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As a general rule, service providers should not mix UI code with service
object code. For example, a Jini service object should not extend
a class from a user interface library, such as
javax.swing.JPanel. Nor should it contain dependencies
on any kind of UI library. Jini services, therefore, should not be designed
in the way that desktop applications have often been defined,
with UI code intermingled with functionality. The Jini service object
should encapsulate the functionality of the service, the whole functionality
of the service, and nothing but the functionality of the service.
Prior-knowledge Jini clients can just use the service object directly. Human
users can access the service via a "user adapter" object, and non-Jini
clients can access the service via a "protocol adapter"
To find out just how service providers and third parties should attach UIs to Jini services, and how clients can search for a best-fit UI, see the ServiceUI Project pages.
Note: This article did not appear in the Jiniology column at JavaWorld.