java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.DocumentImpl

Hi I am getting following exception while appending child node to the element.

The exception comes only in JRE 1.5 i have tested the code and with JRE 6 Its working fine.

Bellow is the stacktrace

import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.Calendar;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.w3c.dom.Document;
[b]import org.w3c.dom.Element;[/b]
import org.w3c.dom.NodeList;
import org.w3c.dom.ProcessingInstruction;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import com.interactcrm.alarm.tree.TreeManager;
import com.interactcrm.utils.Utility;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
...
...
...
private void appendNode(String nodeString) throws IOException, ParserConfigurationException, SAXException, TransformerException{
		/*
		 * If nodeString is the first alarm of the day.
		 * createFolder() will create a today's folder.
		 */
		createFolder();
		String filePath = projectHome + File.separator + "AlertFiles" + File.separator + getTodaysFolderName() + File.separator + getFileName();
		File 					file 		= null;
		DocumentBuilderFactory 	factory 	= null;
		DocumentBuilder 		builder 	= null;
		InputSource 			is 			= null;
		Document 				doc 		= null;
		File 					xsltFile 	= null;
		Source 					xsltSource 	= null;
		try{
			file = new File(filePath);
			factory = DocumentBuilderFactory.newInstance();
		    builder = factory.newDocumentBuilder();
		    is = new InputSource(new StringReader(nodeString));
		    doc = builder.parse(is);
		    processingInstruction = doc.createProcessingInstruction("xml-stylesheet", "type=\"text/xsl\" href=\"" + xsltLocation + "\"");
		    doc.appendChild(processingInstruction);
		    Element [b]newChildElement [/b]= (Element) doc.getDocumentElement();
		    xsltFile = new File(xsltLocation);
		    xsltSource = new StreamSource(xsltFile);
		    if (file.exists()){
				/*
				 * File Already exist. Create DOM and append the element 
				 */
				DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			    DocumentBuilder db = dbf.newDocumentBuilder();
			    Document document = db.parse(filePath);
			    NodeList nodeList = document.getElementsByTagName("alarm");
			    int alarmCount = nodeList.getLength();
			    /*
			     * Check the total number of alarm in the existing xml file.
			     * If the total number of alarm is > max allowed alarm then 
			     * rename the file. and create a new alarm file, and
			     * append the new alarm to the newly created xml file.
			     */
			    if (alarmCount  >= maxAlarm){
			    	renameFile(file);
			    	createNewAlarmFile(file,[b]newChildElement[/b]);
			    }else{
			    	Element element = (Element) document.getDocumentElement();
				    element.appendChild(document.adoptNode(newChildElement));
				    TransformerFactory tf = TransformerFactory.newInstance();
				    Transformer trans = tf.newTransformer();
				    trans.transform(new DOMSource(document), new StreamResult(file));
			    }
			}else{
				createNewAlarmFile(file,[b]newChildElement[/b]);
			}
...
...
...
...
...
private void createNewAlarmFile(File file,Element [b]newChildElement[/b]){
		try{
			File xsltFile = new File(xsltLocation);
			Source xsltSource = new StreamSource(xsltFile);
			System.out.println("File path : " + file.getAbsolutePath());
			file.createNewFile();
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		    DocumentBuilder db = dbf.newDocumentBuilder();
		    Document document = db.newDocument();
		    processingInstruction = document.createProcessingInstruction("xml-stylesheet", "type=\"text/xsl\" href=\"" + xsltLocation + "\"");
			document.appendChild(processingInstruction);
		    Element documentElement = document.createElement("alarm-anywhere");
		    [color=red]documentElement.appendChild(document.adoptNode([b]newChildElement[/b]));[/color]
		    document.appendChild(documentElement);
		    
		    TransformerFactory tf = TransformerFactory.newInstance();
		    Transformer trans = tf.newTransformer();
		    trans.transform(new DOMSource(document), new StreamResult(file));
		}catch(Exception e){
			e.printStackTrace();
		}
	}

has anybody got the same issue like this before. It seems like there is some issue with JRE 1.5 because the code program works fine with JRE 6

And if its an issue with JRE how can i fix it ?

I have search for the Class com.sun.org.apache.xerces.internal.dom.DocumentImpl And i have figured out that its in