Can not deserialize instance of java.lang.String out of START_OBJECT token

You're mapping this JSON

{    "id": 2,    "socket": "0c317829-69bf-43d6-b598-7c0c550635bb",    "type": "getDashboard",    "data": {        "workstationUuid": "ddec1caa-a97f-4922-833f-632da07ffc11"    },    "reply": true}

that contains an element named data that has a JSON object as its value. You are trying to deserialize the element named workstationUuid from that JSON object into this setter.

@JsonProperty("workstationUuid")public void setWorkstation(String workstationUUID) {

This won't work directly because Jackson sees a JSON_OBJECT, not a String.

Try creating a class Data

public class Data { // the name doesn't matter     @JsonProperty("workstationUuid")    private String workstationUuid;    // getter and setter}

the switch up your method

@JsonProperty("data")public void setWorkstation(Data data) {    // use getter to retrieve it

If you do not want to define a separate class for nested json , Defining nested json object as JsonNode should work ,for example :

{"id":2,"socket":"0c317829-69bf-43d6-b598-7c0c550635bb","type":"getDashboard","data":{"workstationUuid":"ddec1caa-a97f-4922-833f-632da07ffc11"},"reply":true}@JsonProperty("data")    private JsonNode data;

Data content is so variable, I think the best form is to define it as "ObjectNode" and next create his own class to parse:

Finally:

private ObjectNode data;