JavaScript and Java scored high as both most liked and most disliked programming languages in JetBrains’ State of the Developer Ecosystem survey. Perl was far and away the most disliked language.

First of all, JavaScript is not Java. It has nothing to do with Java (The language and its associated technologies from Sun Microsystems). To be honest, I'm not even sure why it's called JavaScript.

To call Nashorn JavaScript from a Java 8 program, you basically need to make a new ScriptEngineManager instance and use that ScriptEngineManager to load the Nashorn script engine by name.