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https://issues.apache.org/jira/browse/WICKET-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618979#action_12618979
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Johan Compagner commented on WICKET-1766:
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i think we will never guarantee that we will not call it more then once
I even think that we in wicket should cache it as little as possible and call
size() as much as possible
> Method size() of a data provider is invoked twice.
> --------------------------------------------------
>
> Key: WICKET-1766
> URL: https://issues.apache.org/jira/browse/WICKET-1766
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.3.4
> Environment: Ubuntu
> Reporter: Rik van der Kleij
> Assignee: Igor Vaynberg
> Priority: Minor
> Fix For: 1.3.5
>
>
> Method size() of a data provider is invoked twice during one request. This
> happens when navigating to a next or latest page in a data table. During
> debugging I noticed that the onDetach() of AbstractPageableView is invoked an
> extra time. Implementations of size() normally query the database so it will
> slow down the performance.
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