Jackson Json: how to convert array to JsonNode and ObjectNode?

Question

Given Employee and company class

Company
{
    String companyName;
}

Employee
{
    String employeeName;
}

and my code like the following<

Answer 1

JsonNode result = new ObjectMapper().readTree(e.toString());

Answer 2

ObjectMapper mapper = new ObjectMapper();
List<Employee> e = new ArrayList<Employee>();
ArrayNode array = mapper.valueToTree(e);
ObjectNode companyNode = mapper.valueToTree(company);
companyNode.putArray("Employee").addAll(array);
JsonNode result = mapper.createObjectNode().set("company", companyNode);

Answer 3

List<String> yourList = new ArrayList<>();
((ObjectNode) someNode).set("listname", this.objectMapper.valueToTree(yourList));

Answer 4

You can use jackson ObjectNode's put and putArray like

import com.fasterxml.jackson.databind.node.ObjectNode;
ArrayList<ObjectNode> employee = new ArrayList();
for(int i = 1; i < 4; i++){
  ObjectNode em = Json.newObject();
  em.put("companyName", "cName" + i);
  employee.add(em);
}
ObjectNode company = Json.newObject();
company.put("companyName", "cName");
company.putArray("employee").addAll(employee);
return Json.newObject().put("company", company);

Answer 5

You can just create a POJO that contains a List<Employee>

class Employees {
    @JsonProperty("Employee")
    private List<Employee> employees;

    public List<Employee> getEmployees() {
        return employees;
    }

    public void setEmployees(List<Employee> employees) {
        this.employees = employees;
    }
}

and serialize it to an ObjectNode.

Employees e = new Employees();
List<Employee> employees = new ArrayList<Employee>();
e.setEmployees(employees);
ObjectNode objectNode = mapper.valueToTree(e);