"published": "2025-01-15",
  "tags": ["crawler", "extractor", "json"],
  "content": {
    "summary": "This is a sample JSON document for testing",
    "body": "The extractor should handle nested objects and arrays properly"
  },
  "metadata": {
    "created_at": "2025-01-01T00:00:00Z",
    "updated_at": "2025-01-15T12:00:00Z"
  }

    }
}
```

## Links

Check out [Fess Crawler](https://github.com/codelibs/fess-crawler) for more information.

## Conclusion

import org.codelibs.fess.crawler.exception.ExtractException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class to verify proper resource management in Extractor implementations.
 * This test ensures that resources are properly closed even when exceptions occur.
 */
public class ExtractorResourceManagementTest extends PlainTestCase {

    void setObjectTags(String objectName, Map<String, String> tags);

    /**
     * Ensures the bucket exists, creating it if necessary.
     */
    void ensureBucketExists();

    /**
     * Checks if storage is properly configured and accessible.
     *
     * @return true if storage is available
     */
    boolean isAvailable();

    /**
     * Closes the client and releases resources.
     */
    @Override

 *
 * <p>Thread Safety: This class is thread-safe. Each evaluate() call creates
 * a new GroovyShell instance to ensure thread isolation.</p>
 *
 * <p>Resource Management: GroovyClassLoader instances are properly managed
 * and cleaned up after script evaluation to prevent memory leaks.</p>
 */
public class GroovyEngine extends AbstractScriptEngine {
    private static final Logger logger = LogManager.getLogger(GroovyEngine.class);

            assertEquals("Resource not found: non/existent/resource.json", e.getMessage());
            // Test passes - exception was thrown as expected
        }
    }

    /**
     * Test that resource content is properly read using readAllBytes.
     * Verifies that the new implementation correctly reads entire resource content.
     */
    @Test
    public void testResourceReading_readAllBytesCorrectness() throws Exception {

import jakarta.annotation.PostConstruct;
import jakarta.annotation.Resource;

/**
 * A factory class for managing and creating crawler clients based on URL patterns.
 * This class implements AutoCloseable to properly handle resource cleanup.
 *
 * <p>The factory maintains a map of regular expression patterns to crawler clients,
 * allowing for URL-based client selection. Clients can be added with specific patterns

 * and handling the overall crawling lifecycle.
 *
 * <p>It implements the Runnable interface to be executed in a separate thread,
 * and the AutoCloseable interface to ensure resources are properly released after use.
 *
 * <p>The crawler uses several services and components, such as UrlQueueService, DataService,
 * UrlFilter, RuleManager, CrawlerContainer, IntervalController, and CrawlerClientFactory,

        suggester.shutdown();
    }

    /**
     * Test EXPECTED_INDEX_COUNT constant value.
     * Verifies that the constant is properly defined with expected value.
     */
    @Test
    public void testExpectedIndexCountConstant() throws Exception {
        final Field field = Suggester.class.getDeclaredField("EXPECTED_INDEX_COUNT");

```

---

## Best Practices for AI Assistants

### When Adding Features

1. Read existing code first (use symbol overview tools)
2. Follow existing patterns
3. Add tests
4. Handle resources properly (try-with-resources)
5. Consider thread safety
6. Update JavaDoc

### When Fixing Bugs

1. Write failing test first
2. Understand root cause
3. Minimal changes
4. Verify no regressions