assertNull(pathMappingHelper.getPathMappingList(sessionId));
        assertNull(pathMappingHelper.getPathMappingList(sessionId + "1"));
        pathMappingHelper.setPathMappingList(sessionId, pathMappingList);
        assertNotNull(pathMappingHelper.getPathMappingList(sessionId));
        assertNull(pathMappingHelper.getPathMappingList(sessionId + "1"));
        pathMappingHelper.removePathMappingList(sessionId);

    }

    public List<PathMapping> getPathMappingList(final String sessionId) {
        if (sessionId == null) {
            return null;
        }
        return pathMappingMap.get(sessionId);
    }

    public String replaceUrl(final String sessionId, final String url) { // for crawling
        final List<PathMapping> pathMappingList = getPathMappingList(sessionId);
        if (pathMappingList == null) {

public class PathMappingService extends FessAppService {

    @Resource
    protected PathMappingBhv pathMappingBhv;

    @Resource
    protected FessConfig fessConfig;

    public List<PathMapping> getPathMappingList(final PathMapPager pathMappingPager) {

        final PagingResultBean<PathMapping> pathMappingList = pathMappingBhv.selectPage(cb -> {

            searchPaging(data, form);
        });
    }

    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "pathMappingItems", pathMappingService.getPathMappingList(pathMapPager)); // page navi

        // restore from pager
        copyBeanToBean(pathMapPager, form, op -> op.include("regex", "replacement"));
    }

        validateApi(body, messages -> {});
        final PathMapPager pager = copyBeanToNewBean(body, PathMapPager.class);
        final List<PathMapping> list = pathMappingService.getPathMappingList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))

            ptList.add(Constants.PROCESS_TYPE_CRAWLING);
            ptList.add(Constants.PROCESS_TYPE_BOTH);
            pathMappingHelper.setPathMappingList(options.sessionId, pathMappingService.getPathMappingList(ptList));

            // duplicate host
            try {
                final DuplicateHostHelper duplicateHostHelper = ComponentUtil.getDuplicateHostHelper();
                duplicateHostHelper.init();