code: public Map<String, String> getResourcePathToUriMappings() {
      if (resourcePathToUriMappings == null) {
        ImmutableMap.Builder<String, String> mapBuilder = ImmutableMap.<String, String>builder();
        // Ensure that resourcePath and uri ends with a '/'
        for (Map.Entry<String, String> mapping : mappings().entrySet()) {
          mapBuilder
              .put(ensureEndsWithSlash(mapping.getKey()), ensureEndsWithSlash(mapping.getValue()));
        }
        resourcePathToUriMappings = mapBuilder.build();
      }
      return resourcePathToUriMappings;
    }
docs: A series of mappings from resource paths (in the classpath)
  to the uri path that hosts the resource
  @return The resourcePathToUriMappings.