15.9.3. Customizing the CAPTCHA algorithm

@Name("org.jboss.seam.captcha.captcha")
@Scope(SESSION)
public class HitchhikersCaptcha extends Captcha
{
  @Override @Create
  public void init() {
    setChallenge("What is the answer to life, the universe and everything?");
    setCorrectResponse("42");
  }

  @Override
  public BufferedImage renderChallenge() {
    BufferedImage img = super.renderChallenge();
    img.getGraphics().drawOval(5, 3, 60, 14); //add an obscuring decoration
    return img;
  }
}