A brief look at Graal

Hello.java

public class Hello {
    public static void main(String[] args) {
        String name = args.length > 0 ? args[0] : "World";
        System.out.println("Hello, " + name + "!");
    }
}

HelloPolyglot.java

import org.graalvm.polyglot.*;

public class HelloPolyglot {
    public static void main(String[] args) {
        String name = args.length > 0 ? args[0] : "World";
        System.out.println("Hello, " + name + ", from Java!");
        Context context = Context.create();
        context.getPolyglotBindings().putMember("name", name);
        context.eval("js",
                     "const name = Interop.import('name');\n" +
                     "print('Hello, ' + name + ', from JavaScript!');");
    }
}

polyglot.R

jsPlus = eval.polyglot('js', 'function(s1, s2) { return s1 + s2; }')
rubyOne = eval.polyglot('ruby', '1')
pythonOne = eval.polyglot('python', '1')
print(jsPlus(rubyOne, pythonOne))

The Java examples can be compiled with javac (assuming Graal’s bin is in the PATH) and run with java; instead of running them, you can also create native images with native-image (add --language:js for HelloPolyglot).