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

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
2026-10-21 16:43:45 +00:00
parent ba709737de
commit 2996628ff1
27 changed files with 968 additions and 0 deletions
@@ -0,0 +1,45 @@
+# What the client sees when something is wrong
+
+
+--- validation: three fields wrong at once ---
+$ curl -i -X POST 'localhost:8080/api/books' -H 'Content-Type: application/json' -d '{"title":"","author":"Someone","isbn":"123","price":-1}'
+HTTP 400
+{"detail":"Invalid request content.","instance":"/api/books","status":400,"title":"Bad Request","errors":{"isbn":"must be 13 digits starting with 978 or 979","price":"must be greater than or equal to 0.00","title":"must not be blank"}}
+
+
+--- duplicate ISBN on create ---
+$ curl -i -X POST 'localhost:8080/api/books' -H 'Content-Type: application/json' -d '{"title":"Java Concurrency in Practice","author":"Brian Goetz","isbn":"9780321349606","price":39.99}'
+HTTP 409
+{"detail":"A book with that ISBN already exists","instance":"/api/books","status":409,"title":"Conflict"}
+
+
+--- duplicate ISBN on update (book 2 takes book 1's ISBN) ---
+$ curl -i -X PUT 'localhost:8080/api/books/2' -H 'Content-Type: application/json' -d '{"title":"Java Concurrency in Practice","author":"Brian Goetz","isbn":"9780134685991","price":39.99}'
+HTTP 409
+{"detail":"A book with that ISBN already exists","instance":"/api/books/2","status":409,"title":"Conflict"}
+
+
+--- the message MySQL itself produced for the duplicate ---
+Duplicate entry '9780134685991' for key 'book.uk_book_isbn'
+
+--- unknown id ---
+$ curl -i -X GET 'localhost:8080/api/books/99'
+HTTP 404
+{"detail":"Book 99 not found","instance":"/api/books/99","status":404,"title":"Not Found"}
+
+$ curl -i -X DELETE 'localhost:8080/api/books/99'
+HTTP 404
+{"detail":"Book 99 not found","instance":"/api/books/99","status":404,"title":"Not Found"}
+
+
+--- the id is not a number ---
+$ curl -i -X GET 'localhost:8080/api/books/abc'
+HTTP 400
+{"detail":"Failed to convert 'id' with value: 'abc'","instance":"/api/books/abc","status":400,"title":"Bad Request"}
+
+
+--- the body is not JSON ---
+$ curl -i -X POST 'localhost:8080/api/books' -H 'Content-Type: application/json' -d '{not json'
+HTTP 400
+{"detail":"Failed to read request","instance":"/api/books","status":400,"title":"Bad Request"}
+