JTree Refesh problem

Question

Hello --
I've searched this subject ad nauseum on these forums and the rest of the web, and I'm still coming up blank.
Basically, I have a file structure JTree. To do a "refresh" view, I basically kill the original object, and rebuild it again -- while first storing the last TreePath the user was on.
Since this tree is built dynamically, placeholders are used to tell if the parent node has any children. From there, it looks up its children.
During the refresh, I fire the tree.expandPath(path), and in my expansion listener, it should take care of the rest.
Well, it seems like all the steps are going correctly, due to the debug output I'm getting, but I can't get the tree to scroll to the path. Here's the reload part:
public void refreshTree(TreePath path){
   TP tp = null;
   Object [] obj = path.getPath();
     for (int i = 2; i <= obj.length; i++){
          tp = new TP(obj, i);     
         tree.expandPath(tp.getTP());
//I've tried these in the for loop to no avail
//               tree.setSelectionPath(tp.getTP());
//              tree.scrollPathToVisible(tp.getTP());
       //this should be the last and final TreePath object
     tree.expandPath(tp.getTP());
     //tree.getSelectionModel().setSelectionPath(tp.getTP());
          tree.setSelectionPath(tp.getTP());
     tree.scrollPathToVisible(tp.getTP());
     //this class exists so I can build the treepath one
        //leaf at a time
     class TP extends TreePath{
          public TP(Object[] obj, int length){
               super(obj, length);     
          public TreePath getTP(){
               return this;
     }I've tried rebuild and all, and it seems like everything is doing what it's supposed to except drawing it right. Here's the code for the expansion:
class selectionListener implements TreeExpansionListener{
   public void treeExpanded(TreeExpansionEvent evt){
     DefaultMutableTreeNode node = getTreeNode(evt.getPath());
     TreeNode firstBorn = node.getFirstChild();
     if (firstBorn.toString().equals(PLACEHOLDER)){
          System.out.println("made it");  //debug
          populateTree(evt.getPath());  //this gets the new stuff
  public void treeCollapsed(TreeExpansionEvent evt){}          
}So, again, it seems like everything is firing the way it should, it's just not redrawing the tree to the current path.
I'm on Java 1.4[02], Windows 2K, and JTree is set to SINGLE selection mode. If you need any additional information, please let me know.
Thank you very much for your time.
-Steve

Answer 1

It seems that the tree is firing a node change itself, because I have code executing in the
public void treeExpanded(TreeExpansionEvent evt)
function.
I also put a bit of debug code in... I have
System.out.println("Is collapsed? " + tree.isCollapsed(tp.getTP()));
Inside my for loop... the output is false everytime.
So it seems that everything exists, it's just not repainting the gui for some reason or other. I'm not spinning off seperate threads to do anything, so I'd assume it's not a thread problem.
Any ideas? This is really getting frustrating, for something I thought would be so simple.