We could do better.

We can declare a `UserBase` model that serves as a base for our other models. And then we can make subclasses of that model that inherit its attributes (type declarations, validation, etc).

All the data conversion, validation, documentation, etc. will still work as normally.

That way, we can declare just the differences between the models (with plaintext `password`, with `hashed_password` and without password):

        copyBeanToBean(entity, body, copyOp -> {
            copyOp.excludeNull();
        });
        return body;
    }

    /**
     * Validates whether a file configuration ID exists.
     *
     * @param fileconfigId the file configuration ID to validate
     * @return true if the file configuration exists, false otherwise
     */
    protected Boolean isValidFileConfigId(final String fileconfigId) {

   * silently converted to "\n" when the XML is parsed.
   *
   * <p>This escaper does not treat surrogate pairs specially and does not perform Unicode
   * validation on its input.
   */
  public static Escaper xmlContentEscaper() {
    return XML_CONTENT_ESCAPER;
  }

  /**
   * Returns an {@link Escaper} instance that escapes special characters in a string so it can

    public static final String MAVEN_RESOLVER_TRANSPORT = "maven.resolver.transport";

    /**
     * Plugin validation level.
     *
     * @since 3.9.2
     */
    @Config(defaultValue = "inline")
    public static final String MAVEN_PLUGIN_VALIDATION = "maven.plugin.validation";

    /**
     * Plugin validation exclusions.
     *
     * @since 3.9.6
     */
    @Config

 */
package jcifs.internal.smb2.ioctl;

import jcifs.Decodable;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Validate Negotiate Info response data structure. This structure contains the server's
 * validation of the originally negotiated SMB2 dialect.
 *
 * @author mbechler
 *
 */
public class ValidateNegotiateInfoResponse implements Decodable {

    /**

     * @return The HTML response.
     */
    @Execute
    public HtmlResponse advance(final SearchForm form) {
        if (isLoginRequired()) {
            return redirectToLogin();
        }
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_IndexJsp)).renderWith(data -> {
            buildInitParams();
            RenderDataUtil.register(data, "notification", fessConfig.getNotificationSearchTop());
        }));

<img src="https://fastapi.tiangolo.com/img/tutorial/body-fields/image01.png">

## 技術詳細

`example` と `examples`について...

JSON Schemaの最新バージョンでは<a href="https://json-schema.org/draft/2019-09/json-schema-validation.html#rfc.section.9.5" class="external-link" target="_blank">`examples`</a>というフィールドを定義していますが、OpenAPIは`examples`を持たない古いバージョンのJSON Schemaをベースにしています。

import org.apache.maven.api.cli.extensions.CoreExtension;

import static java.util.Objects.requireNonNull;

/**
 * Represents the list of core extensions configured at one source. The list is validated (are GA unique), but no
 * other logic than that is applied.
 *
 * @since 4.0.0
 * @param source The source file of core extensions, is never {@code null}.

     * @return ActionResponse containing the cached document content or error redirect
     */
    @Execute
    public ActionResponse index(final CacheForm form) {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {

import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test

/**
 * Jetty HTTP client.
 *
 * https://www.eclipse.org/jetty/documentation/current/http-client.html
 *
 * Baseline test if we ned to validate OkHttp behaviour against other popular clients.
 */
class JettyHttpClientTest {
  private val client = HttpClient()

  @StartStop
  private val server = MockWebServer()

  @BeforeEach fun setUp() {