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https://issues.apache.org/jira/browse/WICKET-5454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13853284#comment-13853284
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Carl-Eric Menzel commented on WICKET-5454:
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This is an instantiation check so you can't pass an instance - it's not
available yet! [\[1\]|#1] This is IIRC done in Component's constructor. So I
don't see how one could change this without really breaking the semantics of
the instantiation permission.
I would solve your case by either using marker interfaces which you can check
on the class, or skipping the instantiation check and doing a render check
instead - there you get the instance.
{anchor:1}1: Technically, you could pass along a this reference from the
constructor. That's not at all safe though, since nothing is initialized yet.
> IAuthorizationStrategy#isInstantiationAuthorized(Class<T> componentClass)
> should be passed the instance, not only it's class
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: WICKET-5454
> URL: https://issues.apache.org/jira/browse/WICKET-5454
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 6.12.0
> Reporter: Tom Götz
> Priority: Minor
>
> It would be easier to decide if instantiation is authorized if one could
> access some properties of the component being constructed. Usecase: we
> restrict access to certain pages with an own IAuthorizationStrategy
> implementation, but we'd like error pages to be instantiated. Now, this is
> not easy to decide if you are only passed the page's class. A call to
> isErrorPage() would be more elegant in that situation.
> Is there a reason why the class, but not the instance is passed to
> IAuthorizationStrategy#isInstantiationAuthorized (see constructor of
> Application:
> https://github.com/apache/wicket/blob/master/wicket-core/src/main/java/org/apache/wicket/Application.java#L261)?
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