Jini Example by Example

• For whom is Jini Example by Example written?
  Jini Example by Example is written for Java developers who are new to Jini and to distributed systems programming.

• What's the difference between Jini Example by Example and Core Jini?
  Jini Example by Example provides a more "gentle" introduction than Core Jini. Rather than being structured around the various aspects of the technology, it's structured around a series of example programs that build on each other.

  On a more specific note, Jini Example by Example has more up-to-date coverage of Jini Community projects such as ServiceUI and the Surrogate Architecture.

  In terms of example code, Jini Example by Example has a number of great, new examples, including a Jini chat service, a Jini file service, and others.

• What's the same between Jini Example by Example and Core Jini?
  Some of the early chapters in Jini Example by Example are essentially the same (although simplified) from text in Core Jini. For example, the text on how discovery works is pretty much the same. The appendix on RMI is also the same between both books. Why the same text? We thought those passages worked well in the contexts of both books, and didn't see the benefit of rewriting for rewriting's sake. The rest of the book's text (read: the places where it matters) is very different from Core Jini though.

• What should I know before starting Jini Example by Example?
  The book assumes that you know Java, and that's about it. The main text leads you through most of what you have to know to use RMI (Remote Method Invocation) in the Jini context, but isn't itself a tutorial on RMI.

• Should I buy both books?
  That depends on you, and what you want to get out of the books. If you start with Jini Example by Example and want to do more with Jini, you can "graduate" up to Core Jini. On the other hand, there are also a number of reasons one might want to buy Jini Example by Example after reading Core Jini. For example, Jini Example by Example has more up-to-date coverage of the ServiceUI framework and the Surrogate architecture. Perhaps more importantly, there are some significant new code examples in this book that show some fairly nifty software-based services. If you think you could benefit from any of the new material, or want to explore the new examples, you might want to take a look at Jini Example by Example.

Downloadable Code

NEW! This is the code bundle for Jini Example by Example. The version here requires Jini 1.1 to compile and run. (Last updated August 18, 2001.)

Bug fixes and errata

Chapters 2 and 3
Inconsistent overloading of createCurrencyProxy
The definition of the first version of the currency converter defined in class CurrencyConvertService (Listing 2.2, page 39) declares a method called createCurrencyProxy. Although this works perfectly well in Chapter 2, the amended services in Chapter 3 (class CurrencyConvertServiceBackend in Listing 3.6, page 88) assumes this is called createProxy and overloads this method to create a different proxy for the service. This code should overload the method createCurrencyProxy instead, and should have a different version of createCurrencyProxy. The updated code bundle above is correct.

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Keith Edwards
kedwards@kedwards.com