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Validation annotation

As explained in Automating API Delivery

A validation annotation is a declarative annotation that specifies constraints to be checked on input or model data.

A validation annotation declaratively applies input constraints to generated Spring Boot controllers and model objects, allowing the framework to validate requests without handwritten validation logic. section 6.2.1

Rejecting an invalid product ID

A request for /v1/catalog/products/not-a-uuid is rejected with HTTP 400 and an error body containing code validation.client_error, title Bad Request, and a validation detail. A valid UUID returns the product response.

How Automating API Delivery covers it

How deep it goes
Demonstrates framework enforcement and resulting errors, but does not detail annotation types or validation configuration.
Examples
Uses valid and malformed product-ID curl requests to contrast successful output with a standardized HTTP 400 response.
What it assumes
Assumes an OpenAPI-generated Spring Boot service and endpoint familiarity while demonstrating validation behavior without handwritten logic.
What you can do after
Diagnose/debug with it by verifying that generated endpoints reject malformed input and return the defined error schema.
How it connects
Connects OpenAPI code generation, Spring Boot, controller validation, UUID path parameters, and error schemas.
Cover of Automating API Delivery
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Automating API Delivery. The section links point to the parts of the book it draws on.