[omniORB] Getting a servant pointer given a reference

[Clarke Brunt]

> In a nutshell, I am trying to figure out a way to get a 
> pointer to the 
> servent object given a reference.
> 
> So far, I have tried the following:
> 
> NodeProxy* NodeProxy::getNodeProxy (dom::Node_ptr node) {
> 
>     PortableServer::POA_var poa = server->getPOA() ;
>     PortableServer::ServantBase* serv = 
> poa->reference_to_servant(node);
>    
>     NodeProxy* nodeProxy = dynamic_cast<NodeProxy*>(serv);
>     // check to make sure it's not null
>     return nodeProxy;
> }   
> 
> With omniORB3 I get the following:
> 
> omniORB: ERROR -- trying to release an object with reference 
> count <= 0.
>  CORBA::release() may have been called too many times on an object
>  reference.
> 
> I have experimented with _add_ref() to no avail.
> 
> With omniORB4 I am just getting a segfault further down the track ;(

Perhaps I'm missing something, but the only bit of that code which appears
that it could possibly be wrong is the getPOA and the assignment of its
result to a POA_var. Is getPOA your own method, and does it duplicate the
POA before returning it? If it doesn't duplicate it, then the release in
POA_var's destructor would be inappropriate.

The docs say that reference_to_servant invokes _add_ref on the servant
before returning it, so a _remove_ref might be needed when you are finished
with it (possibly using ServantBase_var), but this would be the
responsibility of the caller of getNodeProxy, and doesn't appear to be
anything to do with your problem.

-- 
Clarke Brunt, Principal Software Engineer, Trafficmaster