Our application Zapdata.com has used Jcaptcha version 1.0_RC6..We are getting com.octo.captcha.service.CaptchaServiceException quite frequently and on an average we get 20%-30% unsuccessful logins.What could be the possible reasons for it or it is a BUG?
Possible reasons are :
the user try to validate an old captcha (timeout occured, the captcha is cleared from the store)
the user try to validate an already validated captcha
injection of an unknown captcha id