Using JavaScript from Java class (and vice versa)

ScriptTest.java

import java.util.List;

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

public class ScriptTest {
	public final String hello = "Hello";
	
	public String getStr() {
		return hello;
	}

	public static void main(String[] args) {
		ScriptEngineManager scriptManager = new ScriptEngineManager();

		List<ScriptEngineFactory> listOfFactories = scriptManager.getEngineFactories();
		for (ScriptEngineFactory factory : listOfFactories) {
			System.out.println(factory.getEngineName() + " " + factory.getLanguageName());
			for (String name : factory.getNames()) {
				System.out.println( "   " + name);
			}
		}

		ScriptEngine scriptEngine = scriptManager.getEngineByName("js");
		
		try {
			Integer myInt = (Integer)scriptEngine.eval("2+3");
			System.out.println(myInt);

			scriptEngine.eval("var Test = Java.type('ScriptTest'); var test = new Test(); var rs = test.getStr(); print(rs)");
		} catch (ScriptException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}