When you use this book, it is expected that you understand the concepts of XML, XLST, WSDL, WebServices, JMS and SOAP and basic knowledge of SQL. This is not explained in the book. Which is a advantage! Refer to the w3schools for such things.
You can obtain it via Packt Publishing.
Some subjects I miss in the book; best practice on execption handing, throtteling, deployment.
The examples in the book are based Oracle Service Bus patch set #3, but can also be used on top of patch set #4. This release is already available since august 2010. Why didn't' the authors use this version? I expect that the examples in the book can also be applied on the upcoming patch set release #5.