libvirt users - May 2011 - Problems connecting to Virtualbox hypervisor using libvirt java binding

I am trying to connect to the virtualbox hypervisor through libvirt java
binding.

I am on Ubuntu 10.04 and I have installed libvirt-0.85, libvirt-java-0.4.6
and virtualbox-ose-dkms. I have configured libvirt project and its java
binding at Eclipse and the default test of the binding runs properly. When I
try to run a simple test in java with the connection:

conn = new Connect("vbox:///session", false)

I get the following exception: "exception caught:org.libvirt.

LibvirtException: Failed to start the nwfilter driver: Is the daemon running
?"

If I try to do the same thing, but instead of using the java biding I  use
virsh, it works. I am able to connect and start the virtual machine
successfully, although none of the nwfilter commands work in virsh.

(The nwfilter-list command shows this error:  Failed to list network
filters. This function is not supported by the connection driver:
virConnectNumOfNWFilters)

If I run the same java test using the Test hypervisor connection, things
work properly.

I don't know if I have to install or configure something else in order to
get the nwfilter working or if virtualbox doesn't provide support for it,
and if it doesn't provide, how can I get rid of this exception and use
virtualbox virtual machine connection through java binding ?

My objective is being able to use libvirt library commands in a software (in
java) which uses virtualization to run jobs in different machines, but
without the connection to the hypervisor I can't do anything.

I apologize if this question has been already answered. I have tried hard to
get the answers for it looking at forums and also in the discussions of this
list, but I couldn't.

What am I missing?

Thanks!

-- 
Tarciso Braz de Oliveira Filho
Graduando em Ci?ncia da Computa??o
LSD - Laborat?rio de Sistemas Distribu?dos
UFCG
2011
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2011/5/11 Tarciso Oliveira <tarcisocomp at
gmail.com>:
> I am trying to connect to the virtualbox hypervisor through libvirt java
> binding.
>
> I am on Ubuntu 10.04 and I have installed libvirt-0.85, libvirt-java-0.4.6
> and virtualbox-ose-dkms. I have configured libvirt project and its java
> binding at Eclipse and the default test of the binding runs properly. When
I
> try to run a simple test in java with the connection:
>
> conn = new Connect("vbox:///session", false)
>
> I get the following exception: "exception caught:org.libvirt.
>
> LibvirtException: Failed to start the nwfilter driver: Is the daemon
running
> ?"
This is actually a warning, but the Java bindings report it as an
exception. This is fixed in libvirt-java 0.4.7
> If I try to do the same thing, but instead of using the java biding I? use
> virsh, it works. I am able to connect and start the virtual machine
> successfully, although none of the nwfilter commands work in virsh.
That's expected because virConnectOpen doesn't actually fail and
therefore virsh ignores the warning.

Actually, recent libvirt stopped reporting this warning at all.

Matthias