[WW-5451] NullPointerException when <s:iterator> value array contains a null in the first entry

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.4.0
• Fix Version/s: 6.6.1
• Assignee: Unassigned
• Reporter: Jon Pulice
• Created: 31/Jul/24 14:18
• Updated: 05/Oct/24 13:59
• Resolved: 01/Aug/24 10:02

Description

When the first entry in an array contains a null value, and that array is used as the source for an <s:iterator> tag, a NullPointerException is thrown. This exception did not occur in prior versions of Struts 6.x

Exception:

 

ERROR org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler - Exception occurred during processing request: null
java.lang.NullPointerException: null
    at org.apache.struts2.components.IteratorComponent.start(IteratorComponent.java:309) ~[struts2-core-6.4.0.jar:6.4.0]
    at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:51) ~[struts2-core-6.4.0.jar:6.4.0]
    ...

 

 

A trivial example would be this tag:

<s:iterator value="pages">
    ...
</s:iterator>

and Action:

 

public class TestAction extends ActionSupport {    
    private Object[] pages = null;    
    
    public String prompt() throws Exception {
        pages = new Object[10];
        return SUCCESS;
    }
}

 

 

Issue Links

• is broken by: WW-5352 Implement annotation mechanism for injectable fields via parameters
• links to: GitHub Pull Request #1008