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https://issues.apache.org/jira/browse/WICKET-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sven Meier resolved WICKET-3784.
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Resolution: Fixed
Fix Version/s: 1.5-RC6
Unified ListMultipleChoice, CheckGroup and MultiFileUploadField.
> ListMultipleChoice should allow its model to return a different collection on
> each access
> -----------------------------------------------------------------------------------------
>
> Key: WICKET-3784
> URL: https://issues.apache.org/jira/browse/WICKET-3784
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Affects Versions: 1.4.17
> Reporter: Sven Meier
> Assignee: Sven Meier
> Labels: collections, model
> Fix For: 1.5-RC6
>
> Attachments: ListMultipleChoice.diff
>
>
> With revision 646020 an unnecessary restriction was introduced to
> ListMultipleChoice, as the model is no longer allowed to return different
> collections on each invocation of #getObject().
> Note that this change is in conflict with the javadoc of #updateModel() which
> explicitely allows such usage:
> /**
> * If the model object exists, it is assumed to be a Collection, and it
> is modified in-place.
> * Then {@link Model#setObject(Object)} is called with the same
> instance: it allows the Model to
> * be notified of changes even when {@link Model#getObject()} returns a
> different
> * {@link Collection} at every invocation.
> */
> Please remove the check for identity of the model object, see attached patch.
> Thanks
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