[jira] [Created] (WICKET-6450) FormComponent should not always create ArrayList when field is null

[Kamil (JIRA)]

Kamil created WICKET-6450:
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             Summary: FormComponent should not always create ArrayList when 
field is null
                 Key: WICKET-6450
                 URL: https://issues.apache.org/jira/browse/WICKET-6450
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 8.0.0-M6
            Reporter: Kamil
         Attachments: showcase-notCreateArrayList.zip

Sometimes we want to use Set as a backing object but FormComponent#L1600 always 
creates new ArrayList.

1)Run the app
2)Click submit
3)See what happens.
4)Everything works when User#L13 is uncommented



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