Alguém ae que já usou jcaptcha sabe o que pode ser este erro:
java.lang.NoSuchMethodError: com.jhlabs.image.WaterFilter.setAmplitude(D)V
com.octo.captcha.engine.image.gimpy.DefaultGimpyEngine.buildInitialFactories(DefaultGimpyEngine.java:505)
com.octo.captcha.engine.image.ListImageCaptchaEngine.(ListImageCaptchaEngine.java:493)
com.octo.captcha.engine.image.gimpy.DefaultGimpyEngine.(DefaultGimpyEngine.java:494)
com.octo.captcha.service.image.DefaultManageableImageCaptchaService.(DefaultManageableImageCaptchaService.java:32)
br.org.cefsa.singasong.captcha.Captcha.(Captcha.java:46)
br.org.cefsa.singasong.captcha.Captcha.(Captcha.java:41)
br.org.cefsa.singasong.captcha.CaptchaServlet.doGet(CaptchaServlet.java:26)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
Está acontecendo isso quando instancio a classe DefaultManageableImageCaptchaService.