XML - JTree RMI

Question

Hi Friends,
I am a beginner in RMI. I am trying to develop a JTree with following functionalities for XML file reading and writing
1) generating TreeNode from String
2) generating String from TreeNode
Both of this functions I want to keep at Server and want to invoke using RMI.
Following is the code:
public interface XTreeIF
    extends Remote {
    public DefaultMutableTreeNode createTreeNode(String xmlText)
            throws RemoteException;
   public String createXmlString(DefaultMutableTreeNode rootNode)
            throws RemoteException;
public class RemoteXTree
     extends UnicastRemoteObject
     implements XTreeIF {
  public DefaultMutableTreeNode createTreeNode(String text)
            throws RemoteException {
                     DefaultMutableTreeNode treeNode;
     treeNode = createTreeNode(parseXml(text));  //function for creating treenode
     return _treeNode;
   public String createXmlString(DefaultMutableTreeNode treeNode)
            throws RemoteException {
     StringBuffer xml = new StringBuffer();
     xml.append("<?xml version=\"1.0\" ?>");
     xml.append(createXmlNodes(treeNode));  //function for creating xml nodes
     return xml.toString();
}I am getting error on the client side as:
java.rmi.UnmarshalException: Error unmarshaling return header;
Can anyone please suggest what may be the problem and how to sort it out.

Answer 1

Hi Mr.Nitin,
print the stak trace and I can you help.
Bye.