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Add library-management module: console app evolved into a Spring Boot 4 REST API

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Stage 2 console classes and the shared LoanPolicy, then a Spring Boot 4.1.2 + JPA API
(H2, @Version optimistic locking, problem+json errors). Tests write output/ transcripts
while asserting the same numbers; scripts regenerate everything.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4DPL6dtpFg4U4LHc2
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Claude
2026-11-14 21:21:16 +05:30
parent b9aeb78b24
commit 26ece9cc9b
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library-management/output/03-rest-api.txt
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> POST /api/books {"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","copies":2}
< 201 {"id":1,"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","totalCopies":2,"availableCopies":2}
> POST /api/books {"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","copies":2}
< 409 {"detail":"ISBN 978-0134685991 already exists","instance":"/api/books","status":409,"title":"Conflict"}
> POST /api/books {"isbn":"978-0000000000","title":"","author":"Nobody","copies":0}
< 400 {"detail":"request body failed validation","instance":"/api/books","status":400,"title":"Bad Request","errors":{"copies":"must be greater than or equal to 1","title":"must not be blank"}}
> POST /api/books {"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","copies":1}
< 201 {"id":2,"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","totalCopies":1,"availableCopies":1}
> POST /api/books {"isbn":"978-0132350884","title":"Clean Code","author":"Robert Martin","copies":1}
< 201 {"id":3,"isbn":"978-0132350884","title":"Clean Code","author":"Robert Martin","totalCopies":1,"availableCopies":1}
> POST /api/books {"isbn":"978-0321356680","title":"Effective Java 2e","author":"Joshua Bloch","copies":1}
< 201 {"id":4,"isbn":"978-0321356680","title":"Effective Java 2e","author":"Joshua Bloch","totalCopies":1,"availableCopies":1}
> POST /api/members {"name":"Asha","email":"[email protected]"}
< 201 {"id":1,"name":"Asha","email":"[email protected]"}
> POST /api/members {"name":"Ravi","email":"[email protected]"}
< 201 {"id":2,"name":"Ravi","email":"[email protected]"}
> POST /api/loans {"memberId":1,"bookId":2}
< 201 {"id":1,"bookTitle":"Head First Java","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0}
> POST /api/loans {"memberId":2,"bookId":2}
< 409 {"detail":"no copies of 'Head First Java' are available","instance":"/api/loans","status":409,"title":"Conflict"}
> POST /api/loans {"memberId":99,"bookId":1}
< 404 {"detail":"no member with id 99","instance":"/api/loans","status":404,"title":"Not Found"}
> POST /api/loans/1/return {"returnedOn":"2026-11-20"}
< 200 {"id":1,"bookTitle":"Head First Java","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":"2026-11-20","fine":10}
> POST /api/loans/1/return {"returnedOn":"2026-11-21"}
< 409 {"detail":"loan 1 was already returned on 2026-11-20","instance":"/api/loans/1/return","status":409,"title":"Conflict"}
> POST /api/loans {"memberId":1,"bookId":1}
< 201 {"id":2,"bookTitle":"Effective Java","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0}
> POST /api/loans {"memberId":1,"bookId":3}
< 201 {"id":3,"bookTitle":"Clean Code","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0}
> POST /api/loans {"memberId":1,"bookId":4}
< 201 {"id":4,"bookTitle":"Effective Java 2e","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0}
> POST /api/loans {"memberId":1,"bookId":2}
< 422 {"detail":"Asha already has 3 active loans (max 3)","instance":"/api/loans","status":422,"title":"Unprocessable Content"}
> GET /api/books
< 200 [{"id":1,"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","totalCopies":2,"availableCopies":1},{"id":2,"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","totalCopies":1,"availableCopies":1},{"id":3,"isbn":"978-0132350884","title":"Clean Code","author":"Robert Martin","totalCopies":1,"availableCopies":0},{"id":4,"isbn":"978-0321356680","title":"Effective Java 2e","author":"Joshua Bloch","totalCopies":1,"availableCopies":0}]
> GET /api/loans
< 200 [{"id":1,"bookTitle":"Head First Java","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":"2026-11-20","fine":10},{"id":2,"bookTitle":"Effective Java","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0},{"id":3,"bookTitle":"Clean Code","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0},{"id":4,"bookTitle":"Effective Java 2e","memberName":"Asha","borrowedOn":"2026-11-01","dueOn":"2026-11-15","returnedOn":null,"fine":0}]