This repository contains the code for a demo application for GraalVM.

• GraalVM for Java 11 or higher
• Node.js support
• R support
• Ruby support

1. Download and install GraalVM. You can download the latest GraalVM here.

2. Add Node.js and R runtime support. GraalVM comes with gu which is a command line utility to install and manage additional functionalities, and to install Node.js and R, run this single command:

<graalvm>/bin/gu install nodejs R ruby

Check the Node.js version:

node -v

3. Download or clone the repository and navigate into the functionGraphDemo directory:

git clone https://github.com/graalvm/graalvm-demos
cd graalvm-demos/functionGraphDemo

4. Build the application by running npm install.

Now you are all set to run the polyglot JavaScript, Java, R application.

To run the application, you need to execute the server.js file providing --jvm and --polyglot flags:

$JAVA_HOME/bin/node --jvm --polyglot server.js

If you would like to run the benchmark on a different instance of Node, you can run it with whatever node you have. However, usually the polyglot capability will not be supported and the app will not run successfully.

Open localhost:8088 and enjoy the output. Play with the source code, for example, type 1 * 7 in a function field and press "Draw Function". Restart the application to see what else can you do with the mix of JavaScript, Java, and R.

GraalVM supports debugging polyglot applications too, add the --inspect parameter to the command line, open the URL the application prints at the startup in Chrome browser. You can debug, set breakpoints, evaluate expressions in this app in the JavaScript and R code alike.