DO NOT REPLY [Bug 20172] New: - NPE when normalizing documents

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=20172

NPE when normalizing documents

           Summary: NPE when normalizing documents
           Product: Xerces2-J
           Version: 2.4.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: DOM
        AssignedTo: xerces-j-dev@xml.apache.org
        ReportedBy: adrian@ephox.com


Using the DOM3 API to normalize a document, a NullPointerException is thrown in 
the case that schema validation is being used and there is an Element with only 
one child which is not a text node.

This can be seen with the DOM3 sample (ie: dom/DOM3.java) by parsing an XML 
file like (full test case will be attached):

<?xml version="1.0"?>
<poem>
<stanza><line/></stanza>
</poem>

When Xerces gets to the stanza element it throws a NullPointerException like:
java.lang.NullPointerException
	at org.apache.xerces.dom.DOMNormalizer.endElement
(DOMNormalizer.java:1487)
	at org.apache.xerces.impl.xs.XMLSchemaValidator.endElement
(XMLSchemaValidator.java:790)
	at org.apache.xerces.dom.DOMNormalizer.normalizeNode
(DOMNormalizer.java:378)
	at org.apache.xerces.dom.DOMNormalizer.normalizeNode
(DOMNormalizer.java:355)
	at org.apache.xerces.dom.DOMNormalizer.normalizeDocument
(DOMNormalizer.java:238)
	at org.apache.xerces.dom.CoreDocumentImpl.normalizeDocument
(CoreDocumentImpl.java:989)
	at com.ephox.editlive.java2.editor.xml.XMLFilter.validateXML
(XMLFilter.java:1036)
	at com.ephox.editlive.java2.editor.xml.ui.XMLPane.<init>
(XMLPane.java:106)
	at com.ephox.editlive.java2.editor.Editor.<init>(Editor.java:55)
	at com.ephox.editlive.java2.TestHarness.jbInit(TestHarness.java:191)
	at com.ephox.editlive.java2.TestHarness.<init>(TestHarness.java:98)
	at com.ephox.editlive.java2.TestHarness.main(TestHarness.java:346)

(Full output of the DOM3 sample will be attached)

Essentially, ParentNode.getTextContent() is returning null but 
DOMNormalizer.endElement isn't expecting a null.  The method 
ParentNode.hasTextContent(Node) looks particularly suspicious since it returns 
false for all the node types that can have text content and true for Element 
nodes for which getNodeValue() must always return null.

This occurs with the latest version from CVS as well as the 2.4.0 release with 
both JDK 1.4.1 and 1.3.1.

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