Before starting with writing code, make sure that you have an environment ready to work with Java EE. We need a Java Virtual Machine 8 (JVM 8) and, more particularly, the Java Development Kit 8 (JDK 8). As a quick reminder, Java EE version V is based on Java Standalone Edition (Java SE) version V as well. You can download the JDK on the Oracle website (http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html).
Alternatively, you can download the OpenJDK version of the JDK on the OpenJDK project website (http://openjdk.java.net/install/), but I recommend that you use the Oracle version. We will discuss this later in the book.
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