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