class Item(BaseModel):
    name: str
    price: float


class ResponseMessage(BaseModel):
    message: str


class User(BaseModel):
    username: str
    email: str


@app.post("/items/", response_model=ResponseMessage, tags=["items"])
async def create_item(item: Item):
    return {"message": "Item received"}


@app.get("/items/", response_model=List[Item], tags=["items"])
async def get_items():

```JSON hl_lines="4-16"
{
    "components": {
        "schemas": {
            "Message": {
                "title": "Message",
                "required": [
                    "message"
                ],
                "type": "object",
                "properties": {
                    "message": {
                        "title": "Message",
                        "type": "string"
                    }

    public InvalidQueryException(final VaMessenger<FessMessages> messageCode, final String message, final Throwable cause) {
        super(message, cause);
        this.messageCode = messageCode;
    }

    public InvalidQueryException(final VaMessenger<FessMessages> messageCode, final String message) {
        super(message);
        this.messageCode = messageCode;
    }

    /**
     * @return the messageCode
     */

    public SsoMessageException(final VaMessenger<FessMessages> messageCode, final String message, final Throwable cause) {
        super(message, cause);
        this.messageCode = messageCode;
    }

    public SsoMessageException(final VaMessenger<FessMessages> messageCode, final String message) {
        super(message);
        this.messageCode = messageCode;
    }

    /**
     * @return the messageCode
     */

    public WagonConfigurationException(String repositoryId, String message, Throwable cause) {
        super(repositoryId, message, cause);
    }

    public WagonConfigurationException(String repositoryId, String message) {
        super(repositoryId, message);
    }

@Deprecated
public class LocalRepositoryNotAccessibleException extends IOException {

    public LocalRepositoryNotAccessibleException(String message, Throwable cause) {
        super(message);
        initCause(cause);
    }

    public LocalRepositoryNotAccessibleException(String message) {
        super(message);
    }

    /**
     *
     */
    @Serial
    private static final long serialVersionUID = 7421964724059077698L;

    /**
     * @param message the message of the error
     * @param e {@link Exception}
     */
    public ArtifactDeployerException(String message, Exception e) {
        super(message, e);
    }

    @Serial
    private static final long serialVersionUID = 1504740189114877333L;

    /**
     * @param message the message to give
     * @param e the {@link Exception}
     */
    public VersionParserException(String message, Exception e) {
        super(message, e);
    }

    public CrawlerSystemException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public CrawlerSystemException(final String message) {
        super(message);
    }

    public CrawlerSystemException(final Throwable cause) {
        super(cause);
    }

    protected CrawlerSystemException(final String message, final boolean enableSuppression, final boolean writableStackTrace) {

    /**
     * Creates a new exception with specified details.
     *
     * @param message The message text, may be {@code null}.
     * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
     */
    public DuplicateProjectException(String message, Map<String, List<File>> collisions) {
        super(message, (File) null);