@Resource
    protected ViewHelper viewHelper;

    /** Manager for handling application messages and internationalization. */
    @Resource
    private MessageManager messageManager;

    /** Manager for handling HTTP request operations. */
    @Resource
    private RequestManager requestManager;

    private static final String DICTIONARY_MANAGER = "dictionaryManager";

    private static final String DATA_SERVICE = "dataService";

    private static final String MESSAGE_MANAGER = "messageManager";

    private static final String INDEX_UPDATER = "indexUpdater";

    private static final String FILE_TYPE_HELPER = "fileTypeHelper";