[WW-3010] s:iterator fails to iterate over collections containing null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.14
• Fix Version/s: 2.5

Environment

any

• Assignee: Unassigned
• Reporter: Daniel Baldes
• Created: 24/Feb/09 15:29
• Updated: 12/Oct/16 14:27
• Resolved: 14/Jan/16 18:26

Description

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.

Issue Links

• is duplicated by: WW-4312 A problem on Iterator tag