Java to JavaScript to Native Code (j2js2nc)

JNA is a great Java library and I have used it for long time. So I developed j2js2nc from JNA 4.1 code to support Emscripten on Nashorn (Java 8's JavaScript Engine).

How to use

• Write C code and save it as 'hello.c'

#include <stdio.h>
#include <stdlib.h>

void hello(char *name) {
 	printf("Hello, %s!\n", name);
}

• Compile 'hello.c' to 'js/hello.js' with Emscripten on your terminal

emcc hello.c  -s EXPORTED_FUNCTIONS="['_hello']" -o js/hello.js

• Write Java code and run it

package jp.hisano.sample;

import jp.hisano.j2js2nc.Library;
import jp.hisano.j2js2nc.Native;

public class Main {
    public interface Hello extends Library {
        void hello(String name);
    }

    public static void main(String[] args) throws Exception {
        Hello library = (Hello) Native.loadLibrary("hello", Hello.class);
        library.hello("j2js2nc");
    }
}

License

This library is licensed under the LGPL, version 2.1 or later, and the Apache Software License, version 2.0, because JNA is licensed under them.