};

        CrawlingParameterUtil.setUrlQueueService(service);

        // Verify it can be retrieved
        UrlQueueService<UrlQueue<?>> retrieved = CrawlingParameterUtil.getUrlQueueService();
        assertNotNull(retrieved);
        assertSame(service, retrieved);
    }

    public void test_urlQueueService_setNull() {
        // Set a service first
        @SuppressWarnings("unchecked")

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.HeadObjectRequest;
import software.amazon.awssdk.services.s3.model.HeadObjectResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;

/**

 * </p>
 * <ul>
 *   <li>{@code STORAGE_ENDPOINT}: The endpoint URL of the MinIO service.</li>
 *   <li>{@code STORAGE_ACCESS_KEY}: The access key for authentication.</li>
 *   <li>{@code STORAGE_SECRET_KEY}: The secret key for authentication.</li>
 *   <li>{@code STORAGE_REGION}: The region of the MinIO service.</li>
 * </ul>
 *
 * <p>

import org.codelibs.fess.crawler.CrawlerContext;
import org.codelibs.fess.crawler.entity.AccessResult;
import org.codelibs.fess.crawler.entity.UrlQueue;
import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.service.UrlQueueService;

/**
 * Utility class for managing crawling parameters using ThreadLocal variables.
 * This class provides methods to set and get various parameters related to the crawling process.

import org.codelibs.fess.crawler.entity.OpenSearchUrlQueue;
import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.service.UrlFilterService;
import org.codelibs.fess.crawler.service.UrlQueueService;
import org.codelibs.fess.crawler.service.impl.OpenSearchDataService;
import org.codelibs.fess.crawler.transformer.Transformer;
import org.codelibs.fess.crawler.util.OpenSearchResultList;

import org.codelibs.fess.crawler.filter.UrlFilter;
import org.codelibs.fess.crawler.interval.IntervalController;
import org.codelibs.fess.crawler.rule.RuleManager;
import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.service.UrlQueueService;

import jakarta.annotation.Resource;

/**
 * The Crawler class is the main class for web crawling. It manages the crawling process,

- Located in `app.web.*` or `app.web.admin.*`
- Methods with `@Execute` are web endpoints
- DI via `@Resource` annotation
- `HtmlResponse` for JSP, `JsonResponse` for APIs

### Services
- Business logic in `app.service.*`
- Injected into Actions
- Use behavior classes to access OpenSearch

### Helpers
- Cross-cutting utilities in `helper.*`
- Stateless, injected via DI

import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.service.FileConfigService;
import org.codelibs.fess.app.service.ScheduledJobService;
import org.codelibs.fess.app.service.WebConfigService;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.crawler.util.CharUtil;
import org.codelibs.fess.helper.ProcessHelper;

import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.pager.FileConfigPager;
import org.codelibs.fess.app.service.FileConfigService;
import org.codelibs.fess.app.service.LabelTypeService;
import org.codelibs.fess.app.service.RoleTypeService;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.helper.PermissionHelper;

import org.apache.logging.log4j.Logger;
import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.pager.FileAuthPager;
import org.codelibs.fess.app.service.FileAuthenticationService;
import org.codelibs.fess.app.service.FileConfigService;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.helper.SystemHelper;