Java SE (Java Platform, Standard Edition)

Hello,
I am currently in the process of migrating my application (IMS.Server) from windows
to Linux. One of the last problems I face is a piece of code, which works on windows,
but fails on Linux. I tried a couple of days, and googled, but so far with no success.
The piece of code which fails prints a text onto a buffered imaged. I made an excerpt
of the code, put that into one class. It runs on Windows, fails on Linux (Fedora Core 2).
Here is the code:

/*
 * Created on Oct 27, 2004
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

import java.awt.image.BufferedImage;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;

/**
 * @author rm11-rolf
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class ThumbnailGenerationTestX {

  public static void main(String[] args) {
    doThumbnailGenerationTest();
  }
  
  public static void doThumbnailGenerationTest() {
    
    int sizeW = 1024;
    int sizeH = 768;
    System.out.println("sizeW  = " + sizeW);
    System.out.println("sizeH  = " + sizeH);
    System.out.println();
    
    String myText = "(c) by Rolf Mueller";
    String fontName = "serif";
    int fontSize = 32;
    int fontAtt = Font.BOLD;
    Font font = new Font(fontName, fontAtt, fontSize);
    AttributedString as = new AttributedString(myText);
    as.addAttribute(TextAttribute.FONT,font,0,myText.length());
    Color blackColor = new Color(255,255,255);
    as.addAttribute(TextAttribute.FOREGROUND,blackColor,0,myText.length());
    System.out.println("myText    = " + myText);
    System.out.println("fontName  = " + fontName);
    System.out.println("fontSize  = " + fontSize);
    System.out.println();

    // Create empty Image...
    BufferedImage bgImage = new BufferedImage(sizeW,sizeH,BufferedImage.TYPE_INT_RGB);
    Graphics2D bgG2d = bgImage.createGraphics();
    // calculate the width of the text
    TextLayout tl2d = getBoundsFromString(as,bgG2d);
    Rectangle2D ra2d = tl2d.getBounds();
    int textWidth = (int)ra2d.getWidth();
    int textHeight = (int)ra2d.getHeight();
    int textAscent = (int)tl2d.getAscent();
    int textDescent = (int)tl2d.getDescent();
    System.out.println("textWidth   = " + textWidth);
    System.out.println("textHeight  = " + textHeight);
    System.out.println("textAscent  = " + textAscent);
    System.out.println("textDescent = " + textDescent);
    System.out.println();
    
    // Create an image buffer for the forground with the text
    BufferedImage fgImage = new BufferedImage(textWidth, textAscent, BufferedImage.TYPE_INT_RGB);
    Graphics2D fgG2d = fgImage.createGraphics();
    AffineTransform fontAT = new AffineTransform();
    AttributedCharacterIterator aci = as.getIterator();
    fgG2d.drawString(aci,0,textHeight-textDescent);
    fgG2d.dispose();

    // calculate the position (which is lower right)
    int offset = sizeH / 100;
    int textXPos = sizeW - textWidth - offset;
    int textYPos = sizeH - offset - textHeight;
    System.out.println("offset    = " + offset);
    System.out.println("textXPos  = " + textXPos);
    System.out.println("textYPos  = " + textYPos);
    System.out.println();

    // get the background image pixels
    int[] bgPixels = new int[ textWidth * textHeight ];
    bgPixels = bgImage.getRGB( textXPos, textYPos, textWidth, textHeight, bgPixels, 0, textWidth );

    // get the forground image pixels
    int[] fgPixels = new int[ textWidth * textHeight * 10 ];
    try {
      fgPixels = fgImage.getRGB( 0, 0, textWidth, textHeight, fgPixels, 0, textWidth );
    } catch (Exception ex) {
      ex.printStackTrace();
    }
    System.out.println("Finished successfully!");
    
  }

  /**
   * getBoundsFromString()
   * retrieves the boundaries of a String
   * @param as
   * @param g2d
   * @return TextLayout
   */
  private static TextLayout getBoundsFromString(AttributedString as, Graphics2D g2d) {
    AttributedCharacterIterator attribCharIterator = as.getIterator();
    FontRenderContext frc = g2d.getFontRenderContext();
    TextLayout tl = new TextLayout(attribCharIterator,frc);    
    return tl;
  }

}

Ok, here is the result, when I run it on a Linux Box:

sizeW  = 1024
sizeH  = 768

myText    = (c) by Rolf Mueller
fontName  = serif
fontSize  = 32

textWidth   = 293
textHeight  = 31
textAscent  = 30
textDescent = 6

offset    = 7
textXPos  = 724
textYPos  = 730

java.lang.ArrayIndexOutOfBoundsException: Coordinate out of bounds!
        at sun.awt.image.IntegerInterleavedRaster.getDataElements(IntegerInterleavedRaster.java:202)
        at java.awt.image.BufferedImage.getRGB(BufferedImage.java:862)
        at ThumbnailGenerationTestX.doThumbnailGenerationTest(ThumbnailGenerationTestX.java:94)
        at ThumbnailGenerationTestX.main(ThumbnailGenerationTestX.java:29)

The same piece of code running on Windows (win2k) gives me the following result:

sizeW  = 1024
sizeH  = 768

myText    = (c) by Rolf Mueller
fontName  = serif
fontSize  = 32

textWidth   = 260
textHeight  = 28
textAscent  = 32
textDescent = 7

offset    = 7
textXPos  = 757
textYPos  = 733

Finished successfully!

I know, the environment on a Linux system is different, and I played around with
the fontsize a bit.

Is this a java/awt bug?
Or even a java/awt implementation bug on Fedora Core 2?
Or am I doing something wrong here?

Thanks for your help.
Any feedback appreciated.

Rolf