[jira] [Assigned] (WICKET-6451) Real Exception while setting model object is hidden

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

     [ https://issues.apache.org/jira/browse/WICKET-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sven Meier reassigned WICKET-6451:
----------------------------------

      Assignee: Sven Meier
      Priority: Minor  (was: Major)
    Issue Type: Improvement  (was: Bug)

FormComponent#updateCollectionModel() falls back to an ArrayList, if the collection cannot be modified *or* it is null.

> 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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