[ تنبيه ] how to deal withe USBListner in java

Hello everybody !

In my graduation project we need to read bits from a pic , as a first step of learning we build this java code and we have an error ,

could you please help me to run its correctly

java code :

import java.util.*;
import javax.usb.*;
/**
 *
 * @author tasneem
 */
public class USBListner {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws UsbException {
        // TODO code application logic here
        UsbServices services = UsbHostManager.getUsbServices();
        UsbHub root = services.getRootUsbHub();
        listDevices(root);
    }

    private static void listDevices(UsbHub hub) {
         List devices = hub.getAttachedUsbDevices();
         Iterator iterator = devices.iterator();
         while(iterator.hasNext()){
            UsbDevice device = (UsbDevice)iterator.next();
            System.out.print(device);
            if(device.isUsbHub())
                listDevices((UsbHub)device);
         }}
}
 

java error : in attachments i have added a snapshot

Thank you