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Managing memory usage when getting many screenshots in Java
public BufferedImage getScreenShot() {

    BufferedImage screenImage = null;
    try {

        GraphicsEnvironment ge= GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice[] screens=ge.getScreenDevices();
        Rectangle allScreenBounds=new Rectangle();
        for(GraphicsDevice screen: screens)
        {
            Rectangle screenbounds = screen.getDefaultConfiguration().getBounds();
            allScreenBounds.width+=screenbounds.width;
            allScreenBounds.height=Math.max(allScreenBounds.height, screenbounds.height);
        }


        Robot robot = new Robot();
        screenImage = robot.createScreenCapture(allScreenBounds);
    } catch (Exception ex) {
        Logger.getLogger(Screen.class.getName()).log(Level.SEVERE, null, ex);
    }
    return screenImage;
}

while(true){
  FileImageOutputStream out = new FileImageOutputStream(f);
  writer.setOutput(out);
  IIOImage image = new IIOImage(ImageUtils.resize(getScreenShot(), width, height),null, null);
  writer.write(null, image, iwp);
  writer.dispose();
}

writer.write(null, image, iwp);

image=null;