current = current.getCause();
        }
        return buf.toString();
    }

    /**
     * Checks if a checkbox value represents an enabled state.
     * This method considers "on" and "true" (case-insensitive) as enabled values.
     *
     * @param value the checkbox value to check
     * @return true if the value represents an enabled checkbox, false otherwise
     */

 * </p>
 * <pre>
 * Map&lt;K, V&gt; syncMap = Collections.synchronizedMap(new LruHashMap&lt;&gt;(100));
 * </pre>
 * <p>
 * Alternatively, for high-concurrency scenarios, consider implementing a custom
 * LRU cache using {@link java.util.concurrent.ConcurrentHashMap} with an eviction strategy.
 * </p>
 *
 * @author koichik
 * @param <K> the key type
 * @param <V> the value type
 */

 * <li>For high-security applications, consider using AES with GCM mode via {@link #setAlgorithm(String)} and {@link #setTransformation(String)}</li>
 * <li>Ensure keys are securely generated and stored</li>
 * <li>For production systems with stringent security requirements, consider using authenticated encryption modes</li>
 * </ul>
 * <p>
 * <strong>Usage Example:</strong>
 * </p>

### 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

### When Refactoring

            }
            if (SpnegoHttpFilter.Constants.ALLOW_BASIC.equals(name)) {
                // SECURITY NOTE: Basic authentication is enabled by default for compatibility.
                // For production, consider setting spnego.allow.basic to false.
                return getProperty(SPNEGO_ALLOW_BASIC, "true");
            }
            if (SpnegoHttpFilter.Constants.ALLOW_UNSEC_BASIC.equals(name)) {

 *
 * # Default groups/roles for authenticated users
 * saml.default.groups=user
 * saml.default.roles=user
 * </pre>
 *
 * <h2>Security Settings (Production)</h2>
 * <p>For production environments, consider enabling these security features:</p>
 * <pre>
 * saml.security.authnrequest_signed=true
 * saml.security.want_messages_signed=true
 * saml.security.want_assertions_signed=true
 * </pre>
 *

    }

    /**
     * Extracts keywords from the given query string based on the specified fields.
     *
     * @param q the query string to parse and extract keywords from
     * @param fields the fields to consider when extracting keywords
     * @return a list of unique keywords extracted from the query string
     */
    public static List<String> getKeywords(final String q, final String[] fields) {

    /** Executor service for concurrent search operations across multiple searchers */
    protected ExecutorService executorService;

    /** Size of the window for rank fusion processing, determines how many results to consider */
    protected int windowSize;

    /** Set of available searcher names that can be used for search processing */
    protected Set<String> availableSearcherNameSet;

    /**

crawler.ignore.robots.txt=false
# Whether to ignore robots meta tags during crawling.
crawler.ignore.robots.tags=false
# Whether to ignore content exceptions during crawling.
crawler.ignore.content.exception=true
# HTTP status codes considered as failure URLs.
crawler.failure.url.status.codes=404
# Interval (seconds) for system monitor during crawling.
crawler.system.monitor.interval=60
# Whether to ignore idle threads in hot thread monitoring.

     */
    boolean isCrawlerIgnoreContentException();

    /**
     * Get the value for the key 'crawler.failure.url.status.codes'. <br>
     * The value is, e.g. 404 <br>
     * comment: HTTP status codes considered as failure URLs.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerFailureUrlStatusCodes();

    /**