asmhatre/jackson3-by-example
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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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4
docs/output/H05NeverDeserialiseIntoObject.txt Normal file
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as Object : {action=ship, quantity=3, extra={nested=[1, 2]}}
runtime type: java.util.LinkedHashMap <- a plain Map, no arbitrary class was instantiated
as DTO : MyRequestDto[action=ship, quantity=3]
bad input : rejected with InvalidFormatException