Github user lukaszlenart commented on a diff in the pull request:
https://github.com/apache/struts/pull/7#discussion_r10771988
--- Diff: core/src/main/resources/template/simple/checkboxlist.ftl ---
@@ -29,7 +29,13 @@
<#else>
<#assign itemKey = stack.findValue('top')/>
</#if>
- <#if parameters.listValue??>
+ <#if parameters.listValueKey??>
--- End diff --
And one more thing - you must extend also `CheckboxList` class or
`ListUIBean` and add new field `listValueKey` - there is no magic which will
transfer `<s:checkbox valueKey="..."/>` to `listValueKey` ;-)
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