how to convert a java.awt.BufferedImage to Image

public static BufferedImage toBufferedImage(Image image) {
  if (image instanceof BufferedImage) {
    return (BufferedImage) image;
  }

  // This code ensures that all the pixels in the image are loaded
  image = new ImageIcon(image).getImage();

  // Determine if the image has transparent pixels
  boolean hasAlpha = hasAlpha(image);

  // Create a buffered image with a format that's compatible with the
  // screen
  BufferedImage bimage = null;
  GraphicsEnvironment ge = GraphicsEnvironment
  .getLocalGraphicsEnvironment();
  try {
      // Determine the type of transparency of the new buffered image
      int transparency = Transparency.OPAQUE;
      if (hasAlpha == true) {
        transparency = Transparency.BITMASK;
      }

      // Create the buffered image
      GraphicsDevice gs = ge.getDefaultScreenDevice();
      GraphicsConfiguration gc = gs.getDefaultConfiguration();
      bimage = gc.createCompatibleImage(image.getWidth(null), image
      .getHeight(null), transparency);
    } catch (HeadlessException e) {
  } // No screen

  if (bimage == null) {
    // Create a buffered image using the default color model
    int type = BufferedImage.TYPE_INT_RGB;
    if (hasAlpha == true) {
      type = BufferedImage.TYPE_INT_ARGB;
    }
    bimage = new BufferedImage(image.getWidth(null), image
    .getHeight(null), type);
  }

  // Copy image to buffered image
  Graphics g = bimage.createGraphics();

  // Paint the image onto the buffered image
  g.drawImage(image, 0, 0, null);
  g.dispose();

  return bimage;
}

public static boolean hasAlpha(Image image) {
  // If buffered image, the color model is readily available
  if (image instanceof BufferedImage) {
    return ((BufferedImage) image).getColorModel().hasAlpha();
  }

  // Use a pixel grabber to retrieve the image's color model;
  // grabbing a single pixel is usually sufficient
  PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
  try {
    pg.grabPixels();
  } catch (InterruptedException e) {
  }

  // Get the image's color model
  return pg.getColorModel().hasAlpha();
}

how to sign a jar file

build a keystore :

keytool -genkey -alias signFiles -keypass theKeyPass 

        -keystore theKeystore -storepass theStorePass

and sign your jar file using that keytool :

jarsigner -keystore mykey -signedjar sJarName.jar 

        JarName.jar signFiles 

you should run these commands, each on a single separate line