super();
    }

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    /** Service for managing job log data */
    @Resource
    private JobLogService jobLogService;

    private static final String INVALID_OLD_PASSWORD = "LoginAction.invalidOldPassword";

    // ===================================================================================
    // Attribute
    //
    @Resource
    private UserService userService;

    // ===================================================================================

 *
 */
public class UserInfoHelper {

    /**
     * Default constructor for UserInfoHelper.
     */
    public UserInfoHelper() {
        // Default constructor
    }

    /** The session attribute key for storing user bean information */
    protected static final String USER_BEAN = "lastaflute.action.USER_BEAN.FessUserBean";

    /** The maximum size of the result document IDs cache */

    //

    // ===================================================================================
    //                                                                           Attribute
    //

    // ===================================================================================
    //                                                                               Hook

Now use the parameter `callbacks` in *your API's path operation decorator* to pass the attribute `.routes` (that's actually just a `list` of routes/*path operations*) from that callback router:

{* ../../docs_src/openapi_callbacks/tutorial001.py hl[35] *}

/// tip

Notice that you are not passing the router itself (`invoices_callback_router`) to `callback=`, but the attribute `.routes`, as in `invoices_callback_router.routes`.

///

You can reuse FastAPI's internal functions to create the HTML pages for the docs, and pass them the needed arguments:

* `openapi_url`: the URL where the HTML page for the docs can get the OpenAPI schema for your API. You can use here the attribute `app.openapi_url`.
* `title`: the title of your API.
* `oauth2_redirect_url`: you can use `app.swagger_ui_oauth2_redirect_url` here to use the default.

    protected PathMappingHelper pathMappingHelper;

    // ===================================================================================
    //                                                                           Attribute
    //

    // ===================================================================================
    //                                                                               Hook

///

## Mehrere Body-Parameter

Im vorherigen Beispiel erwartete die *Pfadoperation* einen JSON-Body mit den Attributen eines `Item`s, etwa:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

        super();
    }

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    /** System properties for dynamic configuration management */
    @Resource
    protected DynamicProperties systemProperties;

    // ===================================================================================
    //                                                                           Attribute
    //

    // ===================================================================================
    //                                                                               Hook