At the moment it is not possible to expose rest services via the osgi container. This is probably an issue with our http web bridge. Implementing rest services within osgi, need to be done in form of a servlet. See https://github.com/OpenNMS/opennms/blob/develop/features/datachoices/src/main/java/org/opennms/features/datachoices/web/internal/ApiServlet.java for example.
Instead, using apache cxf with its <jaxrs:server> syntax should be used (http://cxf.apache.org/docs/jaxrs-services-configuration.html)