Headless Exception in Linux

[Luke Shannon]

Hi;

I am resizing an image using some classes from the AWT. On this line:

GraphicsDevice gs = ge.getDefaultScreenDevice();

I get a HeadlessException in Linux, works fine in Windows.

How can I work around this?

Below is the entire code:

 
if ((imageThumb.getHeight() >= 76) || (imageThumb.getWidth() >= 76)) {
myLogger.debug(ImageUploader.class.getName()
+ "Need to scale for thumb");
if (imageThumb.getHeight() > imageThumb.getWidth())
resizeWidth = false;
Image scaledImage = null;
if (resizeWidth) {
scaledImage = imageThumb.getScaledInstance(100, -1,
Image.SCALE_SMOOTH);
}
else {
scaledImage = imageThumb.getScaledInstance(-1, 100,
Image.SCALE_SMOOTH);
}
myLogger.debug(ImageUploader.class.getName()
+ "Had to scale the width: " + resizeWidth);
BufferedImage scaledImg = null;
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
myLogger.debug(ImageUploader.class.getName()
+ " LocalGraphicsEnvironment created.");
GraphicsDevice gs = ge.getDefaultScreenDevice();
myLogger.debug(ImageUploader.class.getName()
+ " Graphic Device created.");
GraphicsConfiguration gc = gs.getDefaultConfiguration();
myLogger.debug(ImageUploader.class.getName()
+ " Graphic Configuration created.");
scaledImg = gc.createCompatibleImage(scaledImage.getWidth(null), scaledImage.getHeight(null),
BufferedImage.TYPE_INT_RGB);
myLogger.debug(ImageUploader.class.getName()
+ " Compatible image placed in the imageBuffer.");
Graphics g = scaledImg.createGraphics();
myLogger.debug(ImageUploader.class.getName()
+ " Graphics created from the imageBuffer.");
g.drawImage(imageThumb, 0, 0, scaledImage.getWidth(null), scaledImage.getHeight(null), null);
myLogger.debug(ImageUploader.class.getName()
+ " Graphics redrawn on to the imageBuffer.");
g.dispose();
myLogger.debug(ImageUploader.class.getName()
+ " Graphics disposed.");
ImageIO.write(imageThumb, "jpeg", thumb);
myLogger.debug(ImageUploader.class.getName()
+ " Image written to file.");
} 

Thanks,

Luke

[Geoffrey Falk]

Take a look at PJA Toolkit. This allows you to use AWT classes in headless mode.

We use it for font metric calculations in a server-side application.

Geoffrey

[Luke Shannon]

Thank you!