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https://issues.apache.org/struts/browse/WW-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45967#action_45967
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Daniel Baldes commented on WW-3010:
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Well, every bug is bad behavior where someone could possibly rely on... of
course there are bugs where the "incorrectness" of the behavior is less
obvious, but I don't see why this just-plain-wrong behavior shouldn't be fixed
right away. Whatever.
> 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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