Struts 2 dynamic variables

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It seems like a workaround but you can use attr to evaluate string.

<s:set var="myNum" value="numConst" />
<s:set var="number" value="'@xxx.CommonConstant@'+#myNum" />

<s:property value="#attr[#number]"/>

<s:if test="#attr[#number] == 9">
  do something
</s:if>

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