Help with JTree Update

Question

Hi there,
I need to do a simple thing with a JTree but I 've got a problem. Well I want to create a very very very simple bookmark function. I have a tree with the children and I want to add new children which are going to work like link for my program. I try to add new children the same way I created them but it's not working. I tried also the updateUI method that somebody mentioned in an other topic but still nothing. Can somebody help?
Here is the Bookmark Panel code:
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
public class BookmarkTry implements TreeSelectionListener {
    private JScrollPane scrollPane;
    private JLabel label;
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Bookmarks");
    private JTree tree;
    private JPanel panel = new JPanel();
     public BookmarkTry(){
     public JPanel createpanel(){
     tree = new JTree(root);
     root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 1","about.html")));
    root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 2","aaa.html")));
    root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 3","sdss.html")));
    // build tree
    tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    tree.addTreeSelectionListener(this);// get selection events!
    // build form
    scrollPane = new JScrollPane(tree);
    label = new JLabel(" ");
    //scrollPane.setViewportView(tree);
    panel.add(label);
    panel.add(scrollPane);
    return panel;
    public void addBookMarks(String name, String page){
         root.add(new DefaultMutableTreeNode(new Bookmark(name,page)));
         //DefaultTreeModel.reload();
    public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
        DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
        if ((selectedNode!=null)&&(selectedNode.isLeaf())) {
            Bookmark b = (Bookmark)selectedNode.getUserObject();
            label.setText("Go to page "+b.getPage());
    private static class Bookmark {
        private String caption;
        private String page;
        public String getPage() {
            return page;
        public Bookmark(String caption, String page) {
            this.caption = caption;
            this.page = page;
        public String toString() {
            return caption;
     and here how I try to add the node :
void jButton1_actionPerformed(ActionEvent e) throws java.sql.SQLException {
        DefaultMutableTreeNode book = null;
        System.out.println("You pressed the add button of bookmarkframe");
        //Bookmark.getTreePanel().addObject(name.getText());
        //book = new DefaultMutableTreeNode(new BookInfo(name.getText(),page.getText()));
        System.out.println(name.getText());
        System.out.println(page.getText());
        tempb.addBookMarks(name.getText(),page.getText());
        frame.dispose();
   } //void jButton1_actionPerformedIt doesn't add the new node in my JTree
Thanks in advance

Answer 1

I still suspect you have two (or more) new BookmarkTry() executions somewhere. But I can't see all of your code here of course. My standard reply, so we don't waste time guessing:
1) In the future, Swing related questions should be posted in the Swing forum.
2) If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its original formatting.
Note, we don't want your whole application. We want an SSCCE!