Problem: ImageIcon and JPanel

Hi,

I'll try to explain what I want. I have a JDialog with a JList, a JPanel to show an imageicon and another JPanel with buttons. The list is filled with strings and each string has its own image to display on the JPanel. But when I tried to create the JDialog(in execution time), it fails because the imageicon is null. If I debug the app, I can see that the imageicon has the right height, width and the location. Can somebody explain me why?

Here it's the code:

publicclass CambioCampoextends JDialogimplements ActionListener, ListSelectionListener{

private JScrollPane list;

private JPanel buttons, previs;

private JList list_fields;

private ArrayList<String> name_fields =new ArrayList<String>();

private ArrayList<String> path_fields =new ArrayList<String>();

private JButton add accept, cancel;

private ImageIcon thumb;

public CambioCampo(JFrame dad, String title,boolean modal)

{

super(dad, title, modal);

this.setSize(400,300);

setResizable(false);

this.setLocationRelativeTo(dad);

crearCambioCampo();

}

privatevoid crearCambioCampo(){

Container cambiocampo = this.getContentPane();

cambiocampo.setLayout(new BorderLayout());

previs =new JPanel();

previs.setSize(270, 150);

String fields = getFile("images/campos.txt");

String delim ="_";

StringTokenizer separador =new StringTokenizer(fields,delim);

construyeArrayList(separador);

list_fields =new JList(name_fields.toArray());

list_fields.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

list_fields.setSelectedIndex(0);

list_fields.addListSelectionListener(this);

list =new JScrollPane(list_fields);

list.setSize(100, 150);

cambiocampo.add("West", list);

thumb =new ImageIcon("images/mes/classict.gif");

//when the next line is executed, it is printed the right width and height of the imageicon

System.out.println("Width: "+thumb.getIconWidth()+" Height: "+thumb.getIconHeight());

//the next line is where the nullpointerexception is throwed. It says thumb is null and can't paint it

thumb.paintIcon(previs,previs.getGraphics(), 0, 0);

cambiocampo.add("East", previs);

And here i have code that works and is not related with the thumb

By the way, the path is correct, the gif image is in its right place and I work with eclipse ide.

Thanks in advance,

Carlos

[3739 byte] By [paxtora] at [2007-11-26 14:58:41]