How to deserialize escaped json while using Jackson with Retrofit

[Elelan]

{
    "Data": "[{\"LeaveId\":\"9806595202103221\",\"EmpNo\":\"9806595\",\"LeaveType\":\"ANNUAL\",\"DayType\":\"First Half\",\"LeaveDateFrom\":\"03/22/2021\",\"LeaveDateTo\":\"03/22/2021\",\"Remark\":\"test leave\",\"Substitute\":\"132296\",\"ApplyDate\":\"3/18/2021 2:29:07 PM\",\"AllocatedShiftInTime\":\"\",\"AllocatedShiftOutTime\":\"\",\"ShiftAllocationId\":\"\"},{\"LeaveId\":\"9806595202103191\",\"EmpNo\":\"9806595\",\"LeaveType\":\"CASUAL\",\"DayType\":\"First Half\",\"LeaveDateFrom\":\"03/19/2021\",\"LeaveDateTo\":\"03/19/2021\",\"Remark\":\"firebase message test\",\"Substitute\":\"132296\",\"ApplyDate\":\"3/18/2021 9:28:38 AM\",\"AllocatedShiftInTime\":\"\",\"AllocatedShiftOutTime\":\"\",\"ShiftAllocationId\":\"\"}]",
    "ID": "200"
}

val data = mapper.readTree(responseString).get("Data").asText()

val leaveList: Array<LeaveDto> =
                        mapper.convertValue(mapper.readTree(data), Array<LeaveDto>::class.java)

when using retrofit, how can I de-serialize the above JSON response directly to Kotlin data class without manually mapping using ObjectMapper?

[dinomite]

@Elelan One approach would be to register a custom deserializer:

class Data
val objectMapper = jacksonObjectMapper().registerModule(
        SimpleModule().addDeserializer(Data::class.java, object : JsonDeserializer<Data>() {
            val mapper = jacksonObjectMapper()
            override fun deserialize(parser: JsonParser, context: DeserializationContext): Data {
                // Maybe need to unescape parser.text
                return mapper.readValue(parser.text, Data::class.java)
            }
        })
)

Note that this isn't Kotlin specific, so another place to ask is the jackson-user mailing list

[k163377]

Since it appears to be resolved, this issue is closed.