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Java Authentication and Authorization Service (JAAS)

The Java Authentication and Authorization Service (JAAS) is a framework that supplements the Java 2 platform with user-based authentication and access control capabilities. It includes a Java implementation of the standard Pluggable Authentication Module (PAM) architecture, and provides support for user-based, group-based, or role-based access controls.
Links:
JAAS Tutorials
http://java.sun.com/j2se/1.4.2/docs/guide/security/jgss/tutorials/
ftp://ftp.oreilly.com/pub/conference/java2001/Rich_Jaas.pdf