body: str = ""
    events: list[MessageEvent] = []


class Message(BaseModel):
    input: str
    output: MessageOutput


app = FastAPI(title="Minimal FastAPI App", version="1.0.0")


@app.post("/messages", response_model=Message)
async def create_message(input_message: str) -> Message:
    return Message(
        input=input_message,
        output=MessageOutput(body=f"Processed: {input_message}"),

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

    @Override
    public void log(Level level, String message, Throwable error) {
        requireNonNull(level, "level");
        requireNonNull(message, "message");
        entries.get().add(new Entry(level, message, error));
    }

    @Override
    public List<Entry> drain() {
        return entries.getAndSet(new CopyOnWriteArrayList<>());
    }

/**
 * One or more builds failed.
 *
 */
public class BuildFailureException extends Exception {
    public BuildFailureException(String message) {
        super(message);
    }

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

        this.exception = exception;
        return this;
    }

    public String getMessage() {
        return message;
    }

    public ModelProblemCollectorRequest setMessage(String message) {
        this.message = message;
        return this;
    }

    public InputLocation getLocation() {
        return location;
    }

    private static final long serialVersionUID = -90820222109103638L;

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

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

 *
 */
@Deprecated
public class RepositoryMetadataResolutionException extends Exception {
    public RepositoryMetadataResolutionException(String message) {
        super(message);
    }

    public RepositoryMetadataResolutionException(String message, Exception e) {
        super(message, e);
    }

/**
 * A special throwable used to signal a graceful abort of the build.
 */
public class BuildAbort extends Error {

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

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

     *
     * @param message The detail message, may be {@code null}.
     * @param lifecyclePhase The name of the lifecycle phase that could not be located, may be {@code null}.
     */
    public LifecyclePhaseNotFoundException(String message, String lifecyclePhase) {
        super(message);
        this.lifecyclePhase = (lifecyclePhase != null) ? lifecyclePhase : "";
    }

            }
            builder.endObject();
            return builder;
        }, XContentType.JSON)) {
            message = ((ByteArrayOutputStream) out).toString(Constants.UTF_8);
            if (StringUtil.isBlank(message)) {
                message = "{}";
            }
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**