looking for an opensoure authenciation releated project to learn [closed]

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I have three years's expeirence of java develping.

Now I am working with an system which is related to the ahthenciation. I am not good at this.

So I wonder i开发者_如何学JAVAf there is any opensoure project I can read and learn someting from which?

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Spring Security is a good place to start.

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I would recommend Apache Shiro

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Check out Fortress, it is released under BSD open source license: http://iamfortress.org/