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## Package org.apache.catalina

Interface Summary
Authenticator | An Authenticator is a component (usually a Valve or Container) that provides some sort of authentication service.
Cluster | A Cluster works as a Cluster client/server for the local host Different Cluster implementations can be used to support different ways to communicate within the Cluster.
Connector | A Connector is a component responsible receiving requests from, and returning responses to, a client application.
Contained | Decoupling interface which specifies that an implementing class is associated with at most one Container instance.
Container | A Container is an object that can execute requests received from a client, and return responses based on those requests.
ContainerListener | Interface defining a listener for significant Container generated events.
ContainerServlet | A ContainerServlet is a servlet that has access to Catalina internal functionality, and is loaded from the Catalina class loader instead of the web application class loader.
Context | A Context is a Container that represents a servlet context, and therefore an individual web application, in the Catalina servlet engine.
DefaultContext | Used to store the default configuration a Host will use when creating a Context.
Deployer | A Deployer is a specialized Container into which web applications can be deployed and undeployed.
Engine | An Engine is a Container that represents the entire Catalina servlet engine.
Group | Abstract representation of a group of `User`s in a `UserDatabase`.
Host | A Host is a Container that represents a virtual host in the Catalina servlet engine.
HttpRequest | An HttpRequest is the Catalina internal facade for an `HttpServletRequest` that is to be processed, in order to produce the corresponding `HttpResponse`.
HttpResponse | An HttpResponse is the Catalina-internal facade for an `HttpServletResponse` that is to be produced, based on the processing of a corresponding `HttpRequest`.
InstanceListener | Interface defining a listener for significant events related to a specific servlet instance, rather than to the Wrapper component that is managing that instance.
Lifecycle | Common interface for component life cycle methods.
LifecycleListener | Interface defining a listener for significant events (including "component start" and "component stop" generated by a component that implements the Lifecycle interface.
Loader | A Loader represents a Java ClassLoader implementation that can be used by a Container to load class files (within a repository associated with the Loader) that are designed to be reloaded upon request, as well as a mechanism to detect whether changes have occurred in the underlying repository.
Logger | A Logger is a generic interface for the message and exception logging methods of the ServletContext interface.
Manager | A Manager manages the pool of Sessions that are associated with a particular Container.
Pipeline | Interface describing a collection of Valves that should be executed in sequence when the `invoke()` method is invoked.
Realm | A Realm is a read-only facade for an underlying security realm used to authenticate individual users, and identify the security roles associated with those users.
Request | A Request is the Catalina-internal facade for a `ServletRequest` that is to be processed, in order to produce the corresponding `Response`.
Response | A Response is the Catalina-internal facade for a `ServletResponse` that is to be produced, based on the processing of a corresponding `Request`.
Role | Abstract representation of a security role, suitable for use in environments like JAAS that want to deal with `Principals`.
Server | A `Server` element represents the entire Catalina servlet container.
Service | A Service is a group of one or more Connectors that share a single Container to process their incoming requests.
Session | A Session is the Catalina-internal facade for an `HttpSession` that is used to maintain state information between requests for a particular user of a web application.
SessionListener | Interface defining a listener for significant Session generated events.
Store | A Store is the abstraction of a Catalina component that provides persistent storage and loading of Sessions and their associated user data.
User | Abstract representation of a user in a `UserDatabase`.
UserDatabase | Abstract representation of a database of `User`s and `Group`s that can be maintained by an application, along with definitions of corresponding `Role`s, and referenced by a `Realm` for authentication and access control.
Valve | A Valve is a request processing component associated with a particular Container.
ValveContext | A ValveContext is the mechanism by which a Valve can trigger the execution of the next Valve in a Pipeline, without having to know anything about the internal implementation mechanisms.
Wrapper | A Wrapper is a Container that represents an individual servlet definition from the deployment descriptor of the web application.

Class Summary
ContainerEvent | General event for notifying listeners of significant changes on a Container.
Globals | Global constants that are applicable to multiple packages within Catalina.
InstanceEvent | General event for notifying listeners of significant events related to a specific instance of a Servlet, or a specific instance of a Filter, as opposed to the Wrapper component that manages it.
LifecycleEvent | General event for notifying listeners of significant changes on a component that implements the Lifecycle interface.
ServerFactory | ServerFactory allows the registration of the (singleton) `Server` instance for this JVM, so that it can be accessed independently of any existing reference to the component hierarchy.
SessionEvent | General event for notifying listeners of significant changes on a Session.

Exception Summary
LifecycleException | General purpose exception that is thrown to indicate a lifecycle related problem.

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