Unifies JNI usage across native targets, offering rich type-conversion helpers, annotation-driven generation of C-style JNI stubs, and seamless Java-to-native calls that remove boilerplate.
Kotlin-JNI is a powerful Kotlin Multiplatform library designed to simplify and unify JNI (Java Native Interface) development across Android, Desktop (Linux, macOS, Windows), and Kotlin/Native.
It provides a common JNI interface for all supported native targets and includes a KSP module to automatically generate JNI-compatible function stubs, eliminating boilerplate and bridging the gap between your native Kotlin code and the Java world.
I want to express great gratitude to the original creator @DatL4g for the idea and execution. This project indeed makes JNI on Kotlin painless and effortless.
However, since the original repository no longer has a permissive license, this repository had to be created, based on the older, Apache-licensed version.
Use expect/actual definitions to seamlessly integrate JVM and Native code.
Works across androidNative, linux, macos, and mingwX64 targets.
A rich set of extension functions to effortlessly convert between JNI types and standard Kotlin types (e.g., jstring.toKString(), IntArray.toJIntArray()).
Automatic wiring of Kotlin source sets, bundling Kotlin/Native artifacts and loading those at runtime.
You can use standard Kotlin types for making calls between JVM and Native.
@JniCall@JniCallbackPass Kotlin primitives, Strings, ByteArrays, as well as ByteBuffers and custom types using serializers.
Please read the full documentation.
Feel free to create Pull Requests and Issues. I will do my best to address them.
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