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https://issues.apache.org/jira/browse/XERCESJ-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Glavassevich resolved XERCESJ-1582.
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Resolution: Fixed
Fixed in SVN rev 1380453 and 1380454.
> Node prefix/namespace query methods throw an NPE on a document without a
> document element
> -----------------------------------------------------------------------------------------
>
> Key: XERCESJ-1582
> URL: https://issues.apache.org/jira/browse/XERCESJ-1582
> Project: Xerces2-J
> Issue Type: Bug
> Components: DOM (Level 3 Core)
> Affects Versions: 2.9.1
> Reporter: Andreas Veithen
> Assignee: Michael Glavassevich
> Priority: Minor
>
> According to appendix B.4 of the DOM Level 3 Core specification, calling
> Node#lookupNamespaceURI on a Document node actually performs the lookup on
> the document element. This is implemented by Xerces, but the code doesn't
> take into account that the Document may be empty (or not have a document
> element). On such Document instances, the lookupNamespaceURI throws a
> NullPointerException.
> The issue can be demonstrated using the following code:
> Document document =
> DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
> System.out.println(document.lookupNamespaceURI("p"));
> It is caused by the following piece of code in NodeImpl:
> case Node.DOCUMENT_NODE : {
>
> return((NodeImpl)((Document)this).getDocumentElement()).lookupNamespaceURI(specifiedPrefix);
> }
> The issue has been observed with Xerces 2.9.1, but the code in the trunk is
> unchanged.
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