Java and Python Integration Example for GraalVM

This example demonstrates how to integrate Python on GraalVM with a Java application.

Prerequisites

• GraalVM
• Python support

Getting Started

• Download GraalVM Commuity or Enterprise and set your GRAALVM_HOME to point to it.

• Add the Python support. GraalVM comes with gu (GraalVM updater) which is a command line utility to install and manage additional functionalities. To install Python support run this single command:

$GRAALVM_HOME/bin/gu install python

• Compile the package:

mvn clean package

• Run the application:

java -jar ./target/graalvm-polyglot-1.0-SNAPSHOT.jar

You should get the following output:

JAVA: Hello from Java!
Python: Hello from Python code!
JAVA: Printing the "id" property of the object returned by the python code. ID=42

GraalVM available extensions

You can get the list of currently supported extensions (from GraalVM 22.0.0.2) with the following command:

$GRAALVM_HOME/bin/gu available

You will an output like that one:

ComponentId	Version	Component name	Stability	Origin
espresso	22.0.0.2	Java on Truffle	Experimental	github.com
espresso-llvm	22.0.0.2	Java on Truffle LLVM Java libr	Experimental	github.com
llvm-toolchain	22.0.0.2	LLVM.org toolchain	Experimental	github.com
native-image	22.0.0.2	Native Image	Experimental	github.com
nodejs	22.0.0.2	Graal.nodejs	Experimental	github.com
python	22.0.0.2	Graal.Python	Experimental	github.com
R	22.0.0.2	FastR	Experimental	github.com
ruby	22.0.0.2	TruffleRuby	Experimental	github.com
wasm	22.0.0.2	GraalWasm	Experimental	github.com