During 2015 Frank, Tobias and I published multiple articles in the German “Java Magazin” which cover Apache Kafka related topics such as basic fundamentals, the use of the Schema Registry and the REST Proxy. S&S Media decided to combine those articles in a lightweight eBook which is available in their online store as well as in the Kindle Shop.
The sample source code can (as always) be found on GitHub: Basic Messaging, Schema Registry & REST Proxy.