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Securing Your Java Applications - Acegi Security Style:
Matthew Porter wrote this good introductory article for Javalobby.
+ Acegi Security High-Level Overview Presentation:
+ Matt Raible has provided a nice PDF presentation comparing Acegi Security and J2EE CMA.
+
Container Managed Security: If your standard covers a lowest common denominator:
"For this reason I end up using something like Acegi Security", Dion Almaer comments after listing a series of missing hooks from the Servlet Spec security approach.