MismatchedInputException: Cannot construct instance of `java.util.LinkedHashMap`

Question

I tried to map LinkedHashMap in JSON in my kotlin testcase. while I am converting json to object using jackson-objectmapper, I have got below issue, Kindly help me to solve this.

construct instance of java.util.LinkedHashMap (although at least one 
Creator exists): no String-argument constructor/factory method to 
deserialize from String value ('{e123f1dd-6c54-4b01-90e6- 
d701748f0851=class MyClass {

My Kotlin testcase below

fun `testcase success`() {

val mapId = UUID.fromString("e123f1dd-6c54-4b01-90e6-d701748f0851");
  val Idno = UUID.randomUUID();

  val order = MyClass();

  val map : LinkedHashMap<String, MyClass> = LinkedHashMap();

  order.collectiveSignature=true
  order.docId="5436576"
  order.status=OnboardOrderPoaStatusTPL.NOT_SIGNED
  order.createdAt=createdDate
  order.updatedAt=updatedDate
  order.portingAt=OffsetDateTime.parse("2018-09-21T14:22:24.682+02:00");
  order.fastPorting=true
  order.owner=MyAnotherClass();
  order.owner.company="test"
  order.owner.firstName="test"
  order.owner.lastName="test"
  order.owner.city="test"
  order.owner.zip="5436"
  order.owner.street="test"
  order.owner.house="test"


  map["e123f1dd-6c54-4b01-90e6-d701748f0851"] = order;

  val body = """{

          "mapId": "$mapId",
          "Idno": "$Idno",
          "name": "Abishek",
          "poas":"$map"

         }""".trimIndent()

  val mapper = ObjectMapper()
  mapper.findAndRegisterModules()

  mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
  mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
  mapper.configure(DeserializationFeature.EAGER_DESERIALIZER_FETCH, false);


  val input = mapper.readValue<MainClass>(body)


}

Bukharov Sergey · Accepted Answer · 2019-05-30 10:37:27Z

1

The problem is poas value contains String representation of Map, which contains String representation of MyClass. Indeed, insead of creating Json representation you called MyClass.toString() and purpose of toString is show debug information.

How to fix it?

Using ObjectMapper you should convert Map to json, instead of using toString()

  val body = """{

          "mapId": "$mapId",
          "Idno": "$Idno",
          "name": "Abishek",
          "poas": "${mapper.writeValue(map)}"

         }""".trimIndent()

edited May 30, 2019 at 10:37

answered May 30, 2019 at 6:30

Bukharov Sergey

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