Blank Frame After Switching to Java 6

Question

I've been behind the times for quite a while, and I only just today switched from Java 5 to Java 6 (the latest revision). I have a couple little GUI programs I use occasionally for things. Nothing fancy. They just stick some text fields and buttons on the screen and spit out results into another text field. I haven't had any problems with them in the past.
Now that I install Java 6, though, when the JFrame pops up, all I see is a big gray area on it. All the components are located directly on the JFrame's content pane, and they're layed out using SpringLayout. I've printed out the some sizes and locations, and they're all what they're supposed to be. The components are indeed visible. The JFrame is the right size (as opposed to a tiny title bar with nothing underneath when you forget to set the layout or something). The content pane's layout is the SpringLayout it's supposed to be. Any ideas on what's causing this or how to fix it?

Answer 1

Sorry for the double post, but I don't see an edit field up on the first post.
I should clarify. I actually have a few JPanels on the content pane, and the JPanels do have some components on them. Every single component has a non-zero size and is set to visible. Furthermore, everything is a lightweight component. Does anyone know what issues might be causing this?
EDIT_:
I have come up with a sample that reproduces my bug. (Yeesh. That was a pain.)
import javax.swing.*;
import java.awt.*;
public class FrameTesting
     public static void main(String[] args)
          JFrame frame = new JFrame("Testing for blank");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          Container cp = frame.getContentPane();
          JPanel row1 = buildRow(new JLabel("Test Label:"), new JTextField(8), new JButton("Test Button"));
          cp.add(row);
          frame.pack();
          frame.setVisible(true);
     private static Spring ZERO = Spring.constant(0);
     private static Spring FIVE = Spring.constant(5);
     private static JPanel buildRow(Component... components)
          JPanel row = new JPanel();
          SpringLayout layout = new SpringLayout();
          row.setLayout(layout);
          SpringLayout.Constraints cons;
          Spring nextX = ZERO;
          Spring east = ZERO; //Initialize so correct if components.length == 0
          Spring rowHeight = ZERO;
          for (Component c: components)
               row.add(c);
               cons = layout.getConstraints(c);
               cons.setX(nextX);
               cons.setY(ZERO);
               east = Spring.sum(cons.getX(), cons.getWidth());
               nextX = Spring.sum(east, FIVE); // The FIVE acts as a spacer.
               rowHeight = Spring.max(rowHeight, cons.getHeight());
          cons = layout.getConstraints(row);
          cons.setWidth(east); //east is the east of the last Component
          cons.setHeight(rowHeight);
          return row;
}If you'd like to convince yourself that the components actually have the correct sizes and positions, insert these two methods (and see below them)
     private static void printVisibility(Component c)
          printVisibility(c, "");
     private static void printVisibility(Component c, String indent)
          System.out.println(indent + c.getBounds() + " Visible: " + c.isVisible());
          if (c instanceof Container && ((Container)c).getComponentCount() > 0)
               String nextIndent = indent + "   ";
               for (Component c1: ((Container)c).getComponents())
                    printVisibility(c1, nextIndent);
     }...and insert this call at the end_ of the main method (after the pack()).
printVisibility(cp);Based on what I've been doing trying to track down the bug, it looks like it's in the buildRow(Component...) method. Perhaps something has changed with SpringLayout?
Edited by: Legend_Keeper on Oct 7, 2008 11:56 PM
Fixed a stupid typo in the code, but it didn't fix the problem at hand.
Edited by: Legend_Keeper on Oct 8, 2008 3:19 AM
Okay, so now it looks like it might be a problem where the children are off of the JPanel's drawing area (in other words, outside its bounding box) This is the output from printVisibility:
java.awt.Rectangle[x=0,y=0,width=263,height=26] Visible: true
   java.awt.Rectangle[x=0,y=0,width=263,height=26] Visible: true
      java.awt.Rectangle[x=26,y=26,width=62,height=26] Visible: true
      java.awt.Rectangle[x=67,y=26,width=92,height=26] Visible: true
      java.awt.Rectangle[x=164,y=26,width=99,height=26] Visible: trueAs you can see, the height of the panel (first indentation) is only 26, but for some reason the y positions of its children are 26. This is particularly strange since you can see I explicitly set the y Spring in the Constraints object to be 0. o_O Any help would be appreciated.
Edited by: Legend_Keeper on Oct 8, 2008 6:07 AM