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Add crud-mysql module: Spring Boot 4.1 CRUD API on a real MySQL 8.4.6 with JPA, Flyway, validation and ProblemDetail errors

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HhW8LD8r3EigoBaCGrQZx5

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HhW8LD8r3EigoBaCGrQZx5
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Claude
2026-10-21 16:43:45 +00:00
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| [`rest-test-client/`](rest-test-client) | [RestTestClient in Spring Framework 7: Testing REST APIs End-to-End (vs MockMvcTester)](https://ankurm.com/resttestclient-spring-framework-7-end-to-end-testing/) | one fluent `RestTestClient` API proven across `bindToController`, `bindTo(mockMvc)`, `bindToApplicationContext` and `bindToServer`; `RestTestClient`, `TestRestTemplate` and `@WebMvcTest` confirmed relocated into new Spring Boot 4 modules by unzipping the real jars; two distinct real failures for the two now-separate `@AutoConfigureRestTestClient`/`@AutoConfigureTestRestTemplate` annotations; and the JDK `HttpClient` Boot picks for `bindToServer` caught transparently decoding gzip and hiding `Content-Encoding`, verified against `curl` and against the older `SimpleClientHttpRequestFactory` |
| [`file-transfer/`](file-transfer) | [File Upload and Download in Spring Boot 4: Multipart, Streaming and S3 Presigned URLs](https://ankurm.com/file-upload-download-spring-boot-4-multipart-streaming-s3-presigned-urls/) | multipart limits enforced by Tomcat (and ignored by `MockMvc`), the client-controlled filename, `Range` downloads, a 200 MB download and 150 MB upload under `-Xmx64m`, and S3 presigned URLs checked against a local SigV4 verifier (not a real S3) |
| [`project-structure/`](project-structure) | [Spring Boot Project Structure: Package-by-Layer vs Package-by-Feature](https://ankurm.com/spring-boot-project-structure/) | the same application written package-by-layer and package-by-feature with one HTTP API, the real source trees, 9 of 9 types public by layer vs 3 of 15 by feature, and the `javac` error that makes a feature boundary a compiler rule instead of a convention |
| [`crud-mysql/`](crud-mysql) | [Spring Boot CRUD REST API with MySQL and Spring Data JPA](https://ankurm.com/spring-boot-crud-rest-api-mysql/) | a complete book API on a real MySQL 8.4.6 server with Flyway owning the schema and Hibernate set to `validate`, `ProblemDetail` errors with per-field validation messages, a duplicate ISBN caught by the database's unique key and mapped to `409` on create and on update, MySQL's own `Duplicate entry` message, and the SQL behind every request |
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n`, `aot-cache`, `kotlin`, `testing-no-containers`, `rest-test-client` and `hexagonal` are the exception: they have **no `docs/NN-topic.md` chapter folder**. Their deeper material lives in
collapsible sections inside the articles themselves. Where their captured output sits is not