Getting ClassCastException

[Devarakonda Srikanth]

I am trying to replace a tag in existing jrxml file and i am successful in doing so by parsing the file through DOM. But when I am trying to write the same modified document which is in DOM object, I am getting the following exception:

java.lang.ClassCastException: org.apache.xerces.dom.DeferredElementImpl cannot be cast to com.sun.xml.tree.ElementNode
at com.Replace_Tag.replaceNode(Replace_Tag.java:100)
at com.Replace_Tag.processRequest(Replace_Tag.java:40)
at com.Replace_Tag.doGet(Replace_Tag.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

Here I am providing the code I am using:

    
public void replaceNode() throws Exception{
        
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        java.io.File source = new java.io.File("newLinechart.jrxml");
        Document doc = db.parse("file:/C:/Documents and Settings/srikanth.d.KNOAHSOFT/Desktop/Linechart.jrxml");
 
        Element root = doc.getDocumentElement();
        Element newElement = doc.createElement("stackedBarchart");
 
        NodeList oldNode = doc.getElementsByTagName("lineChart");
        int listLength = oldNode.getLength();
 
        for(int i=0;i<listLength;i++){
 
            Node parentNode = oldNode.item(i).getParentNode();
            Node replaced = parentNode.replaceChild(newElement, oldNode.item(i));
 
        }
        
        FileWriter dest = new FileWriter(source);
        com.sun.xml.tree.ElementNode ele = (com.sun.xml.tree.ElementNode)root;
        
        ele.write(dest);
        
        dest.flush();
        dest.close();
     }

can anybody help me in this regard??