How to resolve a bundle fragment

[Jackson, Douglas]

Hi!
I am using karaf 4.2.2. I am trying to programmatically resolve a bundle 
fragment.
I can install the bundle with this:
         Bundle bundle = bundleContext.installBundle(bundlePath);
Then I try to resolve it by doing a refresh on the host bundle:
                    
bundle.adapt(FrameworkWiring.class).refreshBundles(Collections.singleton(bundle));
However, the adapt() call returns null.
Do I need to do the adapt() on a particular bundle?
-Doug