graalpy-jbang-qrcode

GraalPy JBang QRCode Demo

This demo illustrates how GraalPy can be used to embed the qrcode Python package in a script that runs on JBang.

Preparation

Install GraalVM for JDK 23 and set the value of JAVA_HOME accordingly. We recommend using SDKMAN!. (For other download options, see GraalVM Downloads.)

sdk install java 23-graal

Afterward, install jbang, for with:

sdk install jbang

Run the Application

To start the demo, run:

jbang run qrcode.java "Hello from GraalPy!"

Implementation Details

qrcode.java defines required dependencies on GraalPy, which also allows to depend on Python packages. //PIP qrcode==7.4.2 defines the dependency on the qrcode Python package. The main() method checks the arguments and then creates a new Context. It then fetches the qrcode Python module and maps it to a QRCode Java interface. Afterward, it uses the qrcode module as illustrated in this example through Java interfaces. Finally, it prints the result to System.out.