Package javax.portlet

The javax.portlet package defines the API for portlets.

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.
UnmodifiableException	The UnmodifiableException is thrown when a portlet tries to change the value for a preference attribute, marked as unmodifiable in the deployment descriptor with the non-modifiable tag, without the needed permissions.
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 portlets.

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).