OpenJDK is one of the most widely used open source implementations of the Java platform. It is used to change, customize, and tune core application internals and provide a way to extend the application internals according to your requirements.
OpenJDK Cookbook begins by introducing you to OpenJDK and IcedTea builds for various virtual machine implementations and how to deploy OpenJDK on multiple platforms. Furthermore, the book digs deeper into the development concepts, JVM internals, and techniques to make robust improvements or customizations to OpenJDK. Essentially, the book covers the best practices for accessing and using the core features of OpenJDK to build advanced Java solutions by utilizing the more complex and nuanced parts of OpenJDK.