Help with java.awt.Headless

Question

I added the following line to the catalina.sh file:
JAVA_OPTS=-Djava.awt.headless=true
My image was rendered the first time round but when I hit refresh it goes away and is replaced by just a black background. I have been working on this issue of rendering/resizing an image for months and I am just getting frustrated that I can 't seem to find out the problem.
Here is my code:
public static byte[] getResizedImage(byte[] imageData, int thumbWidth, int thumbHeight, int quality) throws IOException{
//create instance of Image from byte array
Image image = Toolkit.getDefaultToolkit().createImage(imageData);
// determine thumbnail size from WIDTH and HEIGHT
double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
thumbHeight = (int)(thumbWidth / imageRatio);
} else {
thumbWidth = (int)(thumbHeight * imageRatio);
// draw original image to thumbnail image object and
// scale it to the new size on-the-fly
BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
// set quality of thumbnail and doing resizing
ByteArrayOutputStream os = new ByteArrayOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
quality = Math.max(0, Math.min(quality, 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
//return byte array
return os.toByteArray();
}

Answer 1

MediaTracker mt = new MediaTracker(new Label());You say this is a servlet; this code is running within a J2EE app server, not where a user can see any GUI components. So the question in the first place is, why are you creating a Label GUI object in this code?
Don't do that.