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clojure-rust-graalvm

Rust

An example of Clojure program calling a Rust library, all combined into one executable using GraalVM.

Last updated Apr 14, 2026

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Topics

#clojure #graal-native #graalvm #jni #rust #rust-lang

Language breakdown

Rust 37.5%

Clojure 32.3%

Shell 22.3%

Java 7.8%

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README

clojure-rust-graalvm

An example of Clojure program calling a Rust library, all combined into one executable using GraalVM. It gets the amount of free memory via the heim-rs library and prints it in EDN format.

This repo is an adapted example of what is described in the README of the Rust jni library.

In clojure/src-java there is a Java static method which calls a Rust function via JNI. We call this static method from Clojure.

Usage

shell
$ time ./clojure-rust megabyte
{:memory/free [:megabyte "1210"]}
./clojure-rust megabyte   0.01s  user 0.01s system 34% cpu 0.027 total

Accepted options: byte, megabyte, gigabyte.

Build

Prerequisites:

Download GraalVM and set GRAALVMHOME
Install lein
Install cargo

Run script/compile to build the Rust lib, the Clojure uberjar and the GraalVM executable.

Finally, run the executable:

shell
$ target/clojure-rust
{:memory/free [:byte "896126976"]}

License

Distributed under the EPL License, same as Clojure. See LICENSE.

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