Hi Eric, I installed libvirt-0.10.2.tar.gz and now it is working correctly. i can run "virsh connect xen:///" and after "virsh list". After, I installed libvirt-java-0.4.9.tar.gz. I am trying to use test.java. I compiled using : javac -classpath /usr/java/jdk1.6.0_34/bin/libvirt-0.4.9.jar test.java And I runned using : java -classpath .:/usr/java/jdk1.6.0_34/bin/jna.jar:/usr/java/jdk1.6.0_34/bin/libvirt-0.4.9.jar test And I got this error that I do not know how to fix. Could you please help me? Best Regards, Felipe. libvir: Network Driver error : Requested operation is not valid: network is already active as 'createst' <=====================================> <============== FIXME ================> exception caught:org.libvirt.LibvirtException: Requested operation is not valid: network is already active as 'createst' level:VIR_ERR_ERROR code:VIR_ERR_OPERATION_INVALID domain:VIR_FROM_NETWORK hasConn:false hasDom:false hasNet:false message:Requested operation is not valid: network is already active as 'createst' str1:Requested operation is not valid: %s str2:network is already active as 'createst' str3:null int1:-1 int2:-1 <div class="gmail_quote">On Mon, Oct 1, 2012 at 6:39 PM, Eric Blake <<a href="mailto:eblake@redhat.com" target="_blank">eblake@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 10/01/2012 10:59 AM, Felipe Oliveira Gutierrez wrote: > Hi everyone, > > I am new using libvirt, > > Do I have to install libvirt-0.10.2.tar.gz alone, or I need to install > libvirt-java-0.4.9.tar.gz after to developing codes using java? </div>If you want to use the Java bindings, then yes, you have to install both libvirt and libvirt-java (if you are using a distro, installing libvirt-java should automatically pull in libvirt from the package dependencies). <div class="im"> > > But I don't find the libvirt.jar file to copy. </div>Unfortunately, I can't answer this one, since I haven't used the libvirt-java bindings myself. Maybe someone else can chime in. -- Eric Blake <a href="mailto:eblake@redhat.com">eblake@redhat.com</a> <a href="tel:%2B1-919-301-3266" value="+19193013266">+1-919-301-3266</a> Libvirt virtualization library <a href="http://libvirt.org" target="_blank">http://libvirt.org</a> </blockquote></div> -- <div>-- Felipe Oliveira Gutierrez</div> <div>-- <a href="mailto:lipe.82@gmail.com" target="_blank">lipe.82@gmail.com</a></div> <div>-- <a href="https://sites.google.com/site/lipe82/Home/diaadia" target="_blank">https://sites.google.com/site/lipe82/Home/diaadia</a></div>