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https://issues.apache.org/jira/browse/WICKET-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604317#comment-14604317
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Sven Meier commented on WICKET-5937:
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If you take a look at ListDataProvider#getData(), you'll notice that it is
indeed called twice: once for determining the #size() of the dataProvider and
once the #iterator() over the data is requested.
I don't see any difference between 1.5.x and 6.x here.
If you're loading the data list lazily, I'd suggest you implement IDataProvider
directly instead.
Or provide a quickstart if you still think something is going wrong.
> ListDataProvider calling getData() twice after upgrade to wicket6
> -----------------------------------------------------------------
>
> Key: WICKET-5937
> URL: https://issues.apache.org/jira/browse/WICKET-5937
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 6.6.0
> Reporter: Mark Christopher Newman
> Assignee: Sven Meier
> Priority: Minor
>
> We are upgrading our wicket from 1.5.6 to 6.6.0
> and have broken one of our pages that uses ListDataProvider.
> The method getData() is called twice. Previously it was called once.
> Couple of questions. could I be doing something that calls getData()?
> Looking at the stack in debug. The first call looks like its driven by
> getViewSize whereas the second call is getItemModels.
> Thanks
> Mark
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