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https://issues.apache.org/jira/browse/WICKET-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16148719#comment-16148719
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ASF subversion and git services commented on WICKET-6451:
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Commit 10f5f76e5d84a85a8aa260b1fd0502bb29a3cc7e in wicket's branch
refs/heads/master from [~svenmeier]
[ https://git-wip-us.apache.org/repos/asf?p=wicket.git;h=10f5f76 ]
WICKET-6451 enhance support for unmodifiable or null sets
> Real Exception while setting model object is hidden
> ---------------------------------------------------
>
> 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
> 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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