code: public StoredObject getObject(String id) {
          if (id.contains("..") || id.contains("/") || id.contains("\\")) {
              throw Exceptions.createHandled()
                              .withSystemErrorMessage(
                                      "Invalid object name: %s. A object name must not contain '..' '/' or '\\'",
                                      id)
                              .handle();
          }
          return new StoredObject(new File(file, id));
      }
docs: Returns the child object with the given id.
  
  @param id the name of the requested child object. Must not contain .. / or \
  @return the object with the given id, might not exist, but is always non null