This project provides a java implementation of the Captcha project ( see http://www.captcha.net ). A CAPTCHA is a program that can generate and grade tests that: -Most humans can pass. -Current computer programs can't pass.
I downloaded the latest maven snapshot (r508, for 2.0-alpha-2) from https://sourceforge.net/p/jcaptcha/code/HEAD/tree/" and was able to build fine, however could not use it as-is because of it's runtime dependency on an older version of apache collections (commons-collections-3.2) whereas we are using commons-collections4-4.0. Because of the older collections it cannot find FastHashMap which is no longer included. Don't know where that class might be now (if it is available still, somewhere?) so to fix that dependency moved source for that class alone from the old collections into the jcaptcha module instead and updated that pom to use newer commons-collections4. Now works fine for us so seems like a fix you may want to consider implementing in your project as well.