asmhatre/jackson2-to-3-migration
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Jackson 2 to 3 migration companion code

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Three Maven modules - jackson2-before (2.22.1), jackson3-after (3.2.1) and a
coexistence module with BOTH majors on one classpath - so every claim in the two
migration guides is executed rather than asserted. Paired class names make the
before/after outputs directly diffable via run-all.sh.

Confirms the guides on wire-format equivalence (10-case suite, zero mismatches),
classpath coexistence and the collapse of four artifacts into one. Corrects nine
points, including that enableDefaultTyping() is still present in Jackson 2.22.1
rather than removed in 2.16, and that the published "after" mapper snippet does
not compile.
This commit is contained in:
Ankur
2026-08-04 23:12:25 +05:30
commit f0a7053fc9
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12
docs/output/coexistence-S06BothOnOneClasspath.txt Normal file
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jackson 2 class : com.fasterxml.jackson.databind.ObjectMapper
jackson 3 class : tools.jackson.databind.json.JsonMapper
jackson 2 output: {"booking_id":1,"travel_date":"2026-09-15"}
jackson 3 output: {"booking_id":1,"travel_date":"2026-09-15"}
wire-compatible : true
3 reads 2's JSON: Booking[id=1, travelDate=2026-09-15]
2 reads 3's JSON: Booking[id=1, travelDate=2026-09-15]
annotation from : jackson-annotations-2.22.jar
<- one jackson-annotations jar, used by both majors