GraalPolyglot.java

import java.io.File;
import java.io.IOException;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;

public class GraalPolyglot {
    public static void main(String[] args) throws IOException {
        Source source = Source.newBuilder("ruby", new File(args[0])).build();

        try (Context context = Context.newBuilder().allowAllAccess(true).build()) {
            context.eval(source);
        }
    }
}

Run.sh

$ java GraalPolyglot test.rb
1

$ java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-20191009173705.graal.jdk8u-src-tar-gz-b07)
OpenJDK 64-Bit GraalVM CE 19.2.1 (build 25.232-b07-jvmci-19.2-b03, mixed mode)

test.rb

Java.import 'javax.script.ScriptEngineManager'

mgr = ScriptEngineManager.new
js = mgr.getEngineByExtension("js")
js.eval("print(1)")