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https://issues.apache.org/jira/browse/WICKET-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13693812#comment-13693812
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Martin Grigorov commented on WICKET-5252:
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Then why you use such object in a (property)model ?!
This is not a problem of Wicket. Wicket doesn't know of/use your objects unless 
you tell it.
                
> PropertyResolver breaks immutable objects by calling setAccessible
> ------------------------------------------------------------------
>
>                 Key: WICKET-5252
>                 URL: https://issues.apache.org/jira/browse/WICKET-5252
>             Project: Wicket
>          Issue Type: Bug
>    Affects Versions: 6.8.0
>            Reporter: Daniel Zwicker
>
> If a Bean only have private fields and no setter this object is immutable. 
> The decision to implement such an object has a bunch of implications. e.g. it 
> is thread safe, you can take snapshots of these object to store a version 
> history and so on.
> Now your use of reflection breaks this isolation silently. I believe if 
> somebody want set the values of the object he should implement a setter or 
> provide a public field.   

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