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https://issues.apache.org/jira/browse/XERCESJ-911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Michael Glavassevich resolved XERCESJ-911.
------------------------------------------

    Resolution: Invalid
      Assignee:     (was: Xerces-J Developers Mailing List)

As per my previous comments, this is a usage error.  Applications must 
synchronize their access to the DOM even if they're just reading it.

> Traversing the DOM throws NullPointerException
> ----------------------------------------------
>
>                 Key: XERCESJ-911
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-911
>             Project: Xerces2-J
>          Issue Type: Bug
>          Components: DOM (Level 3 Core)
>    Affects Versions: 2.6.2
>         Environment: Operating System: Other
> Platform: PC
>            Reporter: Malik Hemani
>
> I'm traversing a Document parsed by the DOMParser and running into 
> NullPointerExceptions. 
> The exception occurs at 
>      org.apache.xerces.dom.ParentNode.nodeListItem(Unknown Source)
>      org.apache.xerces.dom.ParentNode.item(Unknown Source)
> Sometimes is it also seen when 'NodeList.getLength()' is called.
> The traversing is done using a for loop and recursing into the routine, 
> EXAMPLE:
> ========
> Node findNode(Node parentNode) {
> NodeList childNodes = parentNode.getChildNodes();
> for(int i = 0; i < childNodes.getLength(); i++) {
>     Node child = childNodes.item(i);
>     if (child != null && child.getNodeType != Node.ELEMENT_NODE) {
>         continue;
>     }
>     else {
>         // do something
>         ...
>         ...
>     }
> }
> // Then recursively call the above routine
> for (int i = 0; i < childNodes.getLength(); i++) {
>     Node child = childnodes.item(i);
>     
>     if (child != null) {
>         Node found = findNode(child);
>         // more code to follow
>         ...
>         ...
>     }
> }
> }
> If you need the sample XML document, I prefer to email it you.
> Thanks.

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