| Interface | Description | 
|---|---|
| AccessLog | |
| 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. | 
| 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. | 
| 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 | |
| Group | Abstract representation of a group of  Users in aUserDatabase. | 
| 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  Serverelement 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
 HttpSessionthat is used to maintain state information
between requests for a particular user of a web application. | 
| 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. | 
| User | Abstract representation of a user in a  UserDatabase. | 
| UserDatabase | |
| 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 | Description | 
|---|---|
| CatalinaFactory | Deprecated There was no demand for this capability and it will be removed in
Tomcat 8.0.x | 
| 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. | 
| SessionEvent | General event for notifying listeners of significant changes on a Session. | 
| Enum | Description | 
|---|---|
| LifecycleState | The list of valid states for components that implement  Lifecycle. | 
| Exception | Description | 
|---|---|
| LifecycleException | General purpose exception that is thrown to indicate a lifecycle related
problem. | 
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