[jira] [Updated] (WICKET-4906) Form#visitFormComponents can cause ClassCastException

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

     [ https://issues.apache.org/jira/browse/WICKET-4906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jesse Bonzo updated WICKET-4906:
--------------------------------

    Attachment: WicketQuickStart.zip

This project demonstrates the problem
                
> Form#visitFormComponents can cause ClassCastException
> -----------------------------------------------------
>
>                 Key: WICKET-4906
>                 URL: https://issues.apache.org/jira/browse/WICKET-4906
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 6.3.0
>            Reporter: Jesse Bonzo
>            Priority: Minor
>              Labels: form, visit, wicket
>         Attachments: WicketQuickStart.zip
>
>
> The current method signature of Form#visitComponents allows for passing in an implementation of IVisitor that will cause a ClassCastException. 
> Example
> Add a CheckBox and TextField to the Form. Pass in an IVisitor<CheckBox> to visitComponents. There will be a ClassCastException when the IVisitor<CheckBox> attempts to visit the TextField.
> The method signature should be changed to
> public final <R> R visitFormComponents(final IVisitor<FormComponent<?>, R> visitor)
> or the method should be removed to prevent confusion.

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