JPanel with Image just doesn't want to show

Question

Hello,
i am trying to create a JPanel with a JLabel to which i assign an ImageIcon, but for some reason the JPanel seems not to appear in my JFrame.
Here's the code: private void jbInit() throws Exception
    NumberListener numListener = new NumberListener();
    frame = new JFrame();
    frame.setTitle("Error Manager");
    frame.setLayout(new GridBagLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridx = 0;
    gbc.gridy = 0;
    numberList = new JList(numbers);
    numberList.addListSelectionListener(numListener);
    numberList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane listScroller = new JScrollPane(numberList);
    listScroller.setPreferredSize(new Dimension(250, 80));
    frame.getContentPane().add(listScroller, gbc);
    imgPanel = new JPanel();
    imgPanel.setSize(300, 250);
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Image img = toolkit.createImage("Somepic.png");
    imgPanel.add(new JLabel(new ImageIcon(img)));
    gbc.gridx = 1;
    gbc.gridy = 0;
    frame.getContentPane().add(imgPanel, gbc);
    frame.pack();
    frame.setVisible(true);
  }

Answer 1

Sorry forgot to close the code tags...
private void jbInit() throws Exception
    NumberListener numListener = new NumberListener();
    frame = new JFrame();
    frame.setTitle("Error Manager");
    frame.setLayout(new GridBagLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridx = 0;
    gbc.gridy = 0;
    numberList = new JList(numbers);
    numberList.addListSelectionListener(numListener);
    numberList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane listScroller = new JScrollPane(numberList);
    listScroller.setPreferredSize(new Dimension(250, 80));
    frame.getContentPane().add(listScroller, gbc);
    imgPanel = new JPanel();
    imgPanel.setSize(300, 250);
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Image img = toolkit.createImage("1_Alpinweiss_III.png");
    imgPanel.add(new JLabel(new ImageIcon(img)));
    gbc.gridx = 1;
    gbc.gridy = 0;
    frame.getContentPane().add(imgPanel, gbc);
    frame.pack();
    frame.setVisible(true);
  }