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https://issues.apache.org/jira/browse/WICKET-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465864
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Igor Vaynberg commented on WICKET-223:
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in 1.x branch the code looks like this
if (group.hasRawInput())
{
final String[] input = group.getInputAsArray();
if (input != null)
{ ....
what does it look like in your version?
> NPE in Check.onComponentTag
> ---------------------------
>
> Key: WICKET-223
> URL: https://issues.apache.org/jira/browse/WICKET-223
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.2.4
> Reporter: Alex Burgel
> Assigned To: Igor Vaynberg
> Priority: Critical
>
> I've been getting NPEs in wicket.markup.html.form.Check line 132 since
> upgrading to wicket 1.2.4
> it seems that it is possible for FormComponent.getInputAsArray() can return
> null rather than an empty array.
> a fix would be to do a null check in Check or ensure that getInputAsArray()
> never returns null
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