p.client.Transport = http.DefaultTransport
	}

	if p.oeConfig.TokenEndpoint == "" {
		return nil, errors.New("missing OpenID token endpoint")
	}

	if p.realm == "" {
		p.realm = "master" // default realm
	}

	return p, nil

import org.lastaflute.web.validation.VaMessenger;

import jakarta.annotation.Resource;

/**
 * Admin action for User management.
 *
 */
public class AdminUserAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminUserAction() {
        super();
    }

    /** Role name for admin user operations */
    public static final String ROLE = "admin-user";

import jakarta.annotation.Resource;

/**
 * Admin action for Web Authentication management.
 *
 */
public class AdminWebauthAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminWebauthAction() {
        super();
    }

    /** Role name for admin web auth operations */
    public static final String ROLE = "admin-webauth";

                throw new CrawlerSystemException("Test exception");
            }

            if (returnedResultData != null) {
                return returnedResultData;
            }

            // Create default ResultData
            ResultData resultData = new ResultData();
            resultData.setTransformerName(getName());
            return resultData;
        }

        @Override

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
import org.codelibs.core.collection.CollectionsUtil;
import java.util.SequencedCollection;

import jakarta.annotation.Resource;

/**
 * Admin action for Request Header management.
 *
 */
public class AdminReqheaderAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminReqheaderAction() {
        super();
    }

    /** Role name for admin request header operations */
    public static final String ROLE = "admin-reqheader";

    /** Base directory for command execution. */
    protected File baseDir;

    /** Timer for managing process destruction. */
    private Timer destoryTimer;

    /**
     * Default constructor for CommandGenerator.
     */
    public CommandGenerator() {
        super();
    }

    /**
     * Initializes the command generator after construction.
     */
    @PostConstruct

     * during artifact resolution, {@link #VALIDATION_LEVEL_MINIMAL} should be used to account for models of poor
     * quality. By default, models are validated in strict mode.
     *
     * @param validationLevel The level of validation to perform on processed models.
     * @return This request, never {@code null}.
     */

        try {
            MavenSession clone = (MavenSession) super.clone();
            // the default must become the current project of the thread that clones this
            MavenProject current = getCurrentProject();
            // we replace the thread local of the clone to prevent write through and enforce the new default value
            clone.currentProject = ThreadLocal.withInitial(() -> current);
            return clone;

    /**
     * Hash size for splitting thumbnail storage directories.
     */
    protected int splitHashSize = 10;

    /**
     * Default constructor for ThumbnailManager.
     */
    public ThumbnailManager() {
        // Default constructor
    }

    /**
     * Initializes the thumbnail manager after construction.
     * Sets up base directory and starts background processing.
     */