[jira] Commented: (WW-3010) s:iterator fails to iterate over collections containing null

["Musachy Barroso (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/struts/browse/WW-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45637#action_45637 ] 

Musachy Barroso commented on WW-3010:
-------------------------------------

I agree the current value ("id") should be set to null, but changing would potentially break current apps, so this should probably be fixed for 2.2 or so.

> s:iterator fails to iterate over collections containing null
> ------------------------------------------------------------
>
>                 Key: WW-3010
>                 URL: https://issues.apache.org/struts/browse/WW-3010
>             Project: Struts 2
>          Issue Type: Bug
>    Affects Versions: 2.0.14
>         Environment: any
>            Reporter: Daniel Baldes
>
> When using the struts2 taglib's iterator tag to iterate over a collection which contains nulls, the current value ("id") is not set to null, but to the value it had in the last iteration before. This behaviour is explicitly coded without any obvious reason. See IteratorComponent.java from line 219:
>             if ((id != null) && (currentValue != null)) {
>                 //pageContext.setAttribute(id, currentValue);
>                 //pageContext.setAttribute(id, currentValue, PageContext.REQUEST_SCOPE);
>                 stack.getContext().put(id, currentValue);
>             }
> Expected behaviour: just iterate over the null values as a plain java iterator would.
> If nulls are forbidden for some important reason, it should throw an execption, but not return a wrong value.

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