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https://issues.apache.org/jira/browse/WW-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart closed WW-2797.
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Resolution: Fixed
> Allow select headerKey to be resolved to non-string objects
> -----------------------------------------------------------
>
> Key: WW-2797
> URL: https://issues.apache.org/jira/browse/WW-2797
> Project: Struts 2
> Issue Type: Improvement
> Components: Plugin - Tags
> Reporter: Scott Lewis
> Priority: Major
> Fix For: 6.1.0
>
>
> Currently, it seems that the headerKey value always resolves to a String.
> However, sometimes the list that corresponds to the rest of the select may
> have keys that resolve to other objects, such as Integer. Thus, when passing
> in lists of "selected values", if you use this other object type, such as a
> List<Integer>, the headerKey value cannot be "pre-selected", as the types
> will not match; you'd have to use a more generic List to get it to work.
> It would be nice if you could have headerKey match the type of the other keys
> in the list, or at least be compatible with lists of a certain type.
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