code: private JsonNode parseLanguageResource(Resource resource) throws IOException {
  
          // Get resource stream
          InputStream stream = resource.asStream();
          if (stream == null)
              return null;
  
          // Parse JSON tree
          try {
              JsonNode tree = mapper.readTree(stream);
              return tree;
          }
  
          // Ensure stream is always closed
          finally {
              stream.close();
          }
  
      }
docs: Parses the given language resource, returning the resulting JsonNode.
  If the resource cannot be read because it does not exist, null is
  returned.
  
  @param resource
  The language resource to parse. Language resources must have the
  mimetype "application/json".
  
  @return
  A JsonNode representing the root of the parsed JSON tree, or null if
  the given resource does not exist.
  
  @throws IOException
  If an error occurs while parsing the resource as JSON.