Call Java method from JavaScript executed in Java

package pkg;

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

public class HelloJavaScript {

	public void run() {

		System.err.println("hello!");

	}

	public static void main(String[] args) {

		// see
		// https://developer.mozilla.org/ja/docs/Rhino/Scripting_Java
		// These packages are likely not in the java package, so you'll need to
		// prefix the package name with "Packages."

		// Get the JavaScript engine
		ScriptEngineManager manager = new ScriptEngineManager();
		ScriptEngine engine = manager.getEngineByName("JavaScript");

		String script = "" //
				+ "var obj = new Packages.pkg.HelloJavaScript();" //
				+ "obj.run();" //
		;

		try {
			engine.eval(script);
		} catch (ScriptException e) {
			e.printStackTrace();
		}

	}

}

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