Changed behaviour of setCursor in JTree

Question

since Java HotSpot(TM) Client VM (build 1.4.2_02-b03, mixed mode) there seems to be a change in setCursor in JTree.
I set a wait cursor in treeWillExpand, and reset it in treeExpanded. This works fine with that version of the jre. With a newer one, e.g. Java HotSpot(TM) Client VM (build 1.4.2_08-b03, mixed mode), the wait cursor is reset to the default cursor shortly after treeWillExpand, and before the call of treeExpaned.
I will add a short piece of code to reproduce that behaviour. Just collapse the root node and expand it again.
Might that be a bug in the jvm or is there a misstake in the code?
import java.awt.Cursor;
import javax.swing.JDialog;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeWillExpandListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.ExpandVetoException;
public class Tester extends JDialog implements TreeExpansionListener,
          TreeWillExpandListener {
     private JTree tree = new JTree();
     private JScrollPane spTree = new JScrollPane(tree);
     private DefaultTreeModel model;
     // used to "simulate" some work
     boolean isExpanding = false;
     public void treeWillCollapse(TreeExpansionEvent event)
               throws ExpandVetoException {
     public void treeWillExpand(TreeExpansionEvent event)
               throws ExpandVetoException {
          System.err.println("treeWillExpand");
          tree.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
          // "simulate" some work during expand
          isExpanding = true;
     public void treeCollapsed(TreeExpansionEvent event) {
     public void treeExpanded(TreeExpansionEvent event) {
          System.err.println("treeExpanded");
          tree.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
          // work is done and cached
          isExpanding = false;
     public Tester() {
          setModal(true);
          setSize(640, 480);
          this.getContentPane().add(spTree);
          tree.addTreeExpansionListener(this);
          tree.addTreeWillExpandListener(this);
          MyTreeNode root = new MyTreeNode("root");
          model = new DefaultTreeModel(root);
          root.add(new MyTreeNode("test1"));
          root.add(new MyTreeNode("test2"));
          root.add(new MyTreeNode("test3"));
          tree.setModel(model);
          tree.setShowsRootHandles(true);
          setVisible(true);
          System.exit(0);
     public static void main(String[] args) {
          new Tester();
     class MyTreeNode extends DefaultMutableTreeNode {
          public MyTreeNode(String text) {
               super(text);
          public int getChildCount() {
               if (isExpanding) {
                    System.err.println("getChildCount");
                    try {
                         Thread.sleep(200);
                    } catch (InterruptedException e) {
               return super.getChildCount();
}

Answer 1

I think it is reset when you release the mouse button. If you keep the button down, it works as usual.