Jpcap does not work in threads

Question

Hello there!
The problem is next:
I'm using jpcap lib for packet sniffer. As ordinary user has more than one device, I'm trying to use it as threads. But it doesn't work at all :(
Single process runs well, but this stops at the very beginning with no error at all. Just stops.
  public DeviceSniffer(int device) {
    System.out.println("Start of initialization device number "+device);
    this.requestCount = 0;
    this.responseCount = 0;
    this.deviceNumber = device;
    this.requestMessages = new ArrayList<RequestMessage>(REQUEST_LIMIT);
    this.incompleteRequestMessages = new ArrayList<RequestMessage>(
        REQUEST_LIMIT);
    this.responseMessages = new ArrayList<ResponseMessage>(REQUEST_LIMIT);
  public void run() {
    System.out.println("Sniffer started!");
    snifferStart();
  public void snifferStart() {
    try {
      NetworkInterface[] devices = JpcapCaptor.getDeviceList();
      System.out.println("Device: " + devices[deviceNumber].description);
      jpcap = JpcapCaptor.openDevice(devices[deviceNumber], 2000, false, 20);
      jpcap.setFilter("tcp", true);
      jpcap.loopPacket(-1, new DeviceSniffer(deviceNumber));
    catch (IOException e) {
      System.out.println("[E] ---");
  }and calling is like ordinary thread:
    NetworkInterface[] devices = JpcapCaptor.getDeviceList();
    for ( int i = 0; i < devices.length; i++ ){
      Thread t = new DeviceSniffer(i);
      t.start();
    }Does anybody have any solution? Or I should use any other lib/framework?
Kirill

Answer 1

Ok, if I re-write a bit thread calling:
    NetworkInterface[] devices = JpcapCaptor.getDeviceList();
    for ( int i = 0; i < devices.length; i++ ){
      Thread t = new DeviceSniffer(devices);
t.start();
}and DeviceSniffer: private NetworkInterface device;
public DeviceSniffer(NetworkInterface device){
this.device = device;
this.requestCount = 0;
this.responseCount = 0;
this.requestMessages = new ArrayList<RequestMessage>(REQUEST_LIMIT);
this.incompleteRequestMessages = new ArrayList<RequestMessage>(
REQUEST_LIMIT);
this.responseMessages = new ArrayList<ResponseMessage>(REQUEST_LIMIT);
private void startSniffer() throws Throwable {
System.out.println("Device: " + device.description);
jpcap = JpcapCaptor.openDevice(device, 2000, false, 20);
jpcap.setFilter("tcp", true);
jpcap.loopPacket(-1, new DeviceSniffer(device));
public void run() {
System.out.println("Sniffer started!");
try {
startSniffer();
catch (Throwable e) {
e.printStackTrace();
}it even starts caputiring, but...Sniffer started!
Device: Adapter for generic dialup and VPN capture
Sniffer started!
Device: TAP-Win32 Adapter V8 (Microsoft's Packet Scheduler)
Sniffer started!
Device: VMware Virtual Ethernet Adapter
Sniffer started!
Device: Intel(R) Wireless WiFi Link 4965AGN (Microsoft's Packet Scheduler)
Sniffer started!
Device: Broadcom NetXtreme Gigabit Ethernet Driver (Microsoft's Packet Scheduler)
Sniffer started!
Device: VMware Virtual Ethernet Adapter
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0b163b87, pid=5992, tid=5788
# Java VM: Java HotSpot(TM) Client VM (1.5.0_06-b05 mixed mode)
# Problematic frame:
# C [wpcap.dll+0x13b87]
.....some lines are missing...
[error occurred during error reporting, step 120, id 0xc0000005]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j jpcap.JpcapCaptor.setFilter(Ljava/lang/String;Z)V+0
j DeviceSniffer.startSniffer()V+52
j DeviceSniffer.run()V+9
v ~StubRoutines::call_stubDoes this mean that I can't access wpcap.dll in threads or, in other words, is it impossible to capture all devices at one time anisochronously?
Edited by: kirillica on Jan 30, 2008 4:27 AM
more info added