private volatile boolean set;
        private volatile Model model;

        Holder() {}

        Holder(Model model) {
            this.model = Objects.requireNonNull(model);
            this.set = true;
        }

        public static Model deref(Holder holder) {
            return holder != null ? holder.get() : null;
        }

        public Model get() {
            if (!set) {

                                "application/json": {
                                    "schema": {
                                        "title": "Response Response Model List Of Model No Annotation Response Model List Of Model No Annotation Get",
                                        "type": "array",
                                        "items": {"$ref": "#/components/schemas/User"},
                                    }

The same way, this database wouldn't receive a Pydantic model (an object with attributes), only a `dict`.

You can use `jsonable_encoder` for that.

It receives an object, like a Pydantic model, and returns a JSON compatible version:

{* ../../docs_src/encoder/tutorial001_py310.py hl[4,21] *}

In this example, it would convert the Pydantic model to a `dict`, and the `datetime` to a `str`.

            final Map<String, Object> requestBody = new HashMap<>(updateMap);
            final String idKey = getIdKey();

            requestBody.put("version", 1);
            requestBody.put("crud_mode", 2);

            if (setting.containsKey(idKey)) {
                requestBody.put(idKey, setting.get(idKey));
            }

            final Map<String, Object> doc = new HashMap<>();

    # "We were unable to automatically build your code", modify the matrix above
    # to set the build mode to "manual" for that language. Then modify this step
    # to build your code.
    # ℹ️ Command-line programs to run using the OS shell.
    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
    - if: matrix.build-mode == 'manual'
      shell: bash
      run: |

import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.maven.model.Activation;
import org.apache.maven.model.Profile;
import org.apache.maven.model.building.ModelProblem;
import org.apache.maven.model.profile.DefaultProfileActivationContext;
import org.apache.maven.model.profile.ProfileSelector;
import org.apache.maven.profiles.activation.ProfileActivationException;

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.inheritance;

import org.apache.maven.api.model.Model;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblemCollector;

/**
 * Handles inheritance of model values.
 *
 * @deprecated use {@link org.apache.maven.api.services.ModelBuilder} instead
 */

 */
package org.apache.maven.project.inheritance.t02;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.model.Build;
import org.apache.maven.model.Plugin;
import org.apache.maven.model.PluginExecution;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.inheritance.AbstractProjectInheritanceTestCase;
import org.junit.jupiter.api.Test;

  <packaging>pom</packaging>

  <name>Maven Compatibility Modules</name>

  <modules>
    <module>maven-plugin-api</module>
    <module>maven-builder-support</module>
    <module>maven-model</module>
    <module>maven-model-builder</module>
    <module>maven-settings</module>
    <module>maven-settings-builder</module>
    <module>maven-artifact</module>
    <module>maven-resolver-provider</module>

    }

    /**
     * Gets the group id of the unresolvable model.
     *
     * @return The group id of the unresolvable model, can be empty but never {@code null}.
     */
    public String getGroupId() {
        return groupId;
    }

    /**
     * Gets the artifact id of the unresolvable model.
     *
     * @return The artifact id of the unresolvable model, can be empty but never {@code null}.
     */