This package contains `Realm` implementations for the various supported realm technologies for authenticating users and identifying their associated roles. The `Realm` that is associated with a web application's `Context` (or a hierarchically superior Container) is used to resolve authentication and role presence questions when a web application uses container managed security as described in the Servlet API Specification, version 2.2.

The implementations share a common base class that supports basic functionality for all of the standard `Realm` implementations.