org.apache.catalina (Tomcat API Documentation)
Keywords: org.apache.catalina package

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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.
CometEvent | The CometEvent interface.
CometFilter | A Comet filter, similar to regular filters, performs filtering tasks on either the request to a resource (a Comet servlet), or on the response from a resource, or both.
CometFilterChain | A CometFilterChain is an object provided by the servlet container to the developer giving a view into the invocation chain of a filtered event for a resource.
CometProcessor | This interface should be implemented by servlets which would like to handle asynchronous IO, recieving events when data is available for reading, and being able to output data without the need for being invoked by the container.
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.
Engine | An Engine is a Container that represents the entire Catalina servlet engine.
Executor |
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.
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.
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.
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.
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.

Enum Summary
CometEvent.EventSubType | Event details TIMEOUT - the connection timed out (sub type of ERROR); note that this ERROR type is not fatal, and the connection will not be closed unless the servlet uses the close method of the event CLIENT_DISCONNECT - the client connection was closed (sub type of ERROR) IOEXCEPTION - an IO exception occurred, such as invalid content, for example, an invalid chunk block (sub type of ERROR) WEBAPP_RELOAD - the webapplication is being reloaded (sub type of END) SERVER_SHUTDOWN - the server is shutting down (sub type of END) SESSION_END - the servlet ended the session (sub type of END)
CometEvent.EventType | Enumeration describing the major events that the container can invoke the CometProcessors event() method with BEGIN - will be called at the beginning of the processing of the connection.

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

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