[jira] Assigned: (WICKET-486) NullPointerException when using CheckGroup and a Validator

["Igor Vaynberg (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Igor Vaynberg reassigned WICKET-486:
------------------------------------

    Assignee: Igor Vaynberg

> 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
>         Assigned To: Igor Vaynberg
>
> 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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