A Programmer’s Guide to Jini™ Technology by Jan Newmarch

By Jan Newmarch

To comprehend Jini, think which you could flow to a brand new place of work internationally, or cost into any hoteland may easily plug your computing device or Palm at once into the neighborhood community. Your gadget could instantly be famous, and also you may have entry to the prone at that location—transparently.

Jini is Sun's Java-based expertise, with capability to make transparant, "universal plug and play" a fact. This ebook is an increased, up-to-date model of the preferred on-line instructional for Jini. writer Jan Newmarch comprises complete Jini developments introduced at Java One in June 2000. And he comprises different vital issues, like how firm Java Beans mixture in with the Jini framework and the way CORBA suits in as well.

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Jar in its CLASSPATH. When run, it wil1 attempt to connect to the service locator, so obviously the service locator needs to be running on the machine specified in order for this to happen. Otherwise, the program will throw an exception and terminate. au. It could, however, be any machine accessible on the local or remote network (as long as it is running a service locator). For example, to connect to the service locator running on my current workstation, the parameter for LookupLocator would be jini: / /pandonia.

The old classes are supported for now, but are not approved. NoClassDefFoundError: net/jini/discovery/DiscoveryListener The Jini class files are all in jar files. The Jini distribution puts them in a lib subdirectory when they are unpacked. jar sun-util. jar jar file contains the major packages ofJini: net. j ini. jar file is in your CLASSPATH. discovery net. lease net. jar file is in your CLASSPATH. jini hierarchy. These contain a number of "convenience" classes that are not essential but can be useful.

Out. println ("found a service loca tor" ); II } } public void discarded(DiscoveryEvent evt) { } } II MulticastRegister 5taying Alive In the preceding constructor for the Mul ticastRegister program, we create a LookupDiscovery object, add a DiscoveryListener, and then the constructor terminates. The main () method, having called this constructor, promptly goes to sIeep. What is going on here? The constructor for LookupDiscovery actually starts up a number ofthreads to broadcast the service and to listen for replies (see Chapter 21).

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