[XERCESJ-1147] Parsed document is not fully initialized until getFirstChild() is called

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.8.1
• Component/s: DOM (Level 3 Core)
• Environment: java version "1.5.0_06"; Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05); Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing); ; Saxon: saxonb8-7j
• Assignee: Michael Glavassevich
• Reporter: Libor Valenta
• Created: 17/Mar/06 15:41
• Updated: 12/Sep/06 20:54
• Resolved: 12/Sep/06 15:01

Description

I have problems with Xerces bundled with JDK 1.5 as well as Xerces-J 2.8.0, I was usin XSLT 2.0 transformer Saxon 8.7 to access document produced by java extension. Problems go away when I call document.getFirstChild(); before returning document for the transformation, the side-effect of getFirstChild() makes me believe that there is something wrong with implementation of the Document.

Here is simple code to demostrate the problem Test .java:

import org.w3c.dom.Document;
import org.xml.sax.InputSource;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import java.io.StringReader;
import java.io.StringWriter;

public class Test {

// this will call test1() which DOES call getFirstChild() before document is returned
static String XSL1 = "<?xml version=\"1.0\"?>\n" +
"<xsl:stylesheet xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\" version=\"2.0\" xmlns:test=\"Test\">\n" +
" <xsl:template match=\"/\">\n" +
" <xsl:copy-of select=\"test:test1()\"/>\n" +
" </xsl:template>\n" +
"</xsl:stylesheet>";

// this will call test2() which DOES NOT call getFirstChild() before document is returned
static String XSL2 = "<?xml version=\"1.0\"?>\n" +
"<xsl:stylesheet xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\" version=\"2.0\" xmlns:test=\"Test\">\n" +
" <xsl:template match=\"/\">\n" +
" <xsl:copy-of select=\"test:test2()\"/>\n" +
" </xsl:template>\n" +
"</xsl:stylesheet>";

public static void main(String[] args) throws Exception

{ transform(XSL1); // Result is: <?xml version="1.0" encoding="UTF-8"?><y/> transform(XSL2); // Result is: }

private static void transform(String xsl) throws TransformerException

{ Transformer transformer = TransformerFactory.newInstance().newTransformer(new StreamSource(new StringReader(xsl))); StringWriter out = new StringWriter(); transformer.transform(new StreamSource(new StringReader("<x/>")), new StreamResult(out)); System.out.println("Result is: " + out); }

public static Document test1() throws Exception

{ DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document document = documentBuilder.parse(new InputSource(new StringReader("<y/>"))); // next call has some side-effect that make things work, synchronizeChildren() ? // likely bug in com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl document.getFirstChild(); return document; }

public static Document test2() throws Exception

{ DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document document = documentBuilder.parse(new InputSource(new StringReader("<y/>"))); return document; }

}

I do not know how Saxon is using the document, but whatever it does, it should behave same way for test1() and test2()