[jira] [Commented] (WICKET-6451) Components with collection models do not support unmodifiable or empty sets

["Kamil (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WICKET-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16148779#comment-16148779 ] 

Kamil commented on WICKET-6451:
-------------------------------

Thank you Sven :)

> Components with collection models do not support unmodifiable or empty sets
> ---------------------------------------------------------------------------
>
>                 Key: WICKET-6451
>                 URL: https://issues.apache.org/jira/browse/WICKET-6451
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket
>    Affects Versions: 8.0.0-M6
>            Reporter: Kamil
>            Assignee: Sven Meier
>            Priority: Minor
>             Fix For: 8.0.0-M8
>
>         Attachments: showcase-hiddenException.zip
>
>
> When object returns Collections.unmodifiableSet() it is obvious that model object can not be updated.
> But the exception that was thrown causes me to spend hours until I found out that:
> {code}
> Last cause: Could not convert value: [] to type: java.util.Set. Could not find compatible converter.
> WicketMessage: An error occurred while trying to set the collection attached to [BootstrapMultiSelect [Component id = children]]
> {code}
> Is not about converter but about unmodifialble set, because the real exception was hidden!
> 1)Run the app
> 2)Click submit
> 3)Caused by User#L30



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