JTree/JTable not reflecting database when change is done

I'm building an rss application using a hsql database. I'm stuck in updating the JTree when I made changes to a database table. I'm displaying the feed list and when I delete a feed in the database, the JTree is not refreshed. I've looked everywhere and tried all sorts of methods, but to avail. I also tried to create a custom model.

This is the code declaring the JTree. The JTree is inside a ScrollPane. In short, the class initializes the swing components. I'm using DefaultTreeModel for the model in JTree.

Code:

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public Gui() {
                super(new GridBagLayout());

                .... //Some code initializing components

                //Create the nodes.
                top = new DefaultMutableTreeNode("RSS");
                createNodes(top);
                feedTree = new JTree(new DefaultTreeModel(top));
                feedTree.setEnabled(true);
                feedTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
                feedTree.setRootVisible(false);
                feedTree.addTreeSelectionListener(new TreeSelectionListener() {
                        public void valueChanged(TreeSelectionEvent e) {
                                selectedNode = (DefaultMutableTreeNode)feedTree.getLastSelectedPathComponent(); //selectedNode is already declared and initialized.
                                selectedTreePath = feedTree.getSelectionPath();

                                if (selectedNode == null) return;

                                Object nodeInfo = selectedNode.getUserObject();
                                if (selectedNode.isLeaf()) {
                                        //ArticleInfo info = (ArticleInfo)nodeInfo;
                                        displayURL(nodeInfo.toString());  //This displays the entries of the feed in a JEditorPane
                                }
                                if (DEBUG) {
                                        System.out.println(nodeInfo.toString());
                                }
                        }});

                //Create the scroll pane and add the tree to it.
                feedView = new JScrollPane(feedTree);

                ... //more codes that initializes other components

                inSplit = createInSplitPane(articleView, htmlView); //inSplit is a JSplitPane that contains a JTable and JEditorPane, both are contained in their individual JScrollPanes

                outSplit = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, feedView, inSplit); //outSplit is a JSplitPane that contains the JScrollPane containing the tree and the inSplit
                outSplit.setOneTouchExpandable(true);
                outSplit.setDividerLocation(180);

                //Provide minimum sizes for the two components in the split pane
                inSplit.setMinimumSize(new Dimension(100, 50));
                feedView.setMinimumSize(new Dimension(100, 30));

                //Add the split pane to this frame
                c.weightx = 0.5;
                c.fill = GridBagConstraints.BOTH;
                c.gridx = 0;
                c.gridy = 0;
                c.anchor = GridBagConstraints.CENTER;
                c.weighty = 0.5;
                add(outSplit,c);
        }

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Here's a hierarchy of the application GUI (sorry that it's kinda messy):
JFrame
a. JPanel
a1. JSplitPane
a1a. JScrollPane
a1a1. JTree
a1b. JSplitPane
a1b1. JScrollPane
a1b1a. JTable
a1b2. JScrollPane
a1b2a. JEditorPane

This is the code that create the nodes during start-up.

Code:

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private void createNodes(DefaultMutableTreeNode top) {
                DefaultMutableTreeNode feed = null;
                DefaultMutableTreeNode article = null;

                try {
                        ResultSet r1 = db.getFeedList(); //This queries the list of feeds from the database
                        while(r1.next()) { //Create the nodes from the query result
                                feed = new DefaultMutableTreeNode(r1.getString("feed_name"));
                                top.add(feed);
                        }
                } catch (SQLException e1) {
                        JOptionPane.showMessageDialog(getJFrame(),
                                        "SQLException2: " + e1.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
                } catch (ClassNotFoundException e1) {
                        JOptionPane.showMessageDialog(getJFrame(),
                                        "ClassNotFoundException: " + e1.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
                }
        }

---

This is the code when I click on "Delete Feed" button:

Code:

---

deleteButton.addActionListener(new ActionListener() {
                                public void actionPerformed(ActionEvent arg0) {
                                        try {
                                                //Remember I said I initialized the selectedNode outside the constructor? It's for getting the feed title to delete.
                                                if (selectedNode == null) { System.out.println("trying");return;}
                                                Object nodeInfo = selectedNode.getUserObject();
                                                if (selectedNode.isLeaf()) {
                                                        //The next three lines is deleting the feed in the database
                                                        String s = nodeInfo.toString();
                                                        int i = db.getFeedId(s);
                                                        db.deleteFeed(i);

                                                  ((DefaultTreeModel)feedTree.getModel()).removeNodeFromParent(selectedNode);
                                                        //The last thing I tried was re-create the JTree, but I don't know how to reinitialize it in the scrollpane.  As you can see, I even recreate the TreeSelectionListener.
                                                        createNodes(top);
                                                        feedTree = new JTree(new DefaultTreeModel(top));
                                                        feedTree.setEnabled(true);
                                                        feedTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
                                                        feedTree.setRootVisible(false);
                                                        feedTree.addTreeSelectionListener(new TreeSelectionListener() {
                                                                public void valueChanged(TreeSelectionEvent e) {
                                                                        selectedNode = (DefaultMutableTreeNode)
                                                                        feedTree.getLastSelectedPathComponent();
                                                                        selectedTreePath = feedTree.getSelectionPath();

                                                                        if (selectedNode == null) return;

                                                                        Object nodeInfo = selectedNode.getUserObject();
                                                                        if (selectedNode.isLeaf()) {
                                                                                displayURL(nodeInfo.toString()); //Again, displayURL is to display the entries in the JEditorPane
                                                                        }
                                                                        if (DEBUG) {
                                                                                System.out.println(nodeInfo.toString());
                                                                        }
                                                                }});
                                                        if(!feedTree.isEnabled())
                                                                feedTree.setEnabled(true);
                                                      //As you can see, I'm tried all kinds of reload/repaint/revalidate to every component I can find the methods for
                                                        ((DefaultTreeModel)feedTree.getModel()).reload();
                                                        //frame.repaint();
                                                        //((DefaultTreeModel)feedTree.getModel()).reload();
                                                        //feedView.repaint();
                                                        //feedView.revalidate();
                                                }
                                        } //some catch statements
                                }});

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I'm really sorry for the messy code and other things that are messy. I'm really stuck and I'm trying to meet my deadline. I have been staring at the code for three days with little sleep. Please help!!! =(

I don't even know where to start debugging, since there's no error compiling. I'm having the same problem with JTable. I know that these components are just displaying a view of the data, and the model is the one that controls the data. But HOW do I get the component to refresh???!!! Please, Please, Please help!!! Thank YOU so MUCH!!!