ImageIO write load issue

    BufferedImage image = generateCaptchaImage(engine, cycle, output, height, width, fontSize, noOfBoxesToBeDrawn,            noOfLinesToBeDrawn, alphabetCount, letterWidth, background, text);    HttpServletResponse response = cycle.getRequestContext().getResponse();    response.setContentType("image/jpeg");    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(response.getOutputStream());    encoder.encode(image);

replaced above code with below, but my image is not getring rendered on htmp page

    BufferedImage image = generateCaptchaImage(engine, cycle, output, height, width, fontSize, noOfBoxesToBeDrawn,            noOfLinesToBeDrawn, alphabetCount, letterWidth, background, text);    HttpServletResponse response = cycle.getRequestContext().getResponse();    response.setContentType("image/jpeg");    ImageIO.write(image,"jpg",response.getOutputStream());

upgraded jdk from 1.6 to 1.8 and and changed some existing java code with ImageIO codeafter that captcha image is not getting shown.