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https://issues.apache.org/jira/browse/WICKET-6324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sven Meier resolved WICKET-6324.
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Resolution: Fixed
Fix Version/s: 8.0.0-M4
Thanks, I fixed some other callback methods too.
> AjaxFallbackButton#onError parameter type should be
> Optional<AjaxRequestTarget>
> -------------------------------------------------------------------------------
>
> Key: WICKET-6324
> URL: https://issues.apache.org/jira/browse/WICKET-6324
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 8.0.0-M3
> Reporter: Andrew Geery
> Assignee: Sven Meier
> Priority: Minor
> Fix For: 8.0.0-M4
>
>
> The parameter for AjaxFallbackButton#onSubmit is Optional<AjaxRequestTarget>
> because the AjaxRequestTarget can be null. However, the parameter for
> AjaxFallbackButton#onError is AjaxRequestTarget. The AjaxRequestTarget can
> be null so the parameter to #onError should follow #onSubmit and also be
> Optional.
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