Try this:
Image buffer = Image.createImage(width, height);
Graphics g = buffer.getGraphics();
g.translate(-cmp.getAbsoluteX(), -cmp.getAbsoluteY());
cmp.paintComponent(g);
g.translate(cmp.getAbsoluteX(), cmp.getAbsoluteY());
ByteArrayOutputStream stream = new ByteArrayOutputStream();
ImageIO.getImageIO().save(buffer, stream,
ImageIO.FORMAT_PNG, 1);
byte[] byteArray = stream.toByteArray();
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