I've been playing around with open source workflow engines for quite some time, Enhydra Shark, JBoss jBPM, etc. At each attempt I feel like I'm playing with a black box, guessing at it's internal behavior, not understanding the results. I hadn't really considered OSWorkflow because it didn't have the 'press' of the other packages. Then I bought this book and found out how much fun one can really have with a workflow engine. All of the components are pluggable, as this book points out, repeatedly. If you don't like the behavior of a component, change it -- and here's how. Need a different persistent store, change it, customize it. This is truly a programmer's workflow engine and this book will appeal to programmers.



This book also shows how, with examples, how to integrate JBoss Rules (aka DROOLS), Quartz scheduling, and Esper complex event processing.



The only downside which I found was not with the book, but with the OSWorkflow distribution, the Hibernate support is old, v2.8.0. At first I was disappointed but with the help of this book, I just wrote my own Hibernate 3.x support in a matter of a few hours and I now know the package much more intimately as result. I went on to customize and *optimize* this for my project.



OSWorkflow is a great workflow engine, let's hope this book give the kick-start which it needs to be even better.

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