code: @SuppressWarnings("unchecked")
    private Iterator<String> findConfigRefs(@NotNull final Resource startResource, @NotNull final Collection<String> bucketNames) {
  
      // collect all context path resources (but filter out those without config reference)
      final Iterator<ContextResource> contextResources = new FilterIterator(contextPathStrategy.findContextResources(startResource),
          new Predicate() {
            @Override
            public boolean evaluate(Object object) {
              ContextResource contextResource = (ContextResource)object;
              return StringUtils.isNotBlank(contextResource.getConfigRef());
            }
          });
  
      // get config resource path for each context resource, filter out items where not reference could be resolved
      final Iterator<String> configPaths = new TransformIterator(contextResources, new Transformer() {
        @Override
        public Object transform(Object input) {
          final ContextResource contextResource = (ContextResource)input;
          String val = checkPath(contextResource, contextResource.getConfigRef(), bucketNames);
          if (val != null) {
            log.trace("+ Found reference for context path {}: {}", contextResource.getResource().getPath(), val);
          }
          return val;
        }
      });
      return new FilterIterator(configPaths, PredicateUtils.notNullPredicate());
    }
docs: Searches the resource hierarchy upwards for all config references and returns them.