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https://issues.apache.org/jira/browse/WICKET-6306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826210#comment-15826210
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Andrea Del Bene commented on WICKET-6306:
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Hi [~forchel],
last snapshots should solve the problems with border and nested components.
> Changing model object of Panel added to a Border not allowed
> ------------------------------------------------------------
>
> Key: WICKET-6306
> URL: https://issues.apache.org/jira/browse/WICKET-6306
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 7.5.0, 7.6.0
> Reporter: Dirk Forchel
> Assignee: Andrea Del Bene
> Fix For: 7.7.0, 8.0.0-M4
>
> Attachments: testproject.zip
>
>
> It is not allowed to change the model object of a panel added to a border
> component (see attachment).
> The quickstart demonstrates the problem. Here you can find 3 test pages all
> with a TextField and a Panel with a TextField. For each component, the model
> object is set at the onConfigure method. At the first page both components
> are added to the page itself. At the second page both components are added to
> the border body container of a Border component. At the third page both
> components are added to a "Layout" container (a Border component too). The
> third page is not rendered with Wicket 7.5.0 (see stacktrace).
> It was working for Wicket 7.4.0
> org.apache.wicket.WicketRuntimeException: Cannot modify component hierarchy
> after render phase has started (page version cant change then anymore)
> at org.apache.wicket.Component.checkHierarchyChange(Component.java:3674)
> at org.apache.wicket.Page.dirty(Page.java:271)
> at org.apache.wicket.markup.html.WebPage.dirty(WebPage.java:332)
> at org.apache.wicket.Page.dirty(Page.java:250)
> at org.apache.wicket.Page.componentModelChanging(Page.java:904)
> at org.apache.wicket.Component.modelChanging(Component.java:2230)
> at org.apache.wicket.Component.setDefaultModelObject(Component.java:3133)
> at
> org.apache.wicket.markup.html.form.FormComponent.setModelObject(FormComponent.java:1579)
> at
> com.mycompany.front.wicket.components.TestPanel.onConfigure(TestPanel.java:30)
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