Externalizable problems between v1.3 and v1.4

Question

Hej you.
I have strange problems with the Externalizable objects.
I Use many Object to Save my file, but wien i try to Externalizable on J1.3 and Denalizable again in J1.4 I got this message:
E:\Programmer\Java\ProrgamName>Java ProrgamName
javax.swing.JInternalFrame; Local class not compatible: stream classdesc serialV
ersionUID=8792953236056021037 local class serialVersionUID=-6387351733537024688
Can i trap J1.4 ID to use 1.3 ID, so it can use on ALL platforms, not just locally?
When I Save and load on the same machine it works fine, but not when i moving to another machine with 1.4. Is a another method, or i Need to save all object to AscII instead in this smart method (that are poorly work)? I have surfed around javasoft.com with finding a answear.
See my early quenstien on (closed):
http://forum.java.sun.com/thread.jsp?forum=31&thread=273990
With very regaards By:
Super Bomba, Denmark
PS. No Duke Dollars this time. Sorry.

Answer 1

Hey.
I found how to work around combatible problems between 1.3 and 1.4. For user, that want to save thier DynamicTree.java (http://java.sun.com/docs/books/tutorial/uiswing/components/example-swing/index.html)
Use follow code (I using Externalizable):
  protected DefaultMutableTreeNode rootNode=null;
  protected DefaultTreeModel treeModel=null;
  public void writeExternal(ObjectOutput stream) throws IOException
  { stream.writeUTF(rootNode.toString());
    Vector values = new Vector();
    Object root = treeModel.getRoot();
    // Save the root, if its Serializable.
    if(root != null && root instanceof Serializable)
    { values.addElement("root");
      values.addElement(root);
    stream.writeObject(values);
  public void readExternal(ObjectInput stream) throws IOException
  { thisModel.removeAll();
    thisModel.setVisible(false);
    try
    { String title=stream.readUTF();
      rootNode = new DefaultMutableTreeNode(title);
      Vector values = (Vector)stream.readObject();
      int indexCounter = 0;
      int maxCounter = values.size();
      treeModel = new DefaultTreeModel(rootNode);
      if(indexCounter < maxCounter && values.elementAt(indexCounter).equals("root"))
      { TreeNode root = (TreeNode)values.elementAt(++indexCounter);
        treeModel = new DefaultTreeModel(root);
        indexCounter++;
      // kode for setting the tree start here
    catch (ClassNotFoundException e) {}
  }Hope, this is to use :-)
Hi from
Super Bomba