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https://issues.apache.org/struts/browse/WW-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43565#action_43565
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Greg Lindholm commented on WW-2564:
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Did a little debugging and I think the problem is in the CheckboxInterceptor.
It's creating a new param to handle the not checked case, this isn't correct if
we have an array of checkboxes.
I think it needs to check if the parameter "__checkbox_xxx" value is an array
with size > 1 it should not create the new 'false' param.
If I can make this work I will submit the patch.
> Type Conversion of List<Integer> not working when list is empty.
> ----------------------------------------------------------------
>
> Key: WW-2564
> URL: https://issues.apache.org/struts/browse/WW-2564
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.0.11.1
> Environment: Windows XP
> Reporter: Ivan Rei
>
> When using a object of type List<Integer>, and that object comes empty from
> the JSP, you get a conversion error. Eg. Have 2 lists of checkboxes on the
> JSP. One is a List<String> and the other is List<Integer>, if I don't select
> any of the checkboxes of either type, I get a validation error
> (xwork.default.invalid.fieldvalue) on the integer list only. If I remove the
> integer list from the JSP, I get to the action.
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