Problem serializing processing instruction with LSSerializer

[Karthik Shiraly]

Greetings!

I'm facing a problem while using the DOM 3 Load-Save API's LSSerializer to serialize a DOM Document. The Document contains 2 processing instructions and a document element with child nodes. But when it's serialized, the second processing instruction <?metadataRepository?> appears after the document element in output file. Details are below. Please advise what I'm doing wrong.

Details:
Sun JRE 1.6.0_07
Using the internal Xerces API shipped with JRE
Windows XP

What the code does is:
1. Load the file WellFormedSmallSample.xml using Documentbuilder.parse() to get a Document.
2. Save this Document back to another file TestLSOutput.xml using DOM 3 LSSerializer

  
package sandbox.dom;
 
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
 
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.DOMStringList;
import org.w3c.dom.Document;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
import org.xml.sax.SAXException;
 
public class DomSandbox {
    public static void main(String[] args) {
        try {
            // Read XML into DOM tree.
            DocumentBuilderFactory bldFct = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBld = bldFct.newDocumentBuilder();
            Document doc = docBld.parse(new File("WellFormedSmallSample.xml"));
            if (doc == null) {
                return;
            }
 
            DOMConfiguration domConfig = doc.getDomConfig();
            outputDomConfig(domConfig);
 
            // Write back DOM tree to another file using LSSerializer.
            DOMImplementation domImpl = doc.getImplementation();
            Object feature = domImpl.getFeature("LS", "3.0");
            if (feature == null) {
                System.out.println("Does not support LS 3.0");
                return;
            }
            DOMImplementationLS lsImpl = (DOMImplementationLS)feature;
            LSOutput lsOutput = lsImpl.createLSOutput();
            LSSerializer lsSerializer = lsImpl.createLSSerializer();
            DOMConfiguration lsConfig = lsSerializer.getDomConfig();
            lsConfig.setParameter("format-pretty-print", Boolean.TRUE);
            outputDomConfig(lsConfig);
 
            File outfile = new File("TestLSOutput.xml");
            if (outfile.exists()) {
                outfile.delete();
            }
            outfile.createNewFile();
            BufferedWriter writer = new BufferedWriter(new FileWriter(outfile));
            lsOutput.setCharacterStream(writer);
 
            lsSerializer.write(doc, lsOutput);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }
    }
 
    // Output DOM configuration.
    private static void outputDomConfig(DOMConfiguration domConfig) {
        DOMStringList parameterNames = domConfig.getParameterNames();
        int count = parameterNames.getLength();
        for (int i = 0; i < count; i++) {
            System.out.println(parameterNames.item(i) + "=" 
                    +domConfig.getParameter(parameterNames.item(i)));
        }
    }
}

Input file WellFormedSmallSample.xml:

<?xml version='1.0' encoding='UTF-8'?>
<?metadataRepository class='test' version='1.0.0'?>
<repository name='test' type='testtype' version='1.0.0'>
  <properties size='2'>
  </properties>
  <units size='834'>
  </units>
</repository>

Output file

<?xml version="1.0" encoding="UTF-8"?>
<repository name="test" type="testtype" version="1.0.0">
    <properties size="2"/>
    <units size="834"/>
</repository>
<?metadataRepository class='test' version='1.0.0'?>

Application output

JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
JAXP: loaded from fallback value: com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
JAXP: created new instance of class com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl using ClassLoader: null
comments=true
datatype-normalization=false
cdata-sections=true
entities=true
split-cdata-sections=true
namespaces=true
validate=false
infoset=false
normalize-characters=false
canonical-form=false
validate-if-schema=false
check-character-normalization=false
well-formed=true
namespace-declarations=true
element-content-whitespace=true
error-handler=null
schema-type=null
schema-location=null
resource-resolver=null
http://apache.org/xml/properties/internal/grammar-pool=null
http://apache.org/xml/properties/internal/symbol-table=com.sun.org.apache.xerces.internal.util.SymbolTable@1bf6770
http://apache.org/xml/features/validation/schema/augment-psvi=true
namespaces=true
split-cdata-sections=true
discard-default-content=true
xml-declaration=true
canonical-form=false
validate-if-schema=false
validate=false
check-character-normalization=false
datatype-normalization=false
format-pretty-print=true
well-formed=true
infoset=false
namespace-declarations=true
element-content-whitespace=true
entities=true
cdata-sections=true
comments=true
ignore-unknown-character-denormalizations=true
error-handler=null

The output file contains <?metadataRepository?> processing instruction after <repository> element. How do I correct this?

Thank you
Karthik