The purpose of the ESAPI is to provide a simple interface that provides all the security functions a developer is likely to need in a clear, consistent, and easy to use way. The ESAPI architecture is very simple, just a collection of classes that encapsulate the key security operations most applications need.

http://www.owasp.org/index.php/ESAPI

View the overview presentation:

http://owasp-esapi-java.googlecode.com/files/OWASP%20ESAPI.ppt

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