How do I create an instance of ScriptEngine class for JavaScript?

This example demonstrates how to create a JavaScript interpreter or the ScriptEngine to run JavaScript in Java. The classes related to scripting is packaged under the javax.script.* package. In this example we show you how to create the JavaScript engine by using the engine extension.

package org.kodejava.script;

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;

public class GettingJavaScriptEngine {
    public static void main(String[] args) {
        // Creating an instance of ScriptManager. With ScriptManager in hand we
        // can create an interpreter or ScriptEngine to run JavaScript.
        ScriptEngineManager manager = new ScriptEngineManager();

        // Calling manager.getEngineByExtension("js") returns a ScriptEngine
        // implementation for JavaScript engine.
        ScriptEngine engine = manager.getEngineByExtension("js");

        // Do something with the script engine.
        System.out.println("Engine = " + engine);

The output of the code snippet:

Engine =

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