public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            pathMapPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            pathMapPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminPathmap_AdminPathmapJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            groupPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            groupPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminGroup_AdminGroupJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            relatedQueryPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            relatedQueryPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminRelatedquery_AdminRelatedqueryJsp).renderWith(data -> {
            searchPaging(data, form);
        });

        assertEquals("present", presentOptional.orElse("default"));

        // Test with null value
        String nullValue = null;
        OptionalEntity<String> emptyOptional = OptionalUtil.ofNullable(nullValue);

        assertFalse(emptyOptional.isPresent());
        assertEquals("default", emptyOptional.orElse("default"));

        // Test that empty optional returns null instead of throwing

        validate(form, messages -> {}, this::asDictIndexHtml);
        pageNumber.ifPresent(num -> {
            charMappingPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            charMappingPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminDictMapping_AdminDictMappingJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

        valueMap.put("user", user.map(FessUserBean::getUserId).orElse("-"));
        valueMap.put("permissions",
                user.map(u -> stream(u.getPermissions()).get(stream -> stream.collect(Collectors.joining(permissionSeparator))))
                        .filter(StringUtil::isNotBlank)
                        .orElse("-"));
        log(valueMap);
    }

    /**

    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            boostDocPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            boostDocPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminBoostdoc_AdminBoostdocJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            fileConfigPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            fileConfigPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminFileconfig_AdminFileconfigJsp).renderWith(data -> {
            searchPaging(data, form);
        });
    }

    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            relatedContentPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            relatedContentPager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminRelatedcontent_AdminRelatedcontentJsp).renderWith(data -> {
            searchPaging(data, form);
        });

        validate(form, messages -> {}, this::asDictIndexHtml);
        pageNumber.ifPresent(num -> {
            stemmerOverridePager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            stemmerOverridePager.setCurrentPageNumber(0);
        });
        return asHtml(path_AdminDictStemmeroverride_AdminDictStemmeroverrideJsp).renderWith(data -> {
            searchPaging(data, form);