TreeCellRendere updating icons

Question

I have a TreeCellRederer which changes the icons of JTREE when openen/closing items (linked to start/stop applications)
When an item (application) is open and i switch to another item, the icon does not change (correct because app is still running). When i select an item and close the application, the icon is changed correctly (from closed to open and vise versa).
When an item (app3) is open and i switch to another application (app2) and then close the app2, my cursus jumps to item 0 (top level) and the icon of the app2 is closed. Then i close app3 (without selecting it first). Now it is goes wrong, the icon is not changed. This is because the line is not rendered.
I can force closing of the item by jumping to the last item in the list and then to the first item in the list "removeFromActiveApplicationList(String application)" method, but this is a bit of overkill.
The problem is that the item-row is not rendered when application is closed without the item be-ing active. Any idea how to solve this?
I will include all coding but icon-iconimages.
MenuApplication:
package myMenu;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyVetoException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.StringTokenizer;
import java.util.logging.Handler;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import testje.testApp;
import testje.testInternalFrame;
public class MenuTest extends JFrame implements TreeSelectionListener{
    // System Properties
    public static Logger myLogger = Logger.getLogger(MenuTest.class.getName());
    public Handler myHandler = null;
    private static String appName;
    // Variables
    public ArrayList activeApplicationList;
    private Object[] [] data;
    private ArrayList sflData;
    public String selectedApplication;
    // Swing objects and varialbles
    public JDesktopPane myDeskTop;
    private JPanel jContentPane = null;
    private JSplitPane jSplitPane = null;
    private JTree jTree = null;
    private javax.swing.JMenuBar jJMenuBar = null;
    private javax.swing.JMenu fileMenu = null;
    private javax.swing.JMenuItem exitMenuItem = null;
    private boolean packFrame = false;
    private PropertyChangeEvent currentEvent;
    // Applications
    private testApp myPanelTestje;
    private testInternalFrame myFrameTestje;
     * This is the default constructor
    public MenuTest() {
        super();
        initialize();
        setAppName("Test Menu");
     * Launches this application
    public static void main(String[] args) {
         MenuTest myMenu = new MenuTest();
         myMenu.setVisible(true);
     * This method initializes this
     * @return void
    private void initialize() {
        setContentPane(getJContentPane());
        setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        setJMenuBar(getJJMenuBar());
        setSize(800, 600);
        setTitle("MyMenu");
        setVisible(true);
        //Validate frames that have preset sizes
        //Pack frames that have useful preferred size info, e.g. from their layout
        if (packFrame) {
          this.pack();
        else {
          this.validate();
        //Center the window
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension frameSize = this.getSize();
        if (frameSize.height > screenSize.height) {
          frameSize.height = screenSize.height;
        if (frameSize.width > screenSize.width) {
          frameSize.width = screenSize.width;
        setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
     * This method initializes jJMenuBar   
     * @return javax.swing.JMenuBar
    private javax.swing.JMenuBar getJJMenuBar() {
        if (jJMenuBar == null) {
            jJMenuBar = new javax.swing.JMenuBar();
            jJMenuBar.add(getFileMenu());
        return jJMenuBar;
     * This method initializes jMenu   
     * @return javax.swing.JMenu   
    private javax.swing.JMenu getFileMenu() {
        if (fileMenu == null) {
            fileMenu = new javax.swing.JMenu();
            fileMenu.setText("File");
            fileMenu.add(getExitMenuItem());
        return fileMenu;
     * This method initializes jMenuItem   
     * @return javax.swing.JMenuItem   
