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Jess in Action: Java Rule-Based Systems (In Action series) Paperback – July, 2003

4.5 out of 5 stars 15 customer reviews

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Product Details

  • Series: In Action series
  • Paperback: 480 pages
  • Publisher: Manning Publications (July 2003)
  • Language: English
  • ISBN-10: 1930110898
  • ISBN-13: 978-1930110892
  • Product Dimensions: 7.4 x 1.1 x 9.2 inches
  • Shipping Weight: 1.8 pounds
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (15 customer reviews)
  • Amazon Best Sellers Rank: #1,527,338 in Books (See Top 100 in Books)

Customer Reviews

Most Helpful Customer Reviews

30 of 30 people found the following review helpful By Eric on August 29, 2003
Format: Paperback
Jess in Action presents the Jess rule-based framework, and explores it through four meaty and well-chosen examples: a console tax forms advisor, a console PC repair assistant, a Swing HVAC controller, and a servlet-based purchasing agent. The examples vary greatly in their designs and styles of interaction between Jess and Java, and expose patterns in a concrete context. It's especially nice the way each example builds on the functionality of the one before, such as a text-based question/interview module that is extended into a Swing GUI.
The book starts with an introduction to rule-based systems, goes through the basics of the Jess language, and then dives into the examples; the appendices include API references to both Jess functions and Jess's Java APIs, and numerous links and references are scattered throughout the book. If I have any complaint about the organization, it's that the book could have been even more example-driven, abandoning (or shortening) the chapter on syntax and basic functions and introducing them only when used in an example; the rest could have been left to the appendix of Jess functions.
The book is interesting and readable but dense with concepts, so its only 388 pages of content and 50 pages of appendices will take some (well-spent) time to get through. A second skimming impressed me anew with the richness of the material, and the productive way in which it's presented, so I recommend reading the book once to get the overall feel, and then going through it again with the working Jess command shell, editor, and command line in front of you. Or an IDE if you must.
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19 of 19 people found the following review helpful By Thomas Paul VINE VOICE on August 28, 2003
Format: Paperback
Jess is a rule engine written in Java. This book is not about rules engines, although it does have a brief introduction to rules engines. This book is about Jess. In fact, this book is the book on Jess. If you are interested in learning what kind of problems Jess can be used to solve and how to use Jess to solve these problems then this book will answer your questions.
The book is basically divided into two sections. The first section is a tutorial on Jess. This section starts by showing how to install and configure Jess. The rest of this section covers the Jess syntax and demonstrates how to write rules for Jess. The tutorial is clearly written with some simple examples that do a good job of helping to make Jess understandable. The tutorial even shows how to do some optimizations for the rules that you write.
The rest of the book covers some fairly complicated applications written using Jess. The author refers to this section as a cookbook and the examples are complex enough and explained so well that it could easily serve this purpose. The best part of this section is that it will help someone who isn't familiar with rules engines develop ideas about how they might implement a rules engine to solve their own business requirements. The examples themselves cover integrating Jess with Java both in typical client based applications and J2EE web based applications.
If you are interested in using Jess as a possible solution to your business needs then this book is a virtual necessity. I couldn't imagine trying to use Jess without this book.
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15 of 15 people found the following review helpful By Jason C. Morris on August 17, 2005
Format: Paperback Verified Purchase
This review is a long time in coming, and I apologize to Dr. Friedman-Hill for not doing it sooner.

I have read Jess In Action (affectionately known as JIA to Jess developers) cover to cover at least ten times since first interviewing Dr. Friedman-Hill about Jess in the summer of 2003 -- see [...] Prior to that, I'd experimented with Jess since 4.0.

Dog-eared, annotated, and now held together by a rubber-band and Post-Its, JIA is always within reach when I'm programming Jess. It is a testament to Dr. Friedman-Hill's smooth yet dense style that every pass through revealed something that I missed before: the sign of a great book. All technical books start off like a roller-coaster, slowly ramping up the fundamentals and then hurling you through topical twists and turns towards the "advanced topics" and appendices that mark the end of the ride. Most times, I want my money back. Jess In Action is the first tech-tome in a long time that made me say, "Wow!! That was @#&* cool!" and head back to Chapter One for another ride.

Let me refute a few unfounded criticisms that I've seen:

1. JIA "...is more of a tutorial - not long enough to be a good reference."

It is true that this is more a collection of tutorials than a "cook-book" reference: this is by design. There are ample reference materials available with Jess's distribution, and to replicate those here would be extraneous. There is no substitute for doing your homework and reading the documentation if you want to be a competent Jess programmer. I recommend that you actually do this first, then get JIA. That way, it's like having Dr. Friedman-Hill explain Jess in-person.

2. JIA's "...early discussion of Jess syntax focuses too much on Java-like procedural style.
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