Jdeveloper - GUI not visible in the visual design editor

Question

Hello everybody!
Actually I'm designing a Java Desktop Application with javax.swing. using JDeveloper 11g Release 1 (Studio Edition Version 11.1.1.3.0, Build JDEVADF_11.1.1.3.PS2_GENERIC_100408.2356.5660), Java Platform 1.6.0_18 and Oracle IDE 11.1.1.3.37.56.60 on Linux.
My question is related to JDevelopers visual design editor. Most of my forms extend javax.swing.JInternalFrame. Those forms are visible within the visual design editor but for some of my forms I had to create a subclass of JInternalFrame named ITMSInternalFrame.
package itms.view;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JInternalFrame;
public class ITMSInternalFrame extends JInternalFrame {
    private MainWindow mainWindow;
    private JButton btnExit;
    protected static final ImageIcon ICOCOMMIT =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/commit-icon.png"));
    protected static final ImageIcon ICOROLLBACK =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/rollback-icon.png"));
    protected static final ImageIcon ICOINSERT =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/add-icon.png"));
    protected static final ImageIcon ICOUPDATE =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/page-edit-icon.png"));
    protected static final ImageIcon ICODELETE =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/delete-icon.png"));
    protected static final ImageIcon ICOUSER =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/user-icon-16x16.png"));
    protected static final ImageIcon ICOWAPPEN =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/wappen-icon.png"));
    protected static final ImageIcon ICOPRINT =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/printer-icon-16x16.png"));
    protected static final ImageIcon ICOPRINTPREVIEW =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/find-icon.png"));
    protected static final ImageIcon ICOITSET =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/folder-Options-icon-16x16.png"));
    protected static final ImageIcon ICOREALESTATE =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/real-estate-icon-16x16.png"));
    protected static final ImageIcon ICOBUILDING =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/building-icon-16x16.png"));
    protected static final ImageIcon ICOROOM =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/room-icon-16x16.png"));
    protected static final ImageIcon ICOPROCESS =
        new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/process-icon-16x16.png"));
    public ITMSInternalFrame(MainWindow mainWindow, String title,
                             String path) {
        this.mainWindow = mainWindow;
        this.setLayout(null);
        this.setTitle(title);
        setFrameIcon(new ImageIcon(ITMSInternalFrame.class.getResource(path)));
        this.addInternalFrameListener(this.mainWindow);
    public MainWindow getMainWindow() {
        return this.mainWindow;
    public JButton getExitButton() {
        btnExit = new JButton();
        btnExit.setIcon(new ImageIcon(ITMSInternalFrame.class.getResource("grafiken/home-icon.png")));
        btnExit.setToolTipText("Closes this window");
        btnExit.setActionCommand("Exit");
        btnExit.addActionListener(this.mainWindow);
        return btnExit;
}The forms that extend ITMSInternalFrame are not visible within JDevelopers visual editor. It says "No GUI selected. Double click on an item in the Structure Window to see its GUI here" and in the UI - Log it tells me "Unable to instantiate live instance for btnExit; using placeholder object instead."
I've used Google to find an answer and I've read certain tips about it in different forums but non of that used to help me. So please, does anyone of guys around here know what to do to solve this?
I look forward to receiving your advice on this matter.
Yours sincerely.
Florian W.

Answer 1

Hi,
I remember GUI subclasses to be an issue in 10.1.3. Not sure this has been resolved. Best suggestion is to file a service request with support and have them looking at a test case
Frank