GraalTest.java

gistfile1.txt

package test;

import javax.script.*;

public class GraalTest {

    public static void main(String[] args) {
        try {
            ScriptEngine engine = new ScriptEngineManager().getEngineByName("graal.js");
//            ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
            if (engine != null) {
                StringBuilder sb = new StringBuilder();
                sb.append("var Utils = Java.type('test.GraalTest');");
                sb.append("var obj = {};");
                sb.append("obj.n=100;");
                sb.append("print(''+ obj.n);");
                sb.append("Utils.passToJava(obj);");
                engine.eval(sb.toString());
            } else {
                System.out.println("null engine");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void passToJava(Object o) {
        System.out.println("class name = " + o.getClass().getName());
    }
}