Hi,

why JScrollPane is not repainting like other components (like JButton)?

repaint()on main frame doesn't work on JScrollPane, only
setVisible(true) on main frame works well

could anyone help? (there is a quick, working code example below)

thanks very much in advance for your help!

CODE SAMPLE:
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;

public class ScrollPaneTest extends JFrame{
   
    public ScrollPaneTest() {
       
        this.setLayout(null);
       
        this.setBounds(100,100,300,300);
        this.setVisible(true);
       
        //JScrollPane begin
        JScrollPane scrollPane = new JScrollPane();
       
        JLabel label = new JLabel("This is JLabel!");
        scrollPane.setViewportView(label);
       
        scrollPane.setBounds(50,50,80,80);
        scrollPane.setVerticalScrollBarPolicy(
            ScrollPaneConstants.
            VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setHorizontalScrollBarPolicy(
            ScrollPaneConstants.
            HORIZONTAL_SCROLLBAR_ALWAYS);
       
        this.getContentPane().add(scrollPane);
        //JScrollPane end
       
       
        //JButton begin
        JButton button = new JButton();
       
        button.setBounds(50,200,50,50);
       
        this.getContentPane().add(button);
        //JButton end
       
        this.repaint(); //JScrollPane content is blank!
       
        //But setVisible(true) makes everything ok.
    }

    public static void main(String[] args) {
       
        new ScrollPaneTest();
    }
   
}

regards,
lmierzej