JSF 2.0 How a CAPTCHA works

Can sombody recommend me a good captcha tool for my JSF pages? Is there any captcha tool included in JEE6 or i have to add it to my project, like an external .jar? Also is there any brief tutorial on how to include it in my program? or Does Someone what would be the steps i should follow to do so?(I never used a captcha before).
There is no captcha tool included in Java EE 6.

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