public static final String FESS_VAR_PATH = "fess.var.path";

    public static final String FESS_LOG_LEVEL = "fess.log.level";

    public static final String TRACK_TOTAL_HITS = "track_total_hits";

    public static final String SYSTEM_PROP_PREFIX = "fess.system.";

    public static final String FESS_CONFIG_PREFIX = "fess.config.";

    @ValidateTypeFailure
    public Integer offset;

    @ValidateTypeFailure
    public Integer pn;

    @Size(max = 1000)
    public String sdh;

    @Size(max = 100)
    public String track_total_hits;

    // advance

    @Override
    public int getStartPosition() {
        if (start == null) {
            start = ComponentUtil.getFessConfig().getPagingSearchPageStartAsInteger();
        }