/** * Updates the default {@code @Produces} list of every controller method whose list is empty. * The new list contains a single media type: "text/html". * * @param r resource to process. * @return newly updated resource. */ private static Resource processResource(Resource r) { final boolean isControllerClass = isController(r); Resource.Builder rb = Resource.builder(r); r.getAllMethods().forEach( (ResourceMethod m) -> { if ((isController(m) || isControllerClass) && m.getProducedTypes().isEmpty()) { final ResourceMethod.Builder rmb = rb.updateMethod(m); rmb.produces(MediaType.TEXT_HTML_TYPE); rmb.build(); } } ); r.getChildResources().forEach(cr -> { rb.replaceChildResource(cr, processResource(cr)); }); return rb.build(); }