Error في كود Capture!

public class Capture implements Runnable{

public static void main(String[] args) {

Capture Thread=new Capture();

Thread object=new Thread(Thread);

object.start();

}

void Captur()

{

// declerations

JpcapCaptor jc_object;

JpcapWriter jw_object;

TCPPacket j_ob;

int ids,j;

Packet packet_id;

Packet packet_i;

NetworkInterface[]net_device = JpcapCaptor.getDeviceList();

try{

jc_object=

JpcapCaptor.openDevice(net_device[1], 65535, false, 200);

jw_object =

JpcapWriter.openDumpFile(jc_object,"ids_project.tcpdump");

for(ids=0;ids<10;ids++){

packet_id=jc_object.getPacket();

j_ob = (TCPPacket) packet_id; //هنا الخطأ

if(packet_id != null){

jc_object.setFilter("ip and tcp", true);

System.out.println("THE CAPTURE PACKET:");

System.out.println("..............................");

System.out.println("The Packet number :::: "+ids+" :::: ");

System.out.println("..............................");

System.out.println("Destination Port : "+j_ob.dst_port);

System.out.println("The Destination IP : "+j_ob.dst_ip);

System.out.println("Source Port : "+j_ob.src_port);

System.out.println("The Source IP : "+j_ob.src_ip);

System.out.println("Sequence Number : "+j_ob.sequence);

System.out.println("Window Size : "+j_ob.window);

System.out.println("The protocol embedded in the IP datagram : "+j_ob.protocol);

System.out.println("The IP length : "+j_ob.length);

System.out.println("The Offset : "+j_ob.offset);

System.out.println("The Flags :: ");

System.out.println("1.SYN : "+j_ob.syn);

System.out.println("2.Reset : "+j_ob.rst);

System.out.println("3.Push : "+j_ob.psh);

System.out.println("4.Urgent Pointer : "+j_ob.urg);

System.out.println("5.Acknowledgement : "+j_ob.ack);

System.out.println("6.Final : "+j_ob.fin);

jw_object.writePacket(packet_id);

}

}

jc_object.close();

jw_object.close();

}

catch (IOException e){

e.printStackTrace();

}

}

/* (non-Javadoc)

* @see java.lang.Runnable#run()

*/

public void run() {

// TODO Auto-generated method stub

while(true)

{

System.out.println("Start Captur TCP Packet:");

Captur();

}

}

}