java security classloader

I am implementing a service which uses a URLClassloader to load classes dynamically.

In the interest of security I would like t开发者_StackOverflow中文版o restrict the access of loaded classes. eg no network, file or db access etc.

Anybody got any good resources or tutorials on the web for this kind of thing?

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Google for "JavaSeal". But they didn't publish the code though.

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http://java.sun.com/developer/technicalArticles/Networking/classloaders/ might be useful