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UnavailableException - Exception in javax.portlet
The portlet should throw the UnavailableException when the portlet is either temporarily or permanently unavailable to handle requests.
UnavailableException(String) - Constructor for exception javax.portlet.UnavailableException
Constructs a new exception with a descriptive message indicating that the portlet is permanently unavailable.
UnavailableException(String, int) - Constructor for exception javax.portlet.UnavailableException
Constructs a new exception with a descriptive message indicating that the portlet is temporarily unavailable and giving an estimate of how long it will be unavailable.
USE_CACHED_CONTENT - Static variable in interface javax.portlet.MimeResponse
Property to tell the portlet container to use the cached markup for the validation token provided in the request.
useCachedContent() - Method in interface javax.portlet.CacheControl
Returns a boolean indicating whether the cached content for the provided ETag at the request can still be considerated valid.
USER_INFO - Static variable in interface javax.portlet.PortletRequest
Used to retrieve user information attributes with the getAttribute call.

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