🚀 go-pugleaf

I have a simple little bean with two buttons on one side, and a label on
the other.  When I click on a button, the previous label is removed, and
another is added in its place.  The problem is that nothing changes when
I click the buttons unless I resize the frame.  And when I uncomment the
revalidate() lines, it works, but only for one or two clicks, then I get
the same behaviour where I need to resize the frame.  You'd think that
adding a component would be enough to cause it to draw itself, but it
doesn't seem like that's happening.

Am I missing something fundamental, here?

==========
import java.awt.*;
import com.sun.java.swing.*;
import java.awt.event.*;

public class NoRepaint extends JPanel {
    BorderLayout borderLayout1 = new BorderLayout();
    JPanel jPanel1 = new JPanel();
    JScrollPane jScrollPane1 = new JScrollPane();
    GridLayout gridLayout1 = new GridLayout();
    JButton jButton1 = new JButton();
    JButton jButton2 = new JButton();
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();

    public NoRepaint() {
        try  {
            jbInit();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        jPanel1.setLayout(gridLayout1);
        this.setLayout(borderLayout1);
        gridLayout1.setRows(2);
        gridLayout1.setColumns(1);
        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jButton1_actionPerformed(e);
            }
        });
        jButton2.setText("jButton2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jButton2_actionPerformed(e);
            }
        });
        jLabel1.setText("jLabel1");
        jLabel2.setText("jLabel2");
        this.add(jPanel1, BorderLayout.WEST);
        jPanel1.add(jButton1, null);
        jPanel1.add(jButton2, null);
        this.add(jScrollPane1, BorderLayout.CENTER);
    }

    void jButton1_actionPerformed(ActionEvent e) {
        jScrollPane1.getViewport().removeAll();
        jScrollPane1.getViewport().add(jLabel1, null);
//        jLabel1.revalidate();
    }

    void jButton2_actionPerformed(ActionEvent e) {
        jScrollPane1.getViewport().removeAll();
        jScrollPane1.getViewport().add(jLabel2, null);
//        jLabel2.revalidate();
    }

    public static void main(String[] args) {
        NoRepaint nr = new NoRepaint();
        JFrame frame = new JFrame("NoRepaint test");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        frame.getContentPane().add(nr, BorderLayout.CENTER);
        frame.setSize(200, 200);
        frame.setVisible(true);

        try {
            nr.wait();
        }
        catch(Exception e) {}
    }
}
==========

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