Jackson: JsonAnyGetter: Contents of the map are serialized like actual properties of the object

@ JsonAnyGetter is used to serialize the properties of the map as they were actual properties of the map.

public class Employee {

         private Map<String, String> additionalInformation = new HashMap<>();

         @JsonAnyGetter

         public Map<String, String> getAdditionalInformation() {

                  return additionalInformation;

         }

         public void setAdditionalInformation(Map<String, String> additionalInformation) {

                  this.additionalInformation = additionalInformation;

         }

}

Find the below working application.

Employee.java

package com.sample.model;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({ "firstName", "lastName", "hobbies", "id" })
public class Employee {

 @JsonProperty("EMPLOYEE_DD")
 private int id;

 @JsonProperty("EMPLOYEE_FIRST_NAME")
 private String firstName;

 @JsonProperty("EMPLOYEE_LAST_NAME")
 private String lastName;

 private Map<String, String> additionalInformation = new HashMap<>();

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 @JsonAnyGetter
 public Map<String, String> getAdditionalInformation() {
  return additionalInformation;
 }

 public void setAdditionalInformation(Map<String, String> additionalInformation) {
  this.additionalInformation = additionalInformation;
 }

}

App.java

package com.sample.app;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.sample.model.Employee;

public class App {

 public static void main(String args[]) throws JsonGenerationException, JsonMappingException, IOException {
  Employee emp = new Employee();

  emp.setFirstName("Hari Krishna");
  emp.setLastName("Majety");
  emp.setId(1);

  emp.getAdditionalInformation().put("hobby1", "Cricket");
  emp.getAdditionalInformation().put("hobby2", "Football");

  ObjectMapper mapper = new ObjectMapper();
  mapper.writeValue(System.out, emp);
 }
}

Output

{"EMPLOYEE_FIRST_NAME":"Hari Krishna","EMPLOYEE_LAST_NAME":"Majety","EMPLOYEE_DD":1,"hobby2":"Football","hobby1":"Cricket"}

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