jnetpcap - java.lang.UnsatisfiedLinkError: com.slytechs.library.NativeLibrary.dlopen(Ljava/lang/String;)J

Question

I am using IntelliJ to run a sample java-jnetpcap application. I have 64 bit JDK in the class path and included the following dependency

<dependency>
  <groupId>jnetpcap</groupId>
  <artifactId>jnetpcap</artifactId>
  <version>1.4.r1425-1f</version>
</dependency>

I am running the below sample.java class

public class PcapReaderDemo
{

private static final String filePath= "/src/main/resources/TAPcapture.pcap";

public static void main(String [] arguments){

final StringBuilder errbuf = new StringBuilder();
Pcap pcap = Pcap.openOffline(filePath,errbuf);
if (pcap == null) {
  System.err.printf("Error while opening device for capture: "
    + errbuf.toString());
  return;
}
PcapPacketHandler<String> jpacketHandler = new PcapPacketHandler<String>() {
  public void nextPacket(PcapPacket packet, String user) {
    System.out.printf("Received at %s caplen=%-4d len=%-4d %s\n",
      new Date(packet.getCaptureHeader().timestampInMillis()),
      packet.getCaptureHeader().caplen(), // Length actually captured
      packet.getCaptureHeader().wirelen(), // Original length
      user // User supplied object
    );
  }
};

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

It is throwing the below exception:

 PcapReaderDemo
 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 com.demo.myapexapp.PcapReaderDemo.main(PcapReaderDemo.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Please suggest your inputs on where it is going wrong.

Answer 1

I solved the same issue this way:

1. using Ubuntu 16.04

2. installing jre-1.8.0_181 manually:

   • download specific java version (https://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html) jre-8u181-linux-x64.tar.gz
   • create java directory: mkdir /opt/jre
   • extract java: tar -zxf jre-8u181-linux-x64.tar.gz
   • Update used java version: update-alternatives --install /usr/bin/java java /opt/jre/jre1.8.0_181/bin/java 100

3. Download, extract und copy jnetpcap files to lib directory

   • wget -O jnetpcap-1.4.r1425 https://downloads.sourceforge.net/project/jnetpcap/jnetpcap/Latest/jnetpcap-1.4.r1425-1.linux64.x86_64.tgz
   • tar -xvf jnetpcap-1.4.r1425
   • cp jnetpcap-1.4.r1425/libjnetpcap.so /lib/

4. Run your program