Because it is transient and after deserialization it will be null. On Thu, Jul 28, 2011 at 5:07 PM, armandoxxx <[email protected]> wrote: > Hi guys got a problem with NPE > > I'm having using Kaptcha for drawing captcha .. > > > > public class CaptchaImage extends NonCachingImage { > > private static final long serialVersionUID = 1667766853896645923L; > > private transient DefaultKaptcha captchaProducer = new > DefaultKaptcha(); > > // private DefaultKaptcha captchaProducer; > public CaptchaImage(String id) { > super(id); > > captchaProducer.setConfig(new Config(new Properties())); > > setImageResource(new DynamicImageResource() { > > private static final long serialVersionUID = > -3696927797622999885L; > > > public byte[] getImageData() { > ByteArrayOutputStream os = new > ByteArrayOutputStream(); > > // write the data out > ImageIO.setUseCache(false); > > try { > BufferedImage bi = > getImageCaptchaService(); > ImageIO.write(bi, "jpg", os); > return os.toByteArray(); > } catch (Exception e) { > throw new RuntimeException(e); > } > }; > > > private BufferedImage getImageCaptchaService() { > Request request = > RequestCycle.get().getRequest(); > HttpServletRequest httpRequest = ((WebRequest) > request).getHttpServletRequest(); > String capText = captchaProducer.createText(); > // store the text in the session > > httpRequest.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, > capText); > // create the image with the text > BufferedImage bi = > captchaProducer.createImage(capText); > return bi; > } > }); > } > } > > > > the problem is that I'm getting NPE on line: > > String capText = captchaProducer.createText(); > > > and I can't figure out why ... > > can anybody help please ? > > Regards > > Armando > > > -- > View this message in context: > http://apache-wicket.1842946.n4.nabble.com/NullPointerException-and-don-t-know-why-tp3701404p3701404.html > Sent from the Users forum mailing list archive at Nabble.com. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
-- Martin Grigorov jWeekend Training, Consulting, Development http://jWeekend.com
