code: public <T> List<T> getChildEntries(Class<?> parentClass, String parentId,
  			Class<T> classs) throws RedmineException {
  		final EntityConfig<T> config = getConfig(classs);
  		final URI uri = getURIConfigurator().getChildObjectsURI(parentClass,
  				parentId, classs);
  
  		HttpGet http = new HttpGet(uri);
  		String response = getCommunicator().sendRequest(http);
  		final JSONObject responseObject;
  		try {
  			responseObject = RedmineJSONParser.getResponse(response);
  			return JsonInput.getListNotNull(responseObject,
  					config.multiObjectName, config.parser);
  		} catch (JSONException e) {
  			throw new RedmineFormatException("Bad categories response " + response, e);
  		}
  	}
docs: Delivers a list of a child entries.
  
  @param classs
  target class.