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https://issues.apache.org/jira/browse/WICKET-6266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15634306#comment-15634306
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Sebastian Gooren commented on WICKET-6266:
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Good to see my assumptions were correct. I was just browsing the user guide and 
think I know what you are referring to (Chapter 26.2 "Markup parsing and 
autocomponents", the line "first their tag is identified by a IMarkupFilters 
which also takes care of assigning a unique tag id.").

Thank you for helping me resolve this, much appreciated. Now we can make the 
switch to 7.5.0.

Feel free to close this issue.

PS As I said in my e-mail to the user list about this JIRA ticket, I would also 
like to request write access to the wiki to list the company I work for under 
"Companies that provide services".

> Component resolvers & variation broken in 7.5.0
> -----------------------------------------------
>
>                 Key: WICKET-6266
>                 URL: https://issues.apache.org/jira/browse/WICKET-6266
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 7.5.0
>            Reporter: Sebastian Gooren
>            Assignee: Andrea Del Bene
>         Attachments: quickstart.zip
>
>
> Auto components fail to render in certain cases due to changes in 
> https://issues.apache.org/jira/browse/WICKET-6231.
> See attached quickstart.
> If you use a component resolver in a page which overrides {{getVariation()}}, 
> but the html file for that page is the "default" one (without the variation 
> in the filename), wicket throws an RTE (MarkupNotFoundException: Markup not 
> found for Component: [WebMarkupContainer [Component id = custom0]]).
> Debugging reveals that this is caused by the change to 
> {{Component#getMarkup()}}. The markup that is set for auto-components might 
> not have the same variation as the html file in which it is used. Because of 
> this, the new {{markupHasCurrentVariation()}} returns {{false}}, and we fall 
> through to the end of {{getMarkup()}}. As the auto-component is dynamically 
> added on each render, {{parent.getMarkup(this)}} returns {{null}} - the 
> markup id gets created on the fly by component resolvers.



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