Reading UTF-16: Content is not allowed in prolog

[Jones, David [deljones]]

Hi

I've been trying to write and read back a UTF-16 encoded XML document, without success. I can seemingly write the document ok (see  WriteUTF16.java ) and Firefox can open it without complaining (except the fact it doesn't have any style information). When I try and read back the document (using ReadUTF16.java) I get the following exception; -

 

 [Fatal Error] output.xml:1:40: Content is not allowed in prolog.
Exception in thread "main" org.xml.sax.SAXParseException: Content is not allowed
 in prolog.
        at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
        at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
        at ReadUTF16.main(ReadUTF16.java:47)

I'm not sure whether I'm missing something simple, doing something really stupid or even if it is a platform dependent thing (I'm using Windows XP and Windows 2000).

 

many thanks

 

david

 

 

 

------- ReadUTF16.java -------
import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;
import java.util.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;

 

public class ReadUTF16
{
 public static void main ( String rags[] ) throws Exception
 {
  System.out.println("read: main()");
  File f = new File ( "output.xml");
  
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = dbf.newDocumentBuilder();
  Document doc = db.parse( f.toURI().toString() );
 
  // serialise to console using jaxp 
    TransformerFactory tf = TransformerFactory.newInstance();  
  Transformer t = tf.newTransformer();
  t.setOutputProperty ( OutputKeys.INDENT , "yes" ) ;  
  DOMSource ds = new DOMSource ( doc  );  
  StreamResult res = new StreamResult  ( System.out ) ;
  t.transform ( ds , res ) ;
    
 }// end method
}// end class

 

 

------- WriteUTF16.java -------

import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;
import java.util.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;

 

public class WriteUTF16
{

 public static void main ( String rags[] ) throws Exception
 {
  System.out.println("main()");
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = dbf.newDocumentBuilder();
  Document doc = db.newDocument();
  Element element = doc.createElement( "tagname") ;
  element.setAttribute("test","test-value");
  doc.appendChild ( element ) ;
  // serialise using jaxp 
   File f = new File ( "output.xml");
  TransformerFactory tf = TransformerFactory.newInstance();
  
  Transformer t = tf.newTransformer();
  
  Properties p = t.getOutputProperties();
  // print properties to console
  p.list ( System.out ) ;
  // set up the transformer
  // there are properties to set and error listeners which can be set
  
  // does something when output to the console anyway...
  t.setOutputProperty ( "encoding" , "UTF-16" ) ;
  // set indentation
  t.setOutputProperty ( OutputKeys.INDENT , "yes" ) ;
  // new DOMSource instance
  DOMSource ds = new DOMSource ( doc  );
  // Print Writer
  PrintWriter writer = new PrintWriter( new BufferedWriter ( new FileWriter ( f) ) );  
  StreamResult res = new StreamResult  ( writer ) ;
  // transform
  t.transform ( ds , res ) ;    
 }// end method
}// end class