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https://issues.apache.org/jira/browse/WICKET-6324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880302#comment-15880302
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ASF subversion and git services commented on WICKET-6324:
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Commit 1d8a9c780756130fad77135aa54717552bdd41c9 in wicket's branch
refs/heads/master from [~svenmeier]
[ https://git-wip-us.apache.org/repos/asf?p=wicket.git;h=1d8a9c7 ]
WICKET-6324 optional for all callbacks
> 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
>
> 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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