}

    /**
     * Class definition
     */
    private final boolean errors;

    private final T value;

    private final Iterable<? extends ModelProblem> problems;

    private Result(boolean errors, T model, Iterable<? extends ModelProblem> problems) {
        this.errors = errors;
        this.value = model;
        this.problems = problems;
    }

            try:
                return await original_route_handler(request)
            except RequestValidationError as exc:
                body = await request.body()
                detail = {"errors": exc.errors(), "body": body.decode()}
                raise HTTPException(status_code=422, detail=detail)

        return custom_route_handler


app = FastAPI()
app.router.route_class = ValidationErrorLoggingRoute

            try:
                return await original_route_handler(request)
            except RequestValidationError as exc:
                body = await request.body()
                detail = {"errors": exc.errors(), "body": body.decode()}
                raise HTTPException(status_code=422, detail=detail)

        return custom_route_handler


app = FastAPI()
app.router.route_class = ValidationErrorLoggingRoute

 */
package org.codelibs.fess.exception;

/**
 * System exception class for the Fess search engine.
 * This exception is thrown when system-level errors occur in the Fess application,
 * such as configuration errors, initialization failures, or critical runtime issues.
 */
public class FessSystemException extends RuntimeException {

    /** Serial version UID for serialization compatibility */

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc: RequestValidationError):
    message = "Validation errors:"
    for error in exc.errors():
        message += f"\nField: {error['loc']}, Error: {error['msg']}"
    return PlainTextResponse(message, status_code=400)


@app.get("/items/{item_id}")
async def read_item(item_id: int):

        final List<Throwable> errors = new ArrayList<>(elevateWords.length);
        for (final ElevateWord elevateWord : elevateWords) {
            final SuggestIndexResponse res = addElevateWord(elevateWord, true);
            numberOfSuggestDocs += res.getNumberOfSuggestDocs();
            numberOfInputDocs += res.getNumberOfInputDocs();
            errors.addAll(res.getErrors());
        }

 */

package jcifs.dcerpc;

import jcifs.CIFSException;
import jcifs.smb.WinError;
import jcifs.util.Hexdump;

/**
 * Exception class for DCE/RPC related errors.
 * This exception is thrown when DCE/RPC protocol errors occur.
 */
public class DcerpcException extends CIFSException implements DcerpcError, WinError {

    /**
     *
     */

    return JSONResponse(
        status_code=422,
        content={"detail": jsonable_encoder(exc.errors())},
    )


async def websocket_request_validation_exception_handler(
    websocket: WebSocket, exc: WebSocketRequestValidationError
) -> None:
    await websocket.close(
        code=WS_1008_POLICY_VIOLATION, reason=jsonable_encoder(exc.errors())

<img src="/img/tutorial/generate-clients/image08.png">

## Benefits { #benefits }

When using the automatically generated clients, you would get **autocompletion** for:

* Methods.
* Request payloads in the body, query parameters, etc.
* Response payloads.

You would also have **inline errors** for everything.

            return robotsTxt;
        } catch (final java.io.IOException e) {
            // Only throw exception for fatal I/O errors
            throw new RobotsTxtException("Failed to read robots.txt due to I/O error.", e);
        } catch (final Exception e) {
            // Catch any other fatal errors (e.g., encoding issues)
            throw new RobotsTxtException("Failed to parse robots.txt.", e);
        }
    }

    /**