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https://issues.apache.org/jira/browse/WICKET-6362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-6362.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 7.8.0
                   8.0.0-M6
                   6.27.0

Fixed by implementing proper #equals() and #hashCode() methods for all 
HeaderItem implementations.

> HeaderItems with different PageParameters are treated as identical
> ------------------------------------------------------------------
>
>                 Key: WICKET-6362
>                 URL: https://issues.apache.org/jira/browse/WICKET-6362
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 7.5.0, 8.0.0-M5
>            Reporter: Boris Goldowsky
>            Assignee: Martin Grigorov
>            Priority: Minor
>             Fix For: 6.27.0, 8.0.0-M6, 7.8.0
>
>
> Given code like the following, where same ResourceReference is used for both 
> resources but they have different PageParameters and different IDs, only one 
> of them actually gets rendered in the page head:
> {code}
> public void renderHead(IHeaderResponse response) {
>     …
>     response.render(JavaScriptHeaderItem.forReference(resRef, 
> pageParameters1, “id1”));
>     response.render(JavaScriptHeaderItem.forReference(resRef, 
> pageParameters2, “id2”));
> }
> {code}



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