# Package org.apache.catalina

package org.apache.catalina

Class
Description
AccessLog
Intended for use by a `Valve` to indicate that the `Valve` provides access logging.
AsyncDispatcher
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.
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.
ContainerEvent
General event for notifying listeners of significant changes on a Container.
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.
CredentialHandler
This interface is used by the `Realm` to compare the user provided credentials with the credentials stored in the `Realm` for that user.
DistributedManager
Interface implemented by session managers that do not keep a complete copy of all sessions in memory but do know where every session is.
Engine
An Engine is a Container that represents the entire Catalina servlet engine.
Executor
Globals
Global constants that are applicable to multiple packages within Catalina.
Group
Abstract representation of a group of `User`s in a `UserDatabase`.
GSSRealm
Deprecated.
This will be removed in Tomcat 9 and integrated into `Realm`.
Host
A Host is a Container that represents a virtual host in the Catalina servlet engine.
JmxEnabled
This interface is implemented by components that will be registered with an MBean server when they are created and unregistered when they are destroyed.
Lifecycle
Common interface for component life cycle methods.
Lifecycle.SingleUse
Marker interface used to indicate that the instance should only be used once.
LifecycleEvent
General event for notifying listeners of significant changes on a component that implements the Lifecycle interface.
LifecycleException
General purpose exception that is thrown to indicate a lifecycle related problem.
LifecycleListener
Interface defining a listener for significant events (including "component start" and "component stop" generated by a component that implements the Lifecycle interface.
LifecycleState
The list of valid states for components that implement `Lifecycle`.
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 Context.
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.
SessionEvent
General event for notifying listeners of significant changes on a Session.
SessionIdGenerator
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.
StoreManager
PersistentManager would have been a better name but that would have clashed with the implementation name.
ThreadBindingListener
Callback for establishing naming association when entering the application scope.
TomcatPrincipal
Defines additional methods implemented by `Principal`s created by Tomcat's standard `Realm` implementations.
TrackedWebResource
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.
WebResource
Represents a file or directory within a web application.
WebResourceRoot
Represents the complete set of resources for a web application.
WebResourceRoot.ResourceSetType
WebResourceSet
Represents a set of resources that are part of a web application.
Wrapper
A Wrapper is a Container that represents an individual servlet definition from the deployment descriptor of the web application.