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Jackson 3 series companion code

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37 runnable examples covering the eight feature posts on ankurm.com, verified
against Jackson 3.2.1 on Temurin 21.0.5. Every output committed under docs/ was
produced by run-all.sh.

Also documents 11 places where the published snippets do not compile or do not
behave as printed against a real Jackson 3 build - most notably that
writeValueAsString(List<Base>) silently drops the polymorphic type discriminator,
so the post's serialised output cannot be read back.
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Ankur
2026-08-04 23:12:11 +05:30
commit c438afc33b
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docs/output/F01SerialiseMixedList.txt Normal file
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--- 1. single element: discriminator present ---
{"paymentType":"credit_card","amountDue":99.99,"cardNetwork":"VISA","cardNumberLastFour":"4242","paymentId":1}
--- 2. BROKEN: writeValueAsString(List) drops paymentType ---
[{"amountDue":99.99,"cardNetwork":"VISA","cardNumberLastFour":"4242","paymentId":1},{"amountDue":250.0,"bankAccountIban":"GB29NWBK60161331926819","bankName":"National Bank","paymentId":2}]
--- 3. FIX A: writerFor(TypeReference) ---
[ {
"paymentType" : "credit_card",
"amountDue" : 99.99,
"cardNetwork" : "VISA",
"cardNumberLastFour" : "4242",
"paymentId" : 1
}, {
"paymentType" : "bank_transfer",
"amountDue" : 250.0,
"bankAccountIban" : "GB29NWBK60161331926819",
"bankName" : "National Bank",
"paymentId" : 2
} ]
--- 4. FIX B: a typed array carries its component type ---
[{"paymentType":"credit_card","amountDue":99.99,"cardNetwork":"VISA","cardNumberLastFour":"4242","paymentId":1},{"paymentType":"bank_transfer","amountDue":250.0,"bankAccountIban":"GB29NWBK60161331926819","bankName":"National Bank","paymentId":2}]