The author wrote: > For these scripts I decided to use JavaScript, primarily because it’s included in Java 6 and secondarily because many people know it Apach

The author wrote: > For these scripts I decided to use JavaScript, primarily because it’s included in Java 6 and secondarily because many people know it Apache Groovy isn't included in Java, and there's many incompatibilities between it and Java (e.g. behavior of ==), so perhaps that's why it lost out to Javascript for scripting.