Internet of things, cloud and mobile are the major drivers for stream processing. Use cases are network monitoring, intelligent surveillance, but also less technical things such as inventory management or fraud detection. The book helps a lot to get a basic understanding about history, concepts and patterns of the stream processing paradigm.
I want to share my experiences with JRebel (http://www.zeroturnaround.com/jrebel/). If you need some neutral information about this product to ease development with J2EE / JEE applications and application servers, this blog entry is for you!