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The reCAPTCHA Java Library provides a simple way to place a CAPTCHA on your Java-based website, helping you stop bots from abusing it. The library wraps the reCAPTCHA API . To use reCAPTCHA with Java/JSP, you can download the reCAPTCHA Java Library here (contributed by Soren) and unzip it. Typically the only thing you'll need is the jar file (recaptcha4j-X.X.X.jar), which you have to copy to a place where it can be loaded by your java application. For example, if you are using Tomcat to run JSP, you may put the jar file in a directory called .