Parsing XML using java DOM

Question

hi
i am trying to parse a document and change a specific text value within an element althouh when i run the program it changes the nodes text however when i check the xml file it doesnt show the changes it remains the same the code that i am using is as follow iwould be greatful if any one culd help:
//  ReplaceText.java
// Reads intro.xml and replaces a text node.
// Java core packages
import java.io.*;
// Java extension packages
import javax.xml.parsers.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.*;
// third-party libraries
import org.xml.sax.*;
import org.w3c.dom.*;
public class ReplaceText {
   private Document document;
   public ReplaceText()
      // parse document, find/replace element, output result
      try {
         // obtain default parser
         DocumentBuilderFactory factory =
            DocumentBuilderFactory.newInstance();
         // set parser as validating          
         factory.setValidating( true );
         // obtain object that builds Documents
         DocumentBuilder builder = factory.newDocumentBuilder();
         // set error handler for validation errors
         builder.setErrorHandler( new MyErrorHandler() );
  System.err.println( "reading" );
         // obtain document object from XML document
         File f = new File("D:/Documents and Settings/Administrator/Desktop/xml adv java bk/appC/intro.xml");
          System.err.println( "reading" );
         document = builder.parse(f);
//document = builder.parse( new File( "intro.xml" ) );
System.err.println( "reading document" );
         // retrieve the root node
         Node root = document.getDocumentElement();
         if ( root.getNodeType() == Node.ELEMENT_NODE ) {
            Element myMessageNode = ( Element ) root;
            NodeList messageNodes =
               myMessageNode.getElementsByTagName( "message5" );
            if ( messageNodes.getLength() != 0 ) {
               Node message = messageNodes.item( 0 );
                    System.out.println("iiiii");
               // create text node
               Text newText = document.createTextNode(
                  "New Changed Message!!" );
               // get old text node
               Text oldText =
                  ( Text ) message.getChildNodes().item( 0 ); 
               // replace text
               //message.removeChild(oldText);
               message.replaceChild( newText, oldText );
         // output Document object
         // create DOMSource for source XML document
         Source xmlSource = new DOMSource( document );
         // create StreamResult for transformation result
         Result result = new StreamResult( System.out );
         // create TransformerFactory
         TransformerFactory transformerFactory =
            TransformerFactory.newInstance();
         // create Transformer for transformation
         Transformer transformer =
            transformerFactory.newTransformer();
         transformer.setOutputProperty( OutputKeys.INDENT, "yes" );
           transformer.setOutputProperty( OutputKeys.STANDALONE, "yes" );
         // transform and deliver content to client
         transformer.transform( xmlSource, result );
      // handle exception creating DocumentBuilder
      catch ( ParserConfigurationException parserException ) {
         parserException.printStackTrace();
      // handle exception parsing Document
      catch ( SAXException saxException ) {
         saxException.printStackTrace();        
      // handle exception reading/writing data
      catch ( IOException ioException ) {
         ioException.printStackTrace();
         System.exit( 1 );
      // handle exception creating TransformerFactory
      catch (
         TransformerFactoryConfigurationError factoryError ) {
         System.err.println( "Error while creating " +
            "TransformerFactory" );
         factoryError.printStackTrace();
      // handle exception transforming document
      catch ( TransformerException transformerError ) {
         System.err.println( "Error transforming document" );
         transformerError.printStackTrace();
   public static void main( String args[] )
      ReplaceText replace = new ReplaceText();   
}the xml file that i am using is as follows:
<?xml version = "1.0"?>
<!-- Fig. 28.10 : intro.xml             -->
<!-- Simple introduction to XML markup   -->
<!DOCTYPE myMessage [
     <!ELEMENT myMessage (message, message5)>
     <!ELEMENT message (#PCDATA)>
     <!ELEMENT message5 (#PCDATA)>
]>
<myMessage>
     <message>welcome to the xml shhhhhushu</message>
     <message5>welcome to the xml shhhhhushu</message5>
</myMessage>i would be greatful if some one could please help.....

Answer 1

See if the Text 'oldText' actually has any text within it. Sometimes in DOM parsing, you will get something like:
Element
   Text (blank)
   Text (actual)
   Text (blank)Whereas you would expect to receive:
Element
   Text (actual)See if that is the case. If yes, modify your logic to iterate through the child text nodes until one with actual text inside of it (getNodeValue()) is found.
- Saish