Validating XML with external dtd without doctype specified in xml

Hi,
I am very new to SAX, DOM and things..but I am really pulling my hair to find the soln., I have tried to search soln but I found many people asking same question but hardly anyone was satisfactory.
My problem is that I have xml file without doctype specified in it, but I have dtd available on my system.
I have tried to set MyEntityResolver which implements EntityResolver in documentBuilder but its only getting called (resolveEntity method of MyEntirtyResolver), only when I add doctype to the xml (which is not what I want) and not when there is no doctype in the xml. I have set "factory.setValidating(true)" and I also have errorHandler in place.
But why EntityResolver is not invoked when its needed most. ie. when doctype is not available in xml ?...it complains that DOCTYPE must match root=null , which is obvious because no DOCTYPE in xml.
code is as follows:
please help me ..if anyone has any idea about this ....
Main class is :
public static void main(String args[]){
          Document document=null;
          ErrorHandler defaultHandler=new MyDefaultHandler();
          String xmlFile="note.xml";
          try{
               System.out.println("Starting...");
             boolean validXML = true;
             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
             factory.setNamespaceAware(true);
             factory.setValidating(true);
             try {
                ExternalResolver er = new ExternalResolver();
// addURL is just a method which sets string in a map to be retrieved by resolveEntiy
                er.addURL("D:\\SAXnDOM\\SAXProject\\note.dtd");
                DocumentBuilder builder = factory.newDocumentBuilder();
                 builder.setEntityResolver(er);
                 builder.setErrorHandler(new MyDefaultHandler());
                builder.parse(new File(xmlFile));
             resolveEntity of ExternalResolver is as follows:
public InputSource resolveEntity(String publicId, String systemId)
               throws SAXException, IOException {
           System.out.println("********resolvedEntity:" +publicId +" and "+systemId +"******");
         if ( urlMap != null && urlMap.get(systemId)!= null ){
             try {
                 return new InputSource(new FileReader(systemId));
             } catch (FileNotFoundException e) {
                 System.out.println("[ERROR] Unable to load entity reference: " + systemId );
         return null;
public void addURL(String filePath) throws MalformedURLException{
          addURL(new File(filePath).toURL());
     public void addURL(URL url) {
         if ( urlMap == null ){
             urlMap = new HashMap();
         urlMap.put(url, null);
     }

Its working.... its working ...
problem was in resolveEntity, that stupid if condition was removed like this:
public InputSource resolveEntity(String publicId, String systemId)
               throws SAXException, IOException {
           System.out.println("********resolvedEntity:" +publicId +" and "+systemId +"******");
            try {
                 return new InputSource("D:\\SAXnDOM\\SAXProject\\note.dtd");
             } catch (Exception e) {
                 System.out.println("[ERROR] Unable to load entity reference: " + systemId );
         return null;
     }Other change is (which I didnt like ) is that in my xml, I had written fake doctype like :
<?xml version="1.0"?>
<!DOCTYPE note SYSTEM "fakenote.dtd">
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
<Prashant>prdfjfdj</Prashant>
</note> in above code fakenote.dtd doesnt exist anywhere ..its just to bypass that doctype:null error.
So my guess is that EntityResolver overrides doctype in the xml and applies its own doctype (note.dtd in this case)
But new proble comes...what if i dont want to add any doctype ..not even fake in xml ?
Hope my stupid mistakes will find someone usefull..

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    I also tried to just validate the XML using queries such as the below, since validating all without the WHERE also caused exception and abortion:
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