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https://issues.apache.org/jira/browse/WICKET-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-3972.
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Resolution: Fixed
Fix Version/s: 1.5-RC6
Assignee: Juergen Donnerstag (was: Peter Ertl)
Applied Juergen's suggestion. It solves the problem.
> wicket:message attribute results in "The component was rendered already" error
> ------------------------------------------------------------------------------
>
> Key: WICKET-3972
> URL: https://issues.apache.org/jira/browse/WICKET-3972
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 1.5-RC5.1
> Environment: Linux Ubuntu, Tomcat 6, Java 6
> Reporter: Sergiy Barlabanov
> Assignee: Juergen Donnerstag
> Fix For: 1.5-RC6
>
> Attachments: quickstart.zip, wicket-message-index.patch
>
>
> Seems like there is a problem with generation of tag and component IDs when
> using wicket:message as an attribute for tags inside ListView.
> The quickstart webapp is attached to this ticket. There are two pages in this
> webapp: HomePage with a ListView containing tags with wicket:message
> attribute and two tags with wicket:message attribute outside the ListView. If
> a user goes to the next page (SecondPage) using the link on HomePage and then
> goes back to HomePage using the link on SecondPage, the exception mentioned
> in the subject occurs.
> Seems that the ID generation for tags and components is wrong: the
> ComponentTag-s are cached together with the corresponding Markup and then
> reused for later renderings. But the problem is, that those ComponentTag-s
> are mutable (at least in case of tags with wicket:message attribute) and
> their IDs are changed on every rendering and this produces ID conflicts when
> MarkupContainer.renderNext tries to find or create components corresponding
> to the tags.
> Interesting is, that we can reproduce this bug only in DEVELOPMENT mode. In
> DEPLOYMENT mode everything seems to work. The solution would be to make
> ComponentTags immutable and do not allow to change them, but to create copies
> (there is mutable method in ComponentTag, which is used in some cases).
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