foo_jni.cpp

#include <stdlib.h>
#include "jni.h"

void nativeFoo();

int main(void) {
    JNIEnv* env;
    JavaVM* jvm;
    JavaVMInitArgs vm_args;
    JavaVMOption* options = new JavaVMOption[1];

    options->optionString = "-Djava.class.path=.";

    vm_args.version = JNI_VERSION_1_8;
    vm_args.options = options;
    vm_args.nOptions = 1;
    vm_args.ignoreUnrecognized = JNI_FALSE;

    jint i = JNI_CreateJavaVM(&jvm, (void**) &env, &vm_args);

    printf("> Env 0x%X\n", env);

    jclass cls = env->FindClass("Foo");

    const JNINativeMethod mds[] = {
        { "foo", "()V", (void*) nativeFoo } 
    };

    env->RegisterNatives(cls, mds, 1);

    printf("> Cls 0x%X\n", &cls);

    jmethodID mid = env->GetStaticMethodID(cls, "bar", "()V");

    printf("> Mid 0x%X\n", &mid);

    env->CallStaticVoidMethod(cls, mid);

    jvm->DestroyJavaVM();
    delete[] options;
}

void nativeFoo() {
    printf("Called nativeFoo\n");
}