[vbox-dev] XPCOM error NS_ERROR_FACTORY_NOT_REGISTERED

Frank Mehnert Frank.Mehnert at Sun.COM
Mon May 25 02:47:25 PDT 2009


On Saturday 23 May 2009, Eduardo Robles Elvira wrote:
> On Fri, Apr 24, 2009 at 12:30 PM, Eduardo Robles Elvira
>
> <edulix at gmail.com> wrote:
> > Hola!
> >
> > Precisely I'm working in a patch to make virtualbox host-only and
> > internal networks work in "mesh" mode. So that I can configure each
> > interface connected to a network to which other network interfaces is
> > it directly connected to. I want to do that for testing using
> > virtuabox my final project which is an implementation of the AODV mesh
> > networks routing protocol. Yesterday I "finished" the patch i.e. it
> > compiles and in theory it should work but I didn't have enough time
> > yet to test it. I attach it to this email so that others can review
> > the patch and/or help me developing it. My final aim is that it works
> > and it gets integrated in trunk :P. Any comments about this patch are
> > welcome!
> >
> > Regards,
> >      Eduardo Robles Elvira.
>
> Hi everyone,
>
> This is a follow-up of  my patch for mesh networks. I'm testing it,
> but I get the XPCOM error "NS_ERROR_FACTORY_NOT_REGISTERED". The error
> shows up when I try to start a VM, when I click configure, when I
> fininsh the new VM assistant, etc. The error shows up in this code:
>
> src/VBox/Frontends/VirtualBox/src/VBoxSelectorWnd.cpp:981
>     void VBoxSelectorWnd::vmStart():
>         session.createInstance (CLSID_Session);
>         if (session.isNull())
>         {
>             vboxProblem().cannotOpenSession (session); <<<<<<<<<<<<
>             return;
>         }
> src/VBox/Frontends/VirtualBox/src/VBoxSelectorWnd.cpp:844
>     void VBoxSelectorWnd::vmSettings():
>         // open a direct session to modify VM settings
>         QString id = item->id();
>         CSession session = vboxGlobal().openSession (id);
>         if (session.isNull())
>             return;
>
>         src/VBox/Frontends/VirtualBox/src/VBoxGlobal.cpp:2363
>             CSession VBoxGlobal::openSession (const QString &aId, bool
> aExisting /* = false */)
>             {
>                 CSession session;
>                 session.createInstance (CLSID_Session);
>                 if (session.isNull())
>                 {
>                     vboxProblem().cannotOpenSession (session); <<<<<<<<<<
>                     return session;
>                 }
>
> As you can see in the patch, I register a new XPCOM interface in
> src/VBox/Main/xpcom/module.cpp as I was told:
>
> +NS_DECL_CLASSINFO(NetworkAdapterRef)
> +NS_IMPL_THREADSAFE_ISUPPORTS1_CI(NetworkAdapterRef, INetworkAdapterRef)
>
> If I comment those two lines the error doesn't show up but well then
> NetworkAdapter related things obviosly don't work fine (rest of the
> patch is dependent of this). So.. I don't know what's happening, can
> someone please try to enlighten  me?

Hint: Use a debug build and try to start a VM like this:

  ./VBoxSVC

in one terminal and

  ./VirtualBox --startvm VM_NAME

in another terminal. This will show you the reason for your problem:

nsNativeComponentLoader: SelfRegisterDll(VBoxC.so) Load FAILED with 
error: /home/fm3/src/vbox/out/linux.x86/debug/bin/components/VBoxC.so: 
undefined symbol: _ZN17NetworkAdapterRefD1Ev

Fix: Remove the changes to xpcom/module.cpp from your patch.

After that you will get another assertion in CFGMR3AreValuesValid().
The reason is that you insert 'MeshEnabled' at the wrong place --
see your change in src/VBox/Main/ConsoleImpl2.cpp -- pCfg is not
correcly initialized.

Kind regards,

Frank
-- 
Dr.-Ing. Frank Mehnert    Sun Microsystems, Inc.    www.sun.com
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