I tried to use exploded Wars with included and also exploded Web Fragments for shorter development turn arounds.
This didn't really work out because the WebappClassLoader ignores resources in META-INF/resources.
Example war directory structure:
If WebFragment.jar is packaged as Jar 'hello.html' is found fine.
Our workaround for now is to use custom javax.faces.view.facelets.ResourceResolver which first calls WebappClassLoader#getResource("META-INF/resources" + path) in Development project stage.