Hotplug events do not fire when application is running inside of a docker container #90

Environment:

• OS: Debian Bullseye
• Java version Temurin JDK 21 (repeatable in Amazon Corretto 17 and 11 as well)
• usb4java version 1.3.0

Bug description
When running an application on Linux on the host, you can run a java application and have the attach and detach events fire. When running the same application in a Docker container, those events will not fire. Further, trying to manually poll the USB devices and compare old/new is not possible, as the devices returned from UsbHostManager.getUsbServices().getRootUsbHub() are always the same. Ex. When a device is no longer attached, it will still appear in the list if it was attached at startup.

Reproduction

1. Compile the code below into a jar file.

import javax.usb.UsbException;
import javax.usb.UsbHostManager;
import javax.usb.event.UsbServicesEvent;
import javax.usb.event.UsbServicesListener;

public class Application {

    public static void main(String[] args) throws UsbException, InterruptedException {
        UsbHostManager.getUsbServices().addUsbServicesListener(new UsbServicesListener() {
            @Override
            public void usbDeviceAttached(UsbServicesEvent event) {
                System.out.println("Device attached.");
            }

            @Override
            public void usbDeviceDetached(UsbServicesEvent event) {
                System.out.println("Device detached.");
            }
        });

        Thread.sleep(15000);
    }
}

3. Run on a linux machine with sudo. sudo java -Djava.security.egd=file:/dev/./urandom -jar app.jar
4. Connect and disconnect USB devices to see console output.
5. Build the jar into a container and use the below Dockerfile to build with sudo docker build --build-arg="JAR_FILE=app.jar" -t test1 .

FROM eclipse-temurin:21-jre-jammy
ARG JAR_FILE
COPY ${JAR_FILE} /usr/app/app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/usr/app/app.jar"]

6. Run the container with sudo docker run -it --rm --privileged test1:latest
7. Observe that connecting and disconnecting does not fire the event.

Expected behavior
I expect that the application running in a container with the correct privileges' would allow firing of the attach and detach events.