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

["Ivana Cace (JIRA)" <ji...@apache.org>]

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

Ivana Cace updated WICKET-486:
------------------------------

    Summary: NullPointerException when using CheckGroup and a Validator  (was: nullvalue when using CheckGroup and a Validator)

> 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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