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https://issues.apache.org/jira/browse/WICKET-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12491825
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Jean-Baptiste Quenot commented on WICKET-486:
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As always, a small quickstart, or a unit test is more than welcome.
> NullPointerException when using CheckGroup and a Validator
> ----------------------------------------------------------
>
> Key: WICKET-486
> URL: https://issues.apache.org/jira/browse/WICKET-486
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.2.5
> Environment: tomcat 5.5, java 1.5
> Reporter: Ivana Cace
>
> Problem occurs when using a listView with a checkgroup in the same form with
> a input Validator. When the Validator detects invalid input *and* no items
> from the CheckGroup were selected, Wicket throws a NullPointer Exception on
> the first ListView item.
> Specifically, in the Check class, the group.getInputAsArray() returns null
> and causes the NPE:
> if (group.hasRawInput()) {
> final String[] input = group.getInputAsArray();
> for (int i = 0; i < input.length; i++)
> { ....
>
> The problem is solved by overriding the isNullable() method for CheckGroup to
> return false.
> @Override
> public boolean isInputNullable() {
> return false;
> }
> Apologies for describing symptoms rather than mechanism. More experienced
> programmers in the office think the model for CheckGroup is not attached or
> detached properly when used in conjunction with the (Pattern)Validator.
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