JLabel cannot be set visible at runtime

Question

I am using a button to open a JFileChooser and when a user selects a txt file all the data are read from it and shown into a text area. When this process is happenning I want to show a gif image showing the progress.The image is set into a label. The label is just made visible true. But when I try to do that the label is not shown. The code is below:
function to open the JFileChooser
fPath = odb.OpenDialogBox("d");after selecting the file the following code is written
if (returnValue == JFileChooser.APPROVE_OPTION) {
File selectedFile = fileChooser.getSelectedFile();
parent.setLoadingVisible();parent is the object of the class from where OpenDialogBox function is called
code in setLoadingVisible() as follows
//ImageIcon icon = new ImageIcon(this.getClass().getResource("icon/loading.gif"));
        //jLabelImg.setIcon(icon);
        jLabelImg.setVisible(true);
        //jLabelImg.setVisible(true);
        //jLabelImg.updateUI();
        //SwingUtilities.updateComponentTreeUI(this);but it is not happening........................

Answer 1

isocdev_mb wrote:
And perhaps have a look at the demo app for [progress bars|http://java.sun.com/docs/books/tutorial/uiswing/components/progress.html].
++++
Yep