The first two chapters introduced ESB and JBI respectively, with much theory and less of code. Just like me, you too might have come across a lot of white papers and point of views on the above two technologies. However, when we want to actually implement them into our technical architectures, we need working code demonstrating both.

Just like any other Java APIs, servlet or EJB, for a JBI API too, we need concrete implementation. There are many implementations supporting ESB architectures available in the market today. A couple of them can interoperate with the JBI API whereas a few others tackle JBI on the side of quite a different programming model. ServiceMix is an open-source ESB platform in Java programming language, built from the ground up with JBI APIs and principles.

Due to the reason quoted in the first paragraph, we will use ServiceMix to better understand JBI and ESB. Hence, most of the subsequent chapters in this book will introduce new scenarios...