JTree nodes not updating

Question

I have a JTree which the nodes are changed from within an actionPerfomed method. However, they are not updating on the screen until a user clicks on a node. Also, the length of the selection box does not change on the tree, so text can be clipped. The code from my actionPerformed is as follows
DefaultMutableTreeNode node = findObjectInTree( event.getOriginalObject() );
if ( node != null ) {
node.setUserObject( event.getObject() );
DefaultTreeModel model = ( DefaultTreeModel ) titleTree.getModel();
model.nodeChanged( node );
TreePath path = new TreePath( node.getPath() );
titleTree.scrollPathToVisible( path );
titleTree.setSelectionPath( path );

Answer 1

I'm not sure what that 'event.getOriginalObject()' stuuf is, but maybe this will helpimport java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
public class Test3 extends JFrame implements Runnable {
  Vector nodes = new Vector();
  DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
  DefaultTreeModel dtm = new DefaultTreeModel(root);
  JTree jt = new JTree(dtm);
  Random r = new Random();
  int nodeCount=0;
  public Test3() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    addNodes(root,0);
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    setSize(400, 400);
    new Thread(this).start();
  private void addNodes(DefaultMutableTreeNode parent, int level) {
    int cnt = r.nextInt(3)+5-level;
    for (int i=0; i<cnt; i++) {
      DefaultMutableTreeNode node = new DefaultMutableTreeNode("Node"+nodeCount++);
      parent.add(node);
      nodes.add(node);
      addNodes(node, level+1);
  public static void main(String[] args) { new Test3().setVisible(true); }
  public void run() {
    while (true) {
      try { Thread.sleep(2000); } catch (Exception e) {}
      DefaultMutableTreeNode randNode = (DefaultMutableTreeNode)
                                     nodes.get(r.nextInt(nodes.size()));
      randNode.setUserObject(randNode.getUserObject()+"!");
      dtm.nodeChanged(randNode);
      TreePath tp = new TreePath(randNode.getPath());
      jt.scrollPathToVisible(tp);
      jt.setSelectionPath(tp);
}