var="boxCatg">
        <s:set var="boxCatgKey" value="#boxCatg.key"/>
        <s:iterator value="boxes" var="box" status="ind">
           <s:if test="%{#box.size.equals(boxCatgKey)}">
            //some code
           </s:if></s:iterator>
  </s:iterator>

The if condition has some issue because of which it is not getting executed. Can any one please help what am I missing?

What I have tried:

I have been changing the if condition and the tags but it's not working. I am not sure what am i missing.