Add i18n module: MessageSource, LocaleResolver and localized ProblemDetail

English, Marathi and Hindi bundles behind one small web app, with tests that run it on a real port and write the transcripts (01-11) quoted in the article, plus a jar-metadata capture (12). Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
2026-09-24 09:54:55 +00:00
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+# Three kinds of exception: an ErrorResponse, an ordinary exception handled through the MessageSource, and one handled with English text in the source
+
+
+--- an ErrorResponse (OrderNotFoundException) ---
+Accept-Language: en
+status=404  Content-Type=application/problem+json
+title:  Order not found
+detail: No order with id 7 exists.
+Accept-Language: mr
+status=404  Content-Type=application/problem+json
+title:  ऑर्डर सापडली नाही
+detail: ७ क्रमांकाची ऑर्डर अस्तित्वात नाही.
+Accept-Language: hi
+status=404  Content-Type=application/problem+json
+title:  ऑर्डर नहीं मिला
+detail: क्रमांक 7 वाला ऑर्डर मौजूद नहीं है।
+
+--- an ordinary exception, translated in the handler (PaymentDeclinedException) ---
+Accept-Language: en
+status=402  Content-Type=application/problem+json
+title:  Payment declined
+detail: Payment of 499.00 was declined.
+Accept-Language: mr
+status=402  Content-Type=application/problem+json
+title:  पेमेंट नाकारले
+detail: 499.00 चे पेमेंट नाकारले गेले.
+Accept-Language: hi
+status=402  Content-Type=application/problem+json
+title:  भुगतान अस्वीकृत
+detail: 499.00 का भुगतान अस्वीकार कर दिया गया।
+
+--- an ordinary exception, English in the handler (LegacyStateException) ---
+Accept-Language: en
+status=409  Content-Type=application/problem+json
+title:  Conflict
+detail: The order is in a state that does not allow this.
+Accept-Language: mr
+status=409  Content-Type=application/problem+json
+title:  Conflict
+detail: The order is in a state that does not allow this.
+Accept-Language: hi
+status=409  Content-Type=application/problem+json
+title:  Conflict
+detail: The order is in a state that does not allow this.