Serialization giving probem with HashMap

[peter peter]

Hi,

   I am creating a new document and could serialize it without fail.

 

 But if I add the created document to the HashMap. and then get the document from hashMap and try to serialize, OutputFormat throws NullPointerException,

 

Here's the exception message---

 

/*

java.lang.NullPointerException
        at org.apache.xml.serialize.OutputFormat.whichMethod(Unknown Source)
        at org.apache.xml.serialize.OutputFormat.<init>(Unknown Source)*/

 

Here's the code I am using--->

 

 HashMap documentsMap = new HashMap();
 Document doc= new DocumentImpl();
 Element root = doc.createElement("person");     // Create Root Element
 Element item = doc.createElement("name");       // Create element
 item.appendChild( doc.createTextNode("Jeff") );
 root.appendChild( item );                       // Attach another Element -   doc.appendChild( root );                        // Add Root to Document

//add to the HashMap....
documentsMap.put("node1",doc );
  try
  {
   Iterator iterator = documentsMap.entrySet().iterator();
   while (iterator.hasNext() )
   {
      Object key = iterator.next();
      doc= (Document)taxonomyNodesMap.get(key);
      OutputFormat format  = new OutputFormat( doc );   //Serialize DOM
      StringWriter  stringOut = new StringWriter();        //Writer will be a  

     XMLSerializer    serial = new XMLSerializer( stringOut, format );
    serial.asDOMSerializer();                            // As a DOM Serializer
    serial.serialize( doc.getDocumentElement());
   }
  }catch......

 

Any help will be greatly appreciated..

 

Regards,

Peter

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