Error in a Class Cast

[João Sarraipa <jfss@uninova.pt>]

Hi!

 

I have the following exception....

exception java.lang.ClassCastException: org.apache.crimson.tree.XmlDocument

when I try make A class cast from org.w3c.dom.Document to com.sun.tree.xml.XmlDocument

 

The code:

 

(...)

 

private DocumentBuilderFactory m_documentBuilderFactory = DocumentBuilderFactory.newInstance();

 

  /** */
  private DocumentBuilder m_documentBuilder;

 

(...)

    try {
      m_documentBuilder = m_documentBuilderFactory.newDocumentBuilder();
    } catch (Exception e) {
      throw new RuntimeException(e.getMessage());

    }

 

(...)

    Document returnDoc = null;
    Node tempNode =  msg.getContent();
    

    tempNode = FIPA.ACL.Util.getNode(tempNode, FIPAConstants.Apply);

    if (FIPAConstants.Action.equals(tempNode.getFirstChild().getNodeName())) {
      tempNode = FIPA.ACL.Util.getNode(tempNode, FIPAConstants.Apply);
     
      // checks whether it is really a forward action ...
      String messageType = tempNode.getFirstChild().getFirstChild().getFirstChild().getNodeValue();

      if (messageType.indexOf(FIPAConstants.Forward) >= 0 ) {
        
        tempNode = Util.getNode(tempNode, FIPAConstants.Message );

        if (tempNode == null) {
          System.out.println("ACC: message content is null !!");
        }

 

        returnDoc = m_documentBuilder.newDocument();

        try {
          Node copy = tempNode.cloneNode(true);
          com.sun.xml.tree.XmlDocument xmlD=(com.sun.xml.tree.XmlDocument) returnDoc;    ***********Localization of ERROR **************
          xmlD.changeNodeOwner(copy);
          returnDoc.appendChild(copy); //aha

        } catch (Exception e) {
          System.out.print("ACC: caught exception "+e.toString()+"\n");
          e.printStackTrace() ;

        }

 

 

 

Can you help me?

 

Thanks in advanced.

 

João Sarraipa