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## Package javax.faces.component

Fundamental APIs for user interface components.

See:
Description

Interface Summary
ActionSource | ActionSource is an interface that may be implemented by any concrete `UIComponent` that wishes to be a source of `ActionEvent`s, including the ability to invoke application actions via the default `ActionListener` mechanism.
ActionSource2 | ActionSource2 extends `ActionSource` and provides a JavaBeans property analogous to the "`action`" property on `ActionSource`.
ContextCallback | A simple callback interace that enables taking action on a specific UIComponent (either facet or child) in the view while preserving any contextual state for that component instance in the view.
EditableValueHolder | EditableValueHolder is an extension of ValueHolder that describes additional features supported by editable components, including `ValueChangeEvent`s and `Validator`s.
NamingContainer | NamingContainer is an interface that must be implemented by any `UIComponent` that wants to be a naming container.
PartialStateHolder | Components that want to leverage the partial state saving feature must implement this interface instead of implementing `StateHolder`, from which this interface inherits.
StateHelper | Define a `Map`-like contract that makes it easier for components to implement `PartialStateHolder`.
StateHolder | This interface is implemented by classes that need to save their state between requests.
TransientStateHelper | Define a `Map`-like contract that makes it easier for components to implement `TransientStateHolder`.
TransientStateHolder | This interface is implemented by classes that need to save state that is expected to be available only within the scope of the current request.
UniqueIdVendor | UniqueIdVendor is an interface implemented by `UIComponents` that also implement `NamingContainer` so that they can provide unique ids based on their own clientId.
ValueHolder | ValueHolder is an interface that may be implemented by any concrete `UIComponent` that wishes to support a local value, as well as access data in the model tier via a value expression, and support conversion between String and the model tier data's native data type.

Class Summary
UIColumn | UIColumn is a `UIComponent` that represents a single column of data within a parent `UIData` component.
UICommand | UICommand is a `UIComponent` that represents a user interface component which, when activated by the user, triggers an application specific "command" or "action".
UIComponent | UIComponent is the base class for all user interface components in JavaServer Faces.
UIComponentBase | UIComponentBase is a convenience base class that implements the default concrete behavior of all methods defined by `UIComponent`.
UIData | UIData is a `UIComponent` that supports data binding to a collection of data objects represented by a `DataModel` instance, which is the current value of this component itself (typically established via a `ValueExpression`).
UIForm | UIForm is a `UIComponent` that represents an input form to be presented to the user, and whose child components represent (among other things) the input fields to be included when the form is submitted.
UIGraphic | UIGraphic is a `UIComponent` that displays a graphical image to the user.
UIInput | UIInput is a `UIComponent` that represents a component that both displays output to the user (like `UIOutput` components do) and processes request parameters on the subsequent request that need to be decoded.
UIMessage | This component is responsible for displaying messages for a specific `UIComponent`, identified by a `clientId` or component id relative to the closest ancestor `NamingContainer`.
UIMessages | The renderer for this component is responsible for obtaining the messages from the `FacesContext` and displaying them to the user.
UINamingContainer | UINamingContainer is a convenience base class for components that wish to implement `NamingContainer` functionality.
UIOutcomeTarget | This component is paired with the `javax.faces.Button` or `javax.faces.Link` renderers and encapsulates properties relating to the rendering of outcomes directly to the response.
UIOutput | UIOutput is a `UIComponent` that has a value, optionally retrieved from a model tier bean via a value expression, that is displayed to the user.
UIPanel | UIPanel is a `UIComponent` that manages the layout of its child components.
UIParameter | UIParameter is a `UIComponent` that represents an optionally named configuration parameter for a parent component.
UISelectBoolean | UISelectBoolean is a `UIComponent` that represents a single boolean (`true` or `false`) value.
UISelectItem | UISelectItem is a component that may be nested inside a `UISelectMany` or `UISelectOne` component, and causes the addition of a `SelectItem` instance to the list of available options for the parent component.
UISelectItems | UISelectItems is a component that may be nested inside a `UISelectMany` or `UISelectOne` component, and causes the addition of one or more `SelectItem` instances to the list of available options in the parent component.
UISelectMany | UISelectMany is a `UIComponent` that represents the user's choice of a zero or more items from among a discrete set of available options.
UISelectOne | UISelectOne is a `UIComponent` that represents the user's choice of zero or one items from among a discrete set of available options.
UIViewParameter | UIViewParameter represents a binding between a request parameter and a model property or `UIViewRoot` property.
UIViewParameter.Reference | Inner class to encapsulate a `UIViewParameter` instance so that it may be safely referenced regardless of whether or not the current view is the same as the view in which this `UIViewParameter` resides.
UIViewRoot | UIViewRoot is the UIComponent that represents the root of the UIComponent tree.

Exception Summary
UpdateModelException | This exception indicates a failure to update the model and is created to wrap any exception that occurs during `UIInput.updateModel(javax.faces.context.FacesContext)`.

Annotation Types Summary
FacesComponent | The presence of this annotation on a class automatically registers the class with the runtime as a `UIComponent`.

## Package javax.faces.component Description

Fundamental APIs for user interface components.

For your convenience here is a UML class diagram of the classes in this package.

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