XPath.evaluate() and unexpanded entity references

Kevin Froese Mon, 07 Jul 2008 08:02:18 -0700

I'm getting a NullPointerException when calling XPath.evaluate() on adocument that has an unexpanded entity reference node. If I pass in thesame document with the entity reference expanded, everything works fine.I'm wondering if this expected behavior, a known issue, or if I shouldsubmit a bug report for this.


I'm using xalan 2.7.1 and xerces 2.9.0 with jdk 1.5.0_07.


Here's some code which re-produces the problem:

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

public class XPathTest {
 private static final String DOCUMENT_CONTENT =
   "<?xml version=\"1.0\"?>" +
   "<!DOCTYPE test [<!ENTITY foo SYSTEM \"foo\">]>" +
   "<test>&foo;</test>";

 private static final String XPATH = "//test";


 public static void main(String[] args) {

try {

     Document document = createDocument(DOCUMENT_CONTENT);

XPathFactory xpathFactory = XPathFactory.newInstance();XPath xpath = xpathFactory.newXPath();

     xpath.evaluate(XPATH, document, XPathConstants.NODESET);

     System.out.println("OK");
   } catch(Exception exception) {
     System.err.println("Caught exception: " + exception.getMessage());
     exception.printStackTrace(System.err);

     return;
   }
 }


 public static Document createDocument(String content) throws Exception  {

try {DocumentBuilderFactory documentBuilderFactory =DocumentBuilderFactory.newInstance();

documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities";,false);documentBuilderFactory.setFeature("http://apache.org/xml/features/dom/create-entity-ref-nodes";,true);

DocumentBuilder documentBuilder =documentBuilderFactory.newDocumentBuilder();byte[] contentBytes = content.getBytes();ByteArrayInputStream inputStream = newByteArrayInputStream(contentBytes);

     Document document = documentBuilder.parse(inputStream);

return document;

   } catch(Exception exception) {
     System.err.println("Caught exception: " + exception.getMessage());
     exception.printStackTrace(System.err);

System.exit(1);

return null;

 }
}


This is the result:

Caught exception: null
java.lang.NullPointerException

atcom.sun.org.apache.xml.internal.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:344)atcom.sun.org.apache.xml.internal.dtm.ref.DTMDefaultBaseTraversers$IndexedDTMAxisTraverser.getNextIndexed(DTMDefaultBaseTraversers.java:572)atcom.sun.org.apache.xml.internal.dtm.ref.DTMDefaultBaseTraversers$DescendantTraverser.next(DTMDefaultBaseTraversers.java:740)atcom.sun.org.apache.xpath.internal.axes.DescendantIterator.nextNode(DescendantIterator.java:215)atcom.sun.org.apache.xpath.internal.axes.NodeSequence.nextNode(NodeSequence.java:280)atcom.sun.org.apache.xpath.internal.axes.NodeSequence.runTo(NodeSequence.java:434)atcom.sun.org.apache.xml.internal.dtm.ref.DTMNodeList.<init>(DTMNodeList.java:79)atcom.sun.org.apache.xpath.internal.objects.XNodeSet.nodelist(XNodeSet.java:338)atcom.sun.org.apache.xpath.internal.jaxp.XPathImpl.getResultAsType(XPathImpl.java:323)atcom.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:276)

   at XPathTest.main(XPathTest.java:28)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException

atcom.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:281)

   at XPathTest.main(XPathTest.java:28)
Caused by: java.lang.NullPointerException

   ... 1 more


--
Kevin Froese

XPath.evaluate() and unexpanded entity references

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