public static void main(String[] args) throws Exception{
    Context context = new Context();
    int result = LibUsb.init(context);
    if (result != LibUsb.SUCCESS) {
        throw new LibUsbException("Unable to initialize libusb", result);
    }
    // use UsbDk
    result = LibUsb.setOption(context, LibUsb.OPTION_USE_USBDK);
    if (result != LibUsb.SUCCESS) {
        throw new LibUsbException("Unable to use UsbDk", result);
    }

    DeviceList deviceList = new DeviceList();
    int deviceCount = LibUsb.getDeviceList(context, deviceList);
    if (deviceCount > 0) {
        try {
            // Two printer's idVendor and idProduct is same
            int idVendor = 0x1fc9;
            int idProduct = 0x2016;
            Device device1 = null;
            Device device2 = null;
            for (Device device : deviceList) {
                DeviceDescriptor descriptor = new DeviceDescriptor();
                result = LibUsb.getDeviceDescriptor(device, descriptor);
                if (result != LibUsb.SUCCESS) {
                    throw new LibUsbException("Unable to read device descriptor", result);
                }
                if (device1 == null
                        && (descriptor.idVendor() & 0xffff) == idVendor
                        && (descriptor.idProduct() & 0xffff) == idProduct) {
                    device1 = device;
                } else if (device2 == null
                        && (descriptor.idVendor() & 0xffff) == idVendor
                        && (descriptor.idProduct() & 0xffff) == idProduct) {
                    device2 = device;
                }
            }

            assert device1 != null;
            assert device2 != null;
            testConcurrentOpen(device1);
            testConcurrentOpen(device2);

            // wait for completion ...
            Thread.sleep(5000);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            LibUsb.freeDeviceList(deviceList, true);
        }
    }
}

private static void testConcurrentOpen(final Device device) throws Exception {
    Thread thread = new Thread(() -> {
        try {
            DeviceHandle handle = new DeviceHandle();

            // This will fail if use UsbDk, errorCode : -99 Other error
            int result = LibUsb.open(device, handle);
            if (result != LibUsb.SUCCESS) {
                throw new LibUsbException("Unable to open device", result);
            }

            // do something ...
            Thread.sleep(1000);

            LibUsb.close(handle);
        } catch (Exception e) {
            e.printStackTrace();
        }
    });
    thread.setDaemon(true);
    thread.start();
}