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## Package javax.portlet

The javax.portlet package defines the API for Java Portlet Specification V2.0.

See:
Description

Interface Summary
ActionRequest | The `ActionRequest` represents the request sent to the portlet to handle an action.
ActionResponse | The `ActionResponse` interface represents the portlet response to an action request.
PortalContext | The `PortalContext` interface gives the portlet the ability to retrieve information about the portal calling this portlet.
Portlet | The `Portlet` interface is used by the portlet container to invoke the portlets.
PortletConfig | The `PortletConfig` interface provides the portlet with its configuration.
PortletContext | The `PortletContext` interface defines a portlet view of the portlet container.
PortletPreferences | The `PortletPreferences` interface allows the portlet to store configuration data.
PortletRequest | The `PortletRequest` defines the base interface to provide client request information to a portlet.
PortletRequestDispatcher | The `PortletRequestDispatcher` interface defines an object that receives requests from the client and sends them to the specified resources (such as a servlet, HTML file, or JSP file) on the server.
PortletResponse | The `PortletResponse` defines the base interface to assist a portlet in creating and sending a response to the client.
PortletSession | The `PortletSession` interface provides a way to identify a user across more than one request and to store transient information about that user.
PortletURL | The `PortletURL` interface represents a URL that reference the portlet itself.
PreferencesValidator | The `PreferencesValidator` allows to validate the set of preferences of the associated portlet just before they are stored in the persistent store.
RenderRequest | The `RenderRequest` represents the request sent to the portlet to handle a render.
RenderResponse | The `RenderResponse` defines an object to assist a portlet in sending a response to the portal.

Class Summary
GenericPortlet | The `GenericPortlet` class provides a default implementation for the `Portlet` interface.
PortletMode | The `PortletMode` class represents the possible modes that a portlet can assume.
PortletSessionUtil | The `PortletSessionUtil` class helps identify and decode attributes in the `PORTLET_SCOPE` scope of the PortletSession when accessed through the HttpSession an from within calls to methods of the HttpSessionBindingListener interface.
WindowState | The `WindowState` class represents the possible window states that a portlet window can assume.

Exception Summary
PortletException | The `PortletException` class defines a general exception that a portlet can throw when it is unable to perform its operation successfully.
PortletModeException | The `PortletModeException` is thrown when a portlet tries to use or set a portlet mode that is not supported by the current runtime environment or the portlet.
PortletSecurityException | A portlet should throw a `PortletSecurityException` when a call fails because of security reasons. Additionally it can be thrown by the portal/portlet-container.
ReadOnlyException | The `ReadOnlyException` is thrown when a portlet tries to change the value for a read-only preference attribute.
UnavailableException | The portlet should throw the `UnavailableException` when the portlet is either temporarily or permanently unavailable to handle requests.
ValidatorException | The `ValidatorException` is thrown by the `validate` method of a PreferencesValidator when the validation of a preference failed.
WindowStateException | The `WindowStateException` is thrown when a portlet tries to use a window state that is not supported by the current runtime environment or the portlet.

## Package javax.portlet Description

The javax.portlet package defines the API for Java Portlet Specification V2.0.

A portlet is a Java technology based web component, managed by a portlet container, that processes requests and generates dynamic content. Portlets provide a presentation layer to Information Systems.

Portlets generate fragments of markup (e.g. HTML, XHTML, WML). A portal combines markup fragments generated by different portlets into a portal page.

A portlet container manages the lifecyle of portlets. It also provides the required runtime environment.

Portlets are bundled in Portlet Applications as web applications using the WAR file format. A portlet application consists of two deployment descriptors: one to specify the web application resources (web.xml) and one to specify the portlet resources (portlet.xml).

Click here for an example of a portlet resources deployment descriptor (portlet.xml).

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