I'm noticing in the 5 minute integration tutorial that it's necessary to create a CaptchaServiceSingleton class.
Seems like it would be helpful to have a reference to this singleton on the the ImageCaptchaService interface. Could be implemented like this:
public ImageCaptchaService ICS_INSTANCE =
This way any class that wants the service just has to implement ImageCaptchaService and use the implementation singleton per the ICS_INSTANCE reference.
Thanks for JCAPTCHA. It's a brilliant project!