FULL PRODUCT VERSION :
java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b104)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b104, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
SunOS rkh 5.10 Generic_118855-19 i86pc i386 i86pc


A DESCRIPTION OF THE PROBLEM :

Removing subcomponents from swing container (JPanel) doesn't remove them from screen.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run source code attached below. Try to click on the Add and Remove buttons. Try to change size of the application window with mouse after clicking on the Remove button.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -

Each time after after pushing Remove button (calling removeButtonActionPerformed method from example) one icon button disappears from the screen.

ACTUAL -

Nothing happens until changing application window size.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TestFrame extends JFrame
{
   private JPanel panel;

   private JButton addButton;
   private JButton removeButton;
   private JButton okButton;

   public TestFrame()
   {
      initComponents();
   }
   
   private void initComponents()
   {
      addButton = new JButton();
      removeButton = new JButton();
      okButton = new JButton();
      panel = new JPanel();

      setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      addButton.setText("Add");
      addButton.addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent evt)
         {
            addButtonActionPerformed(evt);
         }
      });

      removeButton.setText("Remove");
      removeButton.addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent evt)
         {
            removeButtonActionPerformed(evt);
         }
      });

      okButton.setText("Ok");
      okButton.addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent evt)
         {
            okButtonActionPerformed(evt);
         }
      });

      panel.setLayout(new FlowLayout(FlowLayout.LEFT));

      panel.setBorder(BorderFactory.createEtchedBorder());

      GroupLayout layout = new GroupLayout(getContentPane());
      getContentPane().setLayout(layout);
      layout.setHorizontalGroup(
         layout.createParallelGroup(GroupLayout.Alignment.LEADING)
         .addGroup(layout.createSequentialGroup()
            .addGap(22, 22, 22)
            .addComponent(addButton)
            .addGap(22, 22, 22)
            .addComponent(removeButton)
            .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 91, Short.MAX_VALUE)
            .addComponent(okButton)
            .addGap(25, 25, 25))
         .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(panel, GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
            .addContainerGap())
      );

      layout.linkSize(SwingConstants.HORIZONTAL, new Component[] {addButton, okButton, removeButton});

      layout.setVerticalGroup(
         layout.createParallelGroup(GroupLayout.Alignment.LEADING)
         .addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(panel, GroupLayout.PREFERRED_SIZE, 216, GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
               .addComponent(addButton)
               .addComponent(okButton)
               .addComponent(removeButton))
            .addContainerGap())
      );
      pack();
   }

   private int count=0;
   
   private void addButtonActionPerformed(ActionEvent evt)
   {
      JButton b=new JButton("Icon " + count++);
      panel.add(b);
      panel.validate();

   }
   
   private void removeButtonActionPerformed(ActionEvent evt)
   {
      int cnt=panel.getComponentCount();
      if(cnt!=0)
      {
         // It looks like this code doesn't work properly
         panel.remove(cnt-1);
         panel.validate();
      }

   }

   private void okButtonActionPerformed(ActionEvent evt)
   {
      System.exit(0);
   }

   public static void main (String args[])
   {
      EventQueue.invokeLater(new Runnable()
      {
         public void run()
         {
            new TestFrame().setVisible(true);
         }
      });
   }
}

---------- END SOURCE ----------