Getting the JDK 9 early access build

If you are reading this book before Java 9 is officially released, then you can obtain a JDK 9 early access build from here--http://jdk.java.net/9/. Early release builds are available for Windows (32 and 64), macOS (64), Linux (32 and 64) and various Linux ARM, Solaris, and Alpine Linux versions.

Taking the time to test your applications for Java 9 and get them migrated before Java 9 is officially released, helps ensure you will not experience any downtime for services that rely on your Java applications.