{"activities-steps":[
{"dateTime":"2018-04-17","value":"11045"},
{"dateTime":"2018-04-18","value":"14324"},
{"dateTime":"2018-05-16","value":"11596"}
]}

data class ActivitiesSteps(var dateTime: String, var value: String)

val mapper = jacksonObjectMapper()
val stepsList = mapper.readValue<List<ActivitiesSteps>>(jsonSteps)

Exception in thread "main" com.fasterxml.jackson.databind.exc.MismatchedInputException:
Cannot deserialize instance of `java.util.ArrayList` out of
START_OBJECT token at

[Source: (String)"{"activities-steps":[
{"dateTime":"2018-04-17","value":"11045"},
{"dateTime":"2018-04-25","value":"8585"},
{"dateTime":"2018-04-26","value":"11218"},
{"dateTime":"2018-04-27","value":"10462"},
{"dateTime":"2018-04"[truncated 762 chars]; line: 1, column: 1]