Making a connection to QEMU with Libvirt Java API

Question

i'm having a problem with connecting to QEMU with Libvirt API, here is the code:

import org.libvirt.Connect;
import org.libvirt.ConnectAuth;
import org.libvirt.ConnectAuthDefault;
import org.libvirt.LibvirtException;
import org.libvirt.NodeInfo;

public class Main 
{
  public static void main(String[] args)
  {
    System.setProperty("jna.library.path", "/home/johann/workspace/LibvirtTest/lib");
    try {
      ConnectAuth ca = new ConnectAuthDefault();
      Connect conn = new Connect("qemu+tcp://192.168.122.0/24", ca, 0);
      NodeInfo ni = conn.nodeInfo();

      System.out.println("model: " + ni.model + " mem(kb):" + ni.memory);

    } catch(LibvirtException le) {
       le.printStackTrace();
    }
  }
}

The problem is with the line

Connect conn = new Connect("qemu+tcp://192.168.122.0/24", ca, 0);

It makes the compiler throws this exception

Exception in thread "main" java.lang.UnsatisfiedLinkError:       com.sun.jna.Native.pointerSize()I
at com.sun.jna.Native.pointerSize(Native Method)
at com.sun.jna.Native.<clinit>(Native.java:88)
at org.libvirt.jna.Libvirt.<clinit>(Unknown Source)
at org.libvirt.Connect.<clinit>(Unknown Source)
at Main.main(Main.java:16)

I have found this address and port in the Virtual Machine Manager localhost QEMU details, but it doesn't seems to work...

Thanks in advance! :)

answer of this question is explained in this thread stackoverflow.com/questions/33208577/… — MirzaOsama Wahid
– MirzaOsama Wahid, Commented Oct 27, 2015 at 9:56

eye · Accepted Answer · 2013-09-25 14:53:13Z

1

It seems the address is not ok.

"qemu+type://loginname@ip:port/system" would be right.

In your case it seems 192.168.122.0/24 is an ip and subnetmask because /24 equals subnetmask 255.255.255.0 and doesn't belong here... If it is a port you have to write :24. Also /system is missing

qemu+tcp://192.168.122.0:24/system should do the job - if not try two things:

1st Get rid of :24 and test

2nd Add username as shown above and test

One of this possibilities should work assuming the rest of your code is correct. Have fun!

answered Sep 25, 2013 at 14:53

eye

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