[XERCESJ-1589] NullPointerException when parsing an instance that has a XSD 1.0 schema with 'defaultOpenContent' element

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.11.0
• Fix Version/s: 2.12.0
• Component/s: XML Schema 1.0 Structures, XML Schema 1.1 Structures
• Assignee: Michael Glavassevich
• Reporter: Octavian Nadolu
• Created: 24/Sep/12 09:32
• Updated: 16/Apr/18 07:24
• Resolved: 28/Sep/12 19:57

Description

If I parse the instance.xml file using the following java code, I get an NullPointerException. I tested on the xml-schema-1.1-dev branch.

---------Java code----------------------
XMLReader parser = new org.apache.xerces.parsers.SAXParser();
parser.setFeature(Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_VALIDATION_FEATURE, true);
parser.parse("file:/C:/instance.xml");
--------------------------------------

----------------instance.xml------------------
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="schema.xsd"/>
-------------------------------------------------------

--------------------schema.xsd----------------
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:defaultOpenContent mode="suffix">
<xs:any/>
</xs:defaultOpenContent>

<xs:element name="root"/>
</xs:schema>
--------------------------------------------------------

-----------NullPointerException -------------------------------
Exception in thread "main" java.lang.NullPointerException
at org.apache.xerces.impl.xs.traversers.XSDComplexTypeTraverser.traverseOpenContent(XSDComplexTypeTraverser.java:268)
at org.apache.xerces.impl.xs.traversers.XSDHandler.buildGlobalNameRegistries(XSDHandler.java:1481)
at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:716)
at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:644)
at org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar(XMLSchemaValidator.java:3074)
at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:2259)
at org.apache.xerces.impl.xs.XMLSchemaValidator.emptyElement(XMLSchemaValidator.java:880)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:275)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(XMLNSDocumentScannerImpl.java:733)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1754)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:324)
at org.apache.xerces.parsers.XML11Configuration.parse(XML11Configuration.java:890)
at org.apache.xerces.parsers.XML11Configuration.parse(XML11Configuration.java:813)
at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:108)
at org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1129)
---------------------------------------------------------------------------

It seems that in the XSDHandlerXerces.buildGlobalNameRegistries(), the method XSDComplexTypeTraverser.traverseOpenContent(Element, XSDocumentInfo, SchemaGrammar, boolean) is called even if the current schema version is 1.0. For 1.0 this method should not be called.
Also the XSAttributeCheckerXerces.checkAttributes(Element, boolean, XSDocumentInfo, boolean) method can return null in some cases, maybe you should check that the attributes array is not null before using it.