Integer nullValue = IntegerConversionUtil.toInteger(null);     // Returns null
Boolean flag = BooleanConversionUtil.toBoolean("true");        // Returns true
Date date = DateConversionUtil.toDate("2023-12-25", "yyyy-MM-dd");

// Primitive conversions with default values
int primitiveInt = IntegerConversionUtil.toPrimitiveInt(value, "0");  // Default to 0 if null
```

### Collection Utilities with Java 21 Support
```java

 * <td>{@link DateFormat#SHORT} format</td>
 * <td>{@literal yy/MM/dd}</td>
 * </tr>
 * <tr>
 * <td>{@link DateFormat#MEDIUM} format</td>
 * <td>{@literal yyyy/MM/dd}</td>
 * </tr>
 * <tr>
 * <td>{@link DateFormat#LONG} format</td>
 * <td>{@literal yyyy/MM/dd}</td>
 * </tr>
 * <tr>
 * <td>{@link DateFormat#FULL} format</td>
 * <td>{@literal yyyy'nen'M'gatsu'd'nichi'}</td>
 * </tr>
 * <tr>

     * Maximum length is 10000 characters.
     */
    @Size(max = 10000)
    public String parameterName;

    /**
     * The expiration date and time for the access token.
     * Must be in ISO 8601 format: YYYY-MM-DDTHH:MM:SS
     */
    @Pattern(regexp = "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]:[0-9][0-9]:[0-9][0-9]")
    public String expires;

    /**
     * The username of the user who created this access token.

    public String queryId;

    /** User session ID filter for search logs. */
    public String userSessionId;

    /** Time range filter for search logs (format: "yyyy-MM-dd HH:mm - yyyy-MM-dd HH:mm"). */
    public String requestedTimeRange;

    /** Access type filter for search logs (web, json, gsa, admin, other). */
    public String accessType;

    /**

 * </tr>
 * <tr>
 * <td>{@link DateFormat#MEDIUM} format</td>
 * <td>{@literal yyyy/MM/dd H:mm:ss}</td>
 * </tr>
 * <tr>
 * <td>{@link DateFormat#LONG} format</td>
 * <td>{@literal yyyy/MM/dd H:mm:ss z}</td>
 * </tr>
 * <tr>
 * <td>{@link DateFormat#FULL} format</td>
 * <td>{@literal yyyy'年'M'月'd'日' H'時'mm'分'ss'秒' z}</td>
 * </tr>
 * </table>
 *
 * @author shinsuke
 * @see DateConversionUtil

    /**
     * The ndjson extension.
     */
    public static final String NDJSON_EXTENTION = ".ndjson";

    private static final DateTimeFormatter ISO_8601_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");

    @Resource
    private AsyncManager asyncManager;

    @Resource
    private WebConfigBhv webConfigBhv;

    @Resource
    private FileConfigBhv fileConfigBhv;

    /** Default datetime format pattern without timezone. */
    public static final String DEFAULT_DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss";

    /** ISO datetime format pattern with milliseconds and UTC timezone. */
    public static final String ISO_DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /** Date optional time format identifier. */

    /**
     * Build timestamp format.
     *
     * @since 3.0.0
     */
    @Config(source = Config.Source.MODEL, defaultValue = "yyyy-MM-dd'T'HH:mm:ssXXX")
    public static final String MAVEN_BUILD_TIMESTAMP_FORMAT = "maven.build.timestamp.format";

    /**
     * User controlled relocations.

 * analytics and reporting purposes.
 */
public class SearchLogService {

    /** Date format pattern for parsing time ranges. */
    private static final String YYYY_MM_DD_HH_MM = "yyyy-MM-dd HH:mm";

    /** Field name for count values in aggregation results. */
    private static final String COUNT = "count";

    /** Field name for key values in aggregation results. */

    val lastModifiedDate = Date(System.currentTimeMillis() + TimeUnit.HOURS.toMillis(-1))
    val servedDate = Date(System.currentTimeMillis() + TimeUnit.HOURS.toMillis(-2))
    val dateFormat: DateFormat = SimpleDateFormat("EEE dd-MMM-yyyy HH:mm:ss z", Locale.US)
    dateFormat.timeZone = TimeZone.getTimeZone("America/New_York")
    val lastModifiedString = dateFormat.format(lastModifiedDate)
    val servedString = dateFormat.format(servedDate)