By Jan Newmarch
Java programmers drawn to studying and utilising Jini towards their respective community functions – any Java enabled machine interoperable with the other Java-enabled machine. Jini is Sun's Java-based know-how, with capability to make transparant, "universal plug and play" a truth. This booklet is an extended, up to date model of the preferred on-line instructional for Jini. writer Jan Newmarch comprises complete Jini developments. And he comprises different vital subject matters, like how company JavaBeans combination in with the Jini framework and the way CORBA matches in besides. This publication may be in accordance with Jini 2.0.
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Additional resources for Foundations of Jini 2 Programming
But this time it does something different, which is to request the service object to be copied across to it. This process is shown in Figures 1-7, 1-8, 1-9, and 1-10. Figure 1-7. Querying for a service locator Figure 1-8. fm Page 13 Friday, September 1, 2006 10:26 AM CHAPTER 1 ■ OVERVIEW OF JINI Figure 1-9. Asking for a service Figure 1-10. Service returned At this point, the original service object is running on its host, there is a copy of the service object stored in the lookup service, and there is a copy of the service object running in the client’s JVM.
The core classes are the same in each version. 1. 4 or later, not earlier versions of Java. 5 but does not require it. html. 0 are as follows: • LookupDiscovery (now has an additional constructor) • LeaseRenewalManager • ServiceIDListener The main new classes are as follows: • LookupLocatorDiscovery • LookupDiscoveryManager • ClientLookupManager If you get syntax errors or runtime errors relating to these classes, it is possible that you are using Jini 1 instead of Jini 2. If you get “deprecated” warnings, it is likely that you are using the Jini 1 classes in a Jini 2 environment.
Could Not Obtain Preferred Value When you receive a “Could not obtain preferred value for . ” message, it means that Jini can’t find a class file—something is wrong with the classpath or the codebase. This can occur if the codebase points to a directory, and the value is not terminated with a forward slash (/). ActivationSystem The command rmid starts the activation system running. If the activation system cannot start properly or dies just after starting, you will get this message. Usually it is caused by incorrect file permissions.
Foundations of Jini 2 Programming by Jan Newmarch