Jpeg encoding in headless environment PLEASE HELP

Question

Hello, thank you so much for anyone that might be able to help me. If I am in the wrong forum, sorry.. please tell me where I need to go (I'm new here).
I am running a servlet (tomcat 4.01 - JRE 1.4.1) that uploads jpg images and creates thumbnails from them in a headless environment. The images are created without a problem for some amount of time and then all the images created are black (but they are the correct size). I haven't figured out what the trigger is yet. The memory seems to be ok (5 - 20MB left depending on how big the upload is). The only think I can do to make the process work correctly again is to restart the server. I have written out the image to a file before converting it and the image uploads fine... just the resized thumbnail is black. I have seen other issues like this which say to use a MediaTracker but I have 2 questions about that:
1) I don't have a component to use for the MediaTracker because I get a HeadlessException
2) I save the uploaded content into a byte array before converting so, I should have it already, right?
Below is the code I am using and any help would GREATLY appreciated. I thank anyone for taking the time to read this!
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
// this is the image resizine method snippet
public void resizeImage (int maxDim, byte[] imgContent, File outputFile) throws IOException {
     Image inImage = new ImageIcon(imgContent).getImage();
     int width = inImage.getWidth(null);
     int height = inImage.getHeight(null);
     double scale = maxDim / (double) height;
     if (width > height) scale = maxDim / (double) width;
     int scaledWidth = (int)(scale * width);
     int scaledHeight = (int)(scale * height);
     BufferedImage outImage = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
     AffineTransform tx = new AffineTransform();
     // If the image is smaller than
     //the desired image size,
     // don't bother scaling.
     if (scale < 1.0d) {
          tx.scale(scale, scale);
     // Paint image.
     Graphics2D g2d = outImage.createGraphics();
     g2d.drawImage(inImage, tx, null);
     g2d.dispose();
     // JPEG-encode the image
     //and write to file.
     FileOutputStream os = null;
     try {
          os = new FileOutputStream(outputFile);
          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
          encoder.encode(outImage);
     finally {
          os.close();
}

Answer 1

Hello, thank you so much for anyone that might be able to help me. If I am in the wrong forum, sorry.. please tell me where I need to go (I'm new here).
I am running a servlet (tomcat 4.01 - JRE 1.4.1) that uploads jpg images and creates thumbnails from them in a headless environment. The images are created without a problem for some amount of time and then all the images created are black (but they are the correct size). I haven't figured out what the trigger is yet. The memory seems to be ok (5 - 20MB left depending on how big the upload is). The only think I can do to make the process work correctly again is to restart the server. I have written out the image to a file before converting it and the image uploads fine... just the resized thumbnail is black. I have seen other issues like this which say to use a MediaTracker but I have 2 questions about that:
1) I don't have a component to use for the MediaTracker because I get a HeadlessException
2) I save the uploaded content into a byte array before converting so, I should have it already, right?
Below is the code I am using and any help would GREATLY appreciated. I thank anyone for taking the time to read this!
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
// this is the image resizine method snippet
public void resizeImage (int maxDim, byte[] imgContent, File outputFile) throws IOException {
     Image inImage = new ImageIcon(imgContent).getImage();
     int width = inImage.getWidth(null);
     int height = inImage.getHeight(null);
     double scale = maxDim / (double) height;
     if (width > height) scale = maxDim / (double) width;
     int scaledWidth = (int)(scale * width);
     int scaledHeight = (int)(scale * height);
     BufferedImage outImage = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
     AffineTransform tx = new AffineTransform();
     // If the image is smaller than
     //the desired image size,
     // don't bother scaling.
     if (scale < 1.0d) {
          tx.scale(scale, scale);
     // Paint image.
     Graphics2D g2d = outImage.createGraphics();
     g2d.drawImage(inImage, tx, null);
     g2d.dispose();
     // JPEG-encode the image
     //and write to file.
     FileOutputStream os = null;
     try {
          os = new FileOutputStream(outputFile);
          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
          encoder.encode(outImage);
     finally {
          os.close();
}