Skip to content

Latest commit

 

History

History

polyglot-javascript-java-r

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
README.md
README.md
 
 
build.sh
build.sh
 
 
package.json
package.json
 
 
run.sh
run.sh
 
 
server.js
server.js
 
 

README.md

Polyglot JavaScript Application mixing Java and R

This is a multi-language JavaScript application mixing Java and R to demonstrate GraalVM's polyglot capabilities.

Prerequisites

Note: FastR is no longer under active development and is in maintenance mode. The last released version is 22.3.0.

Preparation

  1. Download and install GraalVM 22.3.0 with the Node.js, and R languages support, using the GraalVM JDK Downloader.

    bash <(curl -sL https://get.graalvm.org/jdk) graalvm-ce-java17-22.3.0 -c 'nodejs,R'

    Follow the post-install message.

  2. Download or clone the repository and navigate into the polyglot-javascript-java-r directory:

    git clone https://github.com/graalvm/graalvm-demos
    cd graalvm-demos/polyglot-javascript-java-r

  3. Build the benchmark. You can manually execute npm install, but there is also a build.sh script included for your convenience:

    ./build.sh

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

Running the Application

To run the application, you need to execute the server.js file. You can run it with the following command (or run the run.sh script):

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

Open localhost:3000 and enjoy the output of the polyglot app. Play with the source code and restart the application to see what else can you do with the mix of JavaScript, Java, and R.

Debugging Polyglot Applications

GraalVM 22.3.x supports debugging polyglot applications too. Add the --inspect parameter to the command line: $JAVA_HOME/bin/node --jvm --polyglot --inspect server.js. Open the URL the application prints at the startup in Chrome browser, and start debugging, set breakpoints, evaluate expressions in this app in the JavaScript and R code alike.

A Note About the Application

This is a sample application that for brevity contains reasonably large snippets of code inside the strings. This is not the best approach for structuring polyglot apps, but the easiest to show in a single file.