    private javax.swing.JMenuItem getExitMenuItem() {
        if (exitMenuItem == null) {
            exitMenuItem = new javax.swing.JMenuItem();
            exitMenuItem.setText("Exit");
            exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent e) {   
                    System.exit(0);
        return exitMenuItem;
     * This method initializes jContentPane
     * @return javax.swing.JPanel  
    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(new BorderLayout());
            jContentPane.add(getJSplitPane(), java.awt.BorderLayout.CENTER);
        return jContentPane;
     * This method initializes jSplitPane  
     * @return javax.swing.JSplitPane  
    private JSplitPane getJSplitPane() {
        if (jSplitPane == null) {
            jSplitPane = new JSplitPane();
            jSplitPane.setLeftComponent(getJTree());
            myDeskTop = new JDesktopPane();
            jSplitPane.setRightComponent(myDeskTop);
            jSplitPane.setDividerLocation(150);
        return jSplitPane;
    private JTree getJTree() {
        if (jTree == null) {
            // Create Root
            DefaultMutableTreeNode root = new DefaultMutableTreeNode("Conti7");
            setActiveApplicationList(new ArrayList());
            // Create ApplicationsList
            // Get Applicationlist
            getApplicationList();
            // Process MenuArray to create Menu
            String previousFolder = "";
            DefaultMutableTreeNode newNode = new DefaultMutableTreeNode();
            for (int i = 0; i < sflData.size(); i++){
                myLogger.fine(
                        "Dataline "+i +" =" + data[0] + " | "
+ data[i][1] + " | "
+ data[i][2] + " | "
+ data[i][3] + " | "
+ data[i][4] + " | "
+ data[i][5]);
if (!(((String)data[i][2]).equals(previousFolder))) {
if (!(previousFolder.equals(""))){
root.add(newNode);
previousFolder = (String)data[i][2];
newNode = new DefaultMutableTreeNode(previousFolder);
newNode.add(new DefaultMutableTreeNode(data[i][3]));
if (!previousFolder.equals("")){
root.add(newNode);
// Add Full menu to tree
jTree = new JTree(root);
jTree.setCellRenderer(new TreeExRenderer());
jTree.addTreeSelectionListener(this);
return jTree;
public void valueChanged(TreeSelectionEvent event) {
String selectedApplication = jTree.getLastSelectedPathComponent().toString();
myLogger.info(
"Current Item Selection = " + selectedApplication);
setSelectedApplication(selectedApplication);
activateApplication(selectedApplication);
private void activateApplication(String selectedApplication) {
if (getSelectedApplication().equals("PanelTestje")){
if (myPanelTestje==null){
myPanelTestje = new testje.testApp();
addInternalFrame(myPanelTestje);
activateInternalFrame(myPanelTestje);
if (getSelectedApplication().equals("FrameTestje")){
if (myFrameTestje==null){
myFrameTestje = new testje.testInternalFrame();
addInternalFrame(myFrameTestje);
activateInternalFrame(myFrameTestje);
public void addInternalFrame(JInternalFrame myFrame) {
myDeskTop.add(myFrame);
myFrame.pack();
myFrame.setClosable(true);
try {
myFrame.setMaximum(true);
} catch (PropertyVetoException e){}
myFrame.addPropertyChangeListener(new PropertyChangeHandler());
activeApplicationList.add(getSelectedApplication());
Collections.sort(activeApplicationList);
public void activateInternalFrame(JInternalFrame myFrame) {
myFrame.setVisible(true);
myFrame.toFront();
class PropertyChangeHandler implements PropertyChangeListener {
public void propertyChange(PropertyChangeEvent e) {
if (((String)e.getPropertyName()).equals("closed")){
setCurrentEvent(e);
deActivateApplication(e);
private void deActivateApplication(PropertyChangeEvent currentEvent){
if ((getCurrentEvent().getSource() instanceof testje.testApp)){
myPanelTestje = null;
removeFromActiveApplicationList("PanelTestje");
if ((getCurrentEvent().getSource() instanceof testje.testInternalFrame)){
myFrameTestje = null;
removeFromActiveApplicationList("FrameTestje");
* Deze methode wordt gebruikt om de applicatienaam op
* te vragen.
* <p>
* @return appName : appName Objectvalue.
public static String getAppName() {
return appName;
* Deze methode wordt gebruikt om de applicatie af te sluiten
* nadat eerst connectieObject wordt afgesloten.
