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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
38 changed files with 1444 additions and 0 deletions
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library-management/output/07-curl-demo.txt
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> POST /books {"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","copies":2}
{"id":1,"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","totalCopies":2,"availableCopies":2}
< HTTP 201
> POST /books {"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","copies":1}
{"id":2,"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","totalCopies":1,"availableCopies":1}
< HTTP 201
> POST /books {"isbn":"","title":"","author":"Nobody","copies":0}
{"detail":"request body failed validation","instance":"/api/books","status":400,"title":"Bad Request","errors":{"copies":"must be greater than or equal to 1","isbn":"must not be blank","title":"must not be blank"}}
< HTTP 400
> POST /members {"name":"Asha","email":"[email protected]"}
{"id":1,"name":"Asha","email":"[email protected]"}
< HTTP 201
> POST /members {"name":"Ravi","email":"not-an-email"}
{"detail":"request body failed validation","instance":"/api/members","status":400,"title":"Bad Request","errors":{"email":"must be a well-formed email address"}}
< HTTP 400
> POST /members {"name":"Ravi","email":"[email protected]"}
{"id":2,"name":"Ravi","email":"[email protected]"}
< HTTP 201
> POST /loans {"memberId":1,"bookId":2}
{"id":1,"bookTitle":"Head First Java","memberName":"Asha","borrowedOn":"2026-11-14","dueOn":"2026-11-28","returnedOn":null,"fine":0}
< HTTP 201
> POST /loans {"memberId":2,"bookId":2}
{"detail":"no copies of 'Head First Java' are available","instance":"/api/loans","status":409,"title":"Conflict"}
< HTTP 409
> POST /loans/1/return
{"id":1,"bookTitle":"Head First Java","memberName":"Asha","borrowedOn":"2026-11-14","dueOn":"2026-11-28","returnedOn":"2026-11-14","fine":0}
< HTTP 200
> GET /books
[{"id":1,"isbn":"978-0134685991","title":"Effective Java","author":"Joshua Bloch","totalCopies":2,"availableCopies":2},{"id":2,"isbn":"978-0596009205","title":"Head First Java","author":"Kathy Sierra","totalCopies":1,"availableCopies":1}]
< HTTP 200