Shared buffer via JNI

jni_test.c

struct data {
    float a;
    float b;
};

static jint com_example_test(JNIEnv *env, jobject thiz, jobject buffer) {
  struct data* pbuf = (data *)env->GetDirectBufferAddress(buffer);

  return 0;
}

static JNINativeMethod method_table[] = {
  { "native_test", "(Ljava/nio/ByteBuffer;)I",
         (void*)com_example_test }
};

jni_test.java

ByteBuffer buffer = ByteBuffer.allocateDirect(8);
buffer.order(ByteOrder.LITTLE_ENDIAN);

buffer.putFloat(0, a);
buffer.putFloat(4, b);

native_test(buffer);