code: boolean checkAccessTopicGlobalAC(UserContext ctx, String topic) throws IllegalAccessException {
  		logger.debug("Looking for accessController for topic '{}' from GlobalAccess", topic);
  		Iterable<JsTopicAccessController> accessControls = topicAccessController.select(DEFAULT_AT);
  		return checkAccessTopicFromControllers(ctx, topic, accessControls);
  	}
docs: Check if global access control is allowed
  @param ctx
  @param topic
  @return true if at least one global topicAccessControl exist
  @throws IllegalAccessException