Why JFrame is able to be displayed only in Eclipse?

Question

I have developed a Swing Java Application with only one JFrame with a JPanel inside it.

When I run that in Eclipse it is displaying correctly, but when I try to export as a Runnable Jar or Export to NetBeans it doesn't display the inner JPanel , just a empty JFrame .

Running in Eclipse

Running in JVM or NetBeans:

Code

public LoadJPanel(){
    Font_PalMap_rest = getCustomFont(ID_CODE_FONT_REST);
    Font_PalMap_title = getCustomFont(ID_CODE_FONT_TITLE);
    ImagePanel panel = new ImagePanel(new ImageIcon(Background_path).getImage());
    btnAddAndroid = getButtonConfig(ID_CODE_BUTTON_ADD_ANDROID_DEVICE);
    btnSendSMS = getButtonConfig(ID_CODE_BUTTON_SEND_SMS_AUTO);
    btnOpenFolder  = getButtonConfig(ID_CODE_BUTTON_OPEN_FOLDER);
    JLabel label_lembretePalmas = getLabelConfig(ID_CODE_LABEL_TITLE);
    JFrame frame = new JFrame("LembretePalmas");
    textArea = getTextAreaConfig(ID_CODE_DISPLAYING_PROCESS_AREA);
    scrollPane = getScrollPaneConfig(ID_CODE_DISPLAYING_PROCESS_AREA,textArea);
    panel.add(btnAddAndroid);
    panel.add(btnSendSMS);
    panel.add(label_lembretePalmas);
    panel.add(scrollPane);
    panel.add(btnOpenFolder);
    panel.setVisible(true);
    frame.getContentPane().setLayout(new FlowLayout());
    frame.getContentPane().add(panel, SwingConstants.CENTER);
    frame.setLocationRelativeTo(null);
    frame.setResizable(false);
    frame.setIconImage(new ImageIcon(Icon_path).getImage());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
    setServer();
}

Answer 1

I solved the problem.

It works when I copy the image's folder in the same path that the JAR is located.

I added System.getProperty("user.dir")); too at the beginning of the image's path.