Cameron,
Is X Windows running on your Linux box? If not, add:
-Djava.awt.headless=true
to the startup options of your web container.
Graham
> As part of my content management system, I need to be able to generate
> thumbnails from existing JPEG files located on the filesystem. A simple
> chunk of code I found uses the java.awt package to handle this nicely,
> but when I moved the compiled classes from my windowsXP testing machine
> to a linux server, it no longer worked. The code I have been using
> employs the (apparently) deprecated Toolkit class.
>
> I have seen that things like JAI and ImageMagick can accomplish this
> task, but it seems like overkill for something that is so simple, and
> should be available as part of the core Java distribution.
>
> Does anyone employ simple code that accomplishes the functionality
> implied by:
>
> generateThumbnail(String inFile, String outFile, String sizePercent)
>
> to create and save a jpeg to the filesystem at a different size?
>
>
>
> The code that I have been using is:
>
> makeThumbnail(String inFile, String thumbFile, String th, String
> inQuality) throws Exception {
>
> Image image = Toolkit.getDefaultToolkit().getImage(inFile);
> MediaTracker mediaTracker = new MediaTracker(new Container());
> mediaTracker.addImage(image, 0);
> mediaTracker.waitForID(0);
>
> int imageWidth = image.getWidth(null);
> int imageHeight = image.getHeight(null);
> double imageRatio = (double)imageWidth / (double)imageHeight;
>
> int thumbHeight = Integer.parseInt(th);
> int 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,RenderingHi
> nts.VALUE_INTERPOLATION_BILINEAR);
> graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
> // save thumbnail image to OUTFILE
> BufferedOutputStream out = new BufferedOutputStream(new
> FileOutputStream(thumbFile));
> JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
> JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
> int quality = Integer.parseInt(inQuality);
> quality = Math.max(0, Math.min(quality, 100));
> param.setQuality((float)quality / 100.0f, false);
> encoder.setJPEGEncodeParam(param);
> encoder.encode(thumbImage);
>
> }
>
>
>
> it throws the following exception (only when executed on a linux server)
> :
>
>
> java.lang.NoClassDefFoundError
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:141)
> at java.awt.Toolkit$2.run(Toolkit.java:748)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:739)
>
> Thanks for any advice...
>
> Cameron
>
>
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--
Graham Stark, Virtual Worlds
phone: (+044) 01908 618239 mobile: 07952 633185
Homepage http://www.virtual-worlds.biz
Virtual Learning Arcade http://www.bized.ac.uk/virtual/vla
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