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https://issues.apache.org/jira/browse/WICKET-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704547#comment-16704547
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Thomas Heigl commented on WICKET-6616:
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The use-case in my test is very simple. On a stateful page, it works as 
expected. On a stateless page it fails and as a developer I can't be sure if my 
lifecycle callbacks will be executed or not. This makes it extremely hard to 
reason about non-trivial (i.e. everything is added in the constructor) 
stateless pages.

In my opinion, stateless pages should behave as much as stateful pages as 
possible. I'd vote for always rendering them.

> Stateless pages are not rendered anymore before executing a behavior
> --------------------------------------------------------------------
>
>                 Key: WICKET-6616
>                 URL: https://issues.apache.org/jira/browse/WICKET-6616
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-core
>    Affects Versions: 8.2.0
>            Reporter: Thomas Heigl
>            Priority: Major
>         Attachments: myproject.zip
>
>
> I just upgraded from 8.1.0 to 8.2.0 and a bunch of my tests broke. A required 
> form component on a stateless page that is hidden in "onConfigure" started to 
> report an error after the upgrade.
> The problem was introduced in WICKET-6608 by this commit:
> [https://github.com/apache/wicket/commit/147f6d33f839edd9a6eb53ce9c20b4cde07fc938]
> Previously, the page was initialized *and* rendered before returning the 
> component. Now, for some reason, the page is initialized and the component 
> returned immediately if it exists. This breaks all visibility/enabled 
> conditions that are evaluated later in the life cycle of stateless components.



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