| JNDI Overview

## Event Package

> The `javax.naming.event` package contains classes and interfaces for supporting event notification in naming and directory services. Event notification is described in detail in the Beyond the Basics trail.

> #### Events

> A `NamingEvent` represents an event that is generated by a naming/directory service. The event contains a type that identifies the type of event. For example, event types are categorized into those that affect the namespace, such as "object added," and those that do not, such as "object changed." A `NamingEvent` also contains other information about the change, such as information about the object before and after the change.

> #### Listeners

> A `NamingListener` is an object that listens for `NamingEvent`s. Each category of event type has a corresponding type of `NamingListener`. For example, a `NamespaceChangeListener` represents a listener interested in namespace change events and an `ObjectChangeListener` represents a listener interested in object change events.

> To receive event notifications, a listener must be registered with either an `EventContext` or an `EventDirContext`. Once registered, the listener will receive event notifications when the corresponding changes occur in the naming/directory service.

| JNDI Overview