Scripting for the Java Platform
Scripting for the Java Platform is a framework for embedding scripts into Java source code. There is no requirement for a given Java virtual machine (JVM) to include any engines by default, but the Oracle JVM (Java 6 and later) includes a JavaScript engine, based on Rhino version 1.6R2 before Java 8, and Nashorn since Java 8.
Source: Wikipedia — Scripting for the Java Platform (CC BY-SA 4.0)