import javax.media.opengl.*;
import java.awt.*;
import javax.swing.*;
 
public class ResizeIssue {

   public static void main(String[] args) {
      JFrame frame = new JFrame("Resize Issue");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
      JPanel panel = new JPanel();
      panel.setPreferredSize(new Dimension(400,400));
      frame.getContentPane().add(panel);
      panel.setLayout(new GridBagLayout());
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridwidth = GridBagConstraints.REMAINDER;
      gbc.gridheight = 1;
      gbc.weightx = gbc.weighty = 1;
      gbc.fill = GridBagConstraints.BOTH;
    
      JPanel redPanel = new JPanel();
      redPanel.setBackground(Color.RED);
      redPanel.add(new JLabel("don't squeeze me!"));
      panel.add(redPanel,gbc);
      
      final GLCanvas canvas = new GLCanvas();
      // Make the canvas clear itself when drawn
      canvas.addGLEventListener(new GLEventListener() {
         public void init(GLAutoDrawable drawable) {
            drawable.getGL().glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
         }
         public void display(GLAutoDrawable drawable) {
            drawable.getGL().glClear(GL.GL_COLOR_BUFFER_BIT |
                                     GL.GL_DEPTH_BUFFER_BIT);
         }
         public void reshape(GLAutoDrawable drawable,
                             int x, int y, int width, int height) {}
         public void displayChanged(GLAutoDrawable drawable,
                             boolean modeChanged, boolean deviceChanged) {}
      });

      panel.add(canvas,gbc);

      // NOTE: the code below solves the problem for Java >= 1.5
      // canvas.setPreferredSize(new Dimension(0,0));

      // NOTE: the code below solves the problem for Java < 1.5
      // JPanel cont = new JPanel();
      // cont.setLayout(new BorderLayout());
      // cont.add(canvas, BorderLayout.CENTER);
      // cont.setPreferredSize(new Dimension(0, 0));
      // c.add(cont, gbc);
 
      frame.pack();
      frame.setVisible(true);
   }
}