By default, what the method `.openapi()` does is check the property `.openapi_schema` to see if it has contents and return them.

If it doesn't, it generates them using the utility function at `fastapi.openapi.utils.get_openapi`.

And that function `get_openapi()` receives as parameters:

* `title`: The OpenAPI title, shown in the docs.
* `version`: The version of your API, e.g. `2.5.0`.

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.util;

/**
 * Utility class for character-related operations.
 */
public final class CharUtil {
    /**
     * Private constructor to prevent instantiation of this utility class.
     */
    private CharUtil() {
    }

    /**
     * Checks if the given character is a valid URL character.
     *

import org.codelibs.fess.crawler.entity.ResponseData;
import org.codelibs.fess.crawler.exception.CrawlingAccessException;

/**
 * Utility class for handling response data.
 */
public final class ResponseDataUtil {

    /**
     * Private constructor to prevent instantiation of this utility class.
     */
    private ResponseDataUtil() {
    }

    /**

import org.codelibs.fess.Constants;

/**
 * Utility class for generating and writing thread dumps.
 * Provides methods to capture thread information for debugging purposes.
 */
public class ThreadDumpUtil {
    private static final Logger logger = LogManager.getLogger(ThreadDumpUtil.class);

    /**
     * Private constructor to prevent instantiation of this utility class.
     */
    protected ThreadDumpUtil() {

import java.net.Inet6Address;
import java.net.InetAddress;

/**
 * Utility class for handling IP addresses, particularly IPv6 addresses in URLs.
 * This class provides methods to properly format IPv6 addresses for use in URLs
 * by adding brackets where necessary.
 */
public final class IpAddressUtil {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private IpAddressUtil() {

        validationMessagesLambda.message(messages);
        sessionManager.errors().saveMessages(messages);
    }

    /**
     * Copies properties from source bean to destination bean.
     * This is a utility method that wraps BeanUtil.copyBeanToBean with custom options.
     *
     * @param src the source bean object
     * @param dest the destination bean object
     * @param option a consumer function to configure copy options

import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * Utility class for creating test fixtures and reducing code duplication in tests.
 */
public final class TestUtils {

    private TestUtils() {
        // Utility class
    }

    /**
     * Creates a mock UpgradeContext with default settings.
     *
     * @return a mock UpgradeContext

import static eu.maveniverse.domtrip.maven.MavenPomElements.Elements.PLUGIN;
import static eu.maveniverse.domtrip.maven.MavenPomElements.Elements.VERSION;

/**
 * Utility class for XML operations on Maven POM files.
 *
 * <p>This class provides convenience methods that delegate to:
 * <ul>
 * <li>{@link eu.maveniverse.domtrip.maven.PomEditor} - DomTrip's PomEditor</li>

 */
package org.codelibs.core.misc;

import java.util.Base64;

import org.codelibs.core.collection.ArrayUtil;
import org.codelibs.core.lang.StringUtil;

/**
 * Utility class for handling Base64 encoding and decoding.
 * <p>
 * This class now uses the standard {@link java.util.Base64} implementation
 * instead of a custom implementation, providing better security and performance.

/**
 * Utility class for handling Maven model version operations during upgrades.
 *
 * <p>This class uses domtrip internally for superior formatting preservation
 * and simplified API while maintaining the same external interface.
 */
public final class ModelVersionUtils {

    private ModelVersionUtils() {
        // Utility class
    }

    /**