Code originally designed by Simon ANGHOLOR under CPOL licence. see https://www.codeproject.com/Articles/245622/Using-the-Java-Native-Interface-in-Csharp for the original code base.

This project intent to provide a DLL to allow the use of a very minimal overlay to JNI functions in .net component, thus allowing to interact with a JVM to simply execute java functions and/or object following JNI convention.

It is NOT intended to create proxy classes like jni4net does for each java class : it is mostly exposing jvm functions to allow the use of JNI interface in c#, like you would use the jni.h header and the jvm.lib and dll files in C++ to run jni calls in C++.

We updated the original code from Simon ANGHOLOR to handle the AdoptOpenJDK 11. This project is currently targetting the following oracle jni spec : https://docs.oracle.com/en/java/javase/11/docs/specs/jni/

Building of the library has been tested under visual studio 2019 on a Windows 10 x64 with AdoptOpenJDK globally installed.

For java 9+ users : If you want to embed a custom JRE with your application, we provide a very simple powershell script that build a JRE using jdeps and jlink from a list of jars (that must include dependencies). Please check the samples\ApplicationWithIntegratedJRE project for more insights.

To retrieve JNI descriptors (parameters signatures) from a given jar, you can use this powershell call to retrieve all the class from you jar and print the methods signatures and parameters descriptors to use in jni calls.

cp ".\target\SampleJavaAppWithJRE-0.0.1-SNAPSHOT.jar" "$Env:TMP\SampleJavaAppWithJRE-0.0.1-SNAPSHOT.zip" ;`
    Expand-Archive -Force "$Env:TMP\SampleJavaAppWithJRE-0.0.1-SNAPSHOT.zip" "$Env:TMP\SampleJavaAppWithJRE-0.0.1-SNAPSHOT" ;`
    $classes=(Get-ChildItem -Path "$Env:TMP\SampleJavaAppWithJRE-0.0.1-SNAPSHOT\*.class" -Recurse);`
    javap -s $classes