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https://issues.apache.org/jira/browse/WICKET-6608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16676844#comment-16676844
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Andrea Del Bene commented on WICKET-6608:
-----------------------------------------
When a component on a stateless page is not found by
PageAndComponentProvider#findComponent, the page is initialized and rendered in
order to invoke possible code that could add the component. Now page rendering
is performed only if initialization is not enough to create such component.
> Stateless page, mix of queue and add can cause unforseen consequences
> ---------------------------------------------------------------------
>
> Key: WICKET-6608
> URL: https://issues.apache.org/jira/browse/WICKET-6608
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 8.1.0
> Reporter: Oddgeir Bell
> Assignee: Andrea Del Bene
> Priority: Minor
> Attachments: statelessQueueAdd.zip
>
>
> We are in the process of upgrading a Wicket 6.x application to Wicket 8.1,
> mostly because we needed stateless ajax.
> In the process we discovered something quite unexpected (took a few days to
> figure out the cause).
> This is the issue:
> Stateless page.
> Hierarchy like so:
> Page
> ->Container
> ->Label
> ->AjaxButton
>
> The label should only be visible when it's model has data, so we override
> onConfigure and set visible = (getDefaultModelObject != null).
> This works if all components are added with add(Component).
> It also works if all components are added with queue(Component).
> BUT, if the container is added with add(Component) and the AjaxButton is
> added with queue(Component), it doesn't work.
> Actually, if just one component is added to the page with queue(Component),
> things seem to work (as long as it is queue-ed AFTER the container is add-ed)
> I could not find any information on dangers of mixing add/queue with my
> google-fu, so it may look like it's a bug?
>
> Attached quickstart that shows the issue.
>
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