java error, jnetpcap library in eclipse

Question

I try to write simple sniffer, i would like to get list of devices. here is my function but doesn't work, i don't know what is wrong because i just started work with this library.

import java.util.ArrayList;
import java.util.List;
import java.io.*;

import org.jnetpcap.*;

public class sniffer
{
    public static void main(String[] args)
    {
        List<PcapIf> alldevs = new ArrayList<PcapIf>();
        StringBuilder errorbuf = new StringBuilder();

        //pobieranie listy urzadzen

        int r = Pcap.findAllDevs(alldevs, errorbuf);
        if (r == Pcap.NOT_OK || alldevs.isEmpty())
        {
            System.err.println("Can't read list of devices, error is: " +errorbuf.toString());
            return;
        }

    }
}

i don't understand what do with this:

Exception in thread "main" java.lang.UnsatisfiedLinkError: com.slytechs.library.NativeLibrary.dlopen(Ljava/lang/String;)J
        at com.slytechs.library.NativeLibrary.dlopen(Native Method)
        at com.slytechs.library.NativeLibrary.<init>(Unknown Source)
        at com.slytechs.library.JNILibrary.<init>(Unknown Source)
        at com.slytechs.library.JNILibrary.loadLibrary(Unknown Source)
        at com.slytechs.library.JNILibrary.register(Unknown Source)
        at com.slytechs.library.JNILibrary.register(Unknown Source)
        at com.slytechs.library.JNILibrary.register(Unknown Source)
        at org.jnetpcap.Pcap.<clinit>(Unknown Source)
        at sniffer.sniffer.main(sniffer.java:18)

score 1 · Answer 1 · answered Jul 10 '14 at 14:03

1

In Eclipse, under Configurations (Debug or Run), Arguments tab, in VM Arguments use the following:

-Djava.library.path=<path to jnetpcap.dll or libjnetpcap.so>

answered Jul 10 '14 at 14:03

fpga_magik

89
6

I added the path of libjnetpcap.so to VM Arguments like this but still getting the same error. – Al-Alamin Nov 08 '17 at 06:38

score 0 · Accepted Answer · answered May 25 '14 at 19:24

0

The above exception will be

Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.

try to check the path of JDK set properly pointing to correct library of java in buildpath.

and make sure correct jdk version is installed. no mess up with x86/x64 installs.`

answered May 25 '14 at 19:24

Karibasappa G C

2,686
1
18
27

I have win7 x32, and add jnetcap.jar to buildpath. – May 25 '14 at 19:32
jnetcap 1.3.0 and java 6 with 64bit ? – Karibasappa G C May 25 '14 at 19:34
so jdk is also 32 bit you downloaded and jnetcap version also compatible one ? – Karibasappa G C May 25 '14 at 19:46
oh, by accident i download jnetpcap for 64-bit -.- ,thanks for help :) i don't know that 1.4.0 is for 64, not 32. – May 25 '14 at 19:55
I am using JDK 1.8 and jnetpcap 1.4 in 64 bit linux pc(Works in windows). But nothing is working. can anyone give a download link from where their solution worked. – Al-Alamin Nov 08 '17 at 06:45

java error, jnetpcap library in eclipse

2 Answers2