* <p>
public static void exitApplication() {
myLogger.info("End application.");
System.exit(0);
private static void setAppName(String appName)
MenuTest.appName = appName;
public class TreeExRenderer extends DefaultTreeCellRenderer {
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,
row, hasFocus);
String nodeName = value.toString();
ImageIcon main_leaf = createImageIcon("/images/jTreeRoot.gif");
ImageIcon main_open = createImageIcon("/images/jTreeRoot.gif");
ImageIcon main_close = createImageIcon("/images/jTreeRoot.gif");
ImageIcon leafIcon = createImageIcon("/images/jTreeFolderClosed.gif");
ImageIcon leafOpen = createImageIcon("/images/jTreeFolderOpen.gif");
ImageIcon leafClosed = createImageIcon("/images/jTreeFolderClosed.gif");
ImageIcon leafSelected = createImageIcon("/images/jTreeItemSelected.gif");
ImageIcon leafActivated = createImageIcon("/images/jTreeItemSelected.gif");
if (row==0){
setIcon(main_leaf);
} else {
if(sel){
setIcon(leafSelected);
} else {
if (!expanded) {
if (isApplicationInActiveList(nodeName)){
setIcon(leafActivated);
} else {
setIcon(leafClosed);
}else{
setIcon(leafOpen);
return this;
public ImageIcon createImageIcon(String path) {
URL imgURL = MenuTest.class.getResource(path);
URL imgURL1 = MenuTest.class.getResource(path);
if ((imgURL != null)) {
return new ImageIcon(imgURL);
} else if ((imgURL == null)) {
return new ImageIcon(imgURL1);
} else {
System.out.println("Hello ");
System.err.println("Couldn't find file: " + path);
return null;
private ArrayList getActiveApplicationList()
return activeApplicationList;
private void setActiveApplicationList(ArrayList activeApplicationList)
this.activeApplicationList = activeApplicationList;
private boolean isApplicationInActiveList(String nodeName)
if (activeApplicationList.indexOf(nodeName)>-1) {
return true;
} else {
return false;
public void removeFromActiveApplicationList(String application)
activeApplicationList.remove(activeApplicationList.indexOf(application));
// jTree.setSelectionRow((jTree.getRowCount())-1);
jTree.setSelectionRow(0);
public String getSelectedApplication()
return selectedApplication;
private void setSelectedApplication(String selectedApplication)
this.selectedApplication = selectedApplication;
public PropertyChangeEvent getCurrentEvent()
return currentEvent;
private void setCurrentEvent(PropertyChangeEvent currentEvent)
this.currentEvent = currentEvent;
private void getApplicationList() {
sflData = new ArrayList();
// Get Applicationlist
sflData.add("PGO;50;General;App1;pack.myApp1;Application 1");
sflData.add("PGO;55;Operational;App2;pack.myApp2;Application 2");
sflData.add("PGO;60;Operational;App3;pack.myApp3;Application 3");
sflData.add("PGO;65;Expeditie;PanelTestje;testje.Paneltestje;Expeditie Paneltestje");
sflData.add("PGO;70;Desktop;App4;pack.myApp4;Application 4");
sflData.add("PGO;75;Manifest;FrameTestje;testje.FrameTestje;Maritiem FrameTestje");
sflData.add("PGO;80;Desktop;App5;pack.myApp5;Application 5");
// Convert applicationlist to MenuArray
data = new Object[sflData.size()][6];
for (int i = 0; i < sflData.size(); i++){
int count = 0;
String str;
str = (String)sflData.get(i);
StringTokenizer token = new StringTokenizer(str,";");
while (token.hasMoreTokens()){
data [i] [count] = token.nextToken();
count++;
*testapp1*package testje;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
* @author pgo
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
public class testApp
extends JInternalFrame {
     testPanel p;
Container c;
boolean packFrame = false;
     public testApp() {
          super("Swing-Toepassing PanelTestje");
          c = getContentPane();
c.setLayout(new BorderLayout());
          p = new testPanel();
          c.add(p);
//setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setVisible(true);
//Validate frames that have preset sizes
//Pack frames that have useful preferred size info, e.g. from their layout
if (packFrame) {
this.pack();
else {
this.validate();
// addWindowListener(new WindowAdapter() {
// public void windowClosed(WindowEvent e) {
// System.exit(0);
     public static void main(String[] args) {
          // final JFrame f = new testApp();
// new testApp();
*testInternalFrame*/*
* Created on 19-apr-2007
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
package testje;
import javax.swing.*;
import java.awt.*;
* @author pgo
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
public class testInternalFrame extends JInternalFrame {
     public void testInternalFrame(){
          setBackground(Color.white);
          Container contentPane = getContentPane();
          setLocation(20,20);
          setTitle("Internal Frame");
          setClosable(true);
          setResizable(true);
          setMaximizable(true);
          setIconifiable(true);
          setVisible(true);
          contentPane.setLayout(new FlowLayout());
          contentPane.add(new JTextArea(5,15), "Center");
          pack();
*testPanel*/*
* Created on 19-apr-2007
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
package testje;
import javax.swing.*;
import java.awt.*;
* @author pgo
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
public class testPanel extends JPanel {
     public void testPanel(){
          setBackground(Color.blue);
     public void paintComponent (Graphics g){
          super.paintComponent(g);
          g.drawString("Groeten van Patrick", 0, 60);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Answer 1

When you say "the JLabel changes" I'm guessing you mean that the JLabel variable named "imageLabel" was the thing that changed? That won't change the GUI's reference to the original JLabel object.
Which is what you have to change. You have a reference to that object in the form of the "imageLabel" variable; to change the object you call one of its methods, like maybe setIcon() or something... whatever your ImageManager class is doing to create the label in the first place.