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When to use @JsonManagedReference and @JsonBackReference annotations using Jackson in Java?
The @JsonManagedReference and @JsonBackReference annotations can be used to create a JSON structure in a bidirectional way. The @JsonManagedReference annotation is a forward reference that includes during the serialization process whereas @JsonBackReference annotation is a backreference that omits during the serialization process.
In the below example, we can implement @JsonManagedReference and @JsonBackReference annotations.
Example
import java.util.*;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.JsonProcessingException;
public class ManagedReferenceBackReferenceTest {
public static void main(String args[]) throws JsonProcessingException {
BackReferenceBeanTest testBean = new BackReferenceBeanTest(110, "Sai Chaitanya");
ManagedReferenceBeanTest bean = new ManagedReferenceBeanTest(135, "Adithya Ram", testBean);
testBean.addEmployees(bean);
ObjectMapper mapper = new ObjectMapper();
String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(bean);
System.out.println(jsonString);
}
}
class ManagedReferenceBeanTest {
public int empId = 115;
public String empName = "Raja Ramesh";
@JsonManagedReference
public BackReferenceBeanTest manager;
public ManagedReferenceBeanTest(int empId, String empName, BackReferenceBeanTest manager) {
this.empId = empId;
this.empName = empName;
this.manager = manager;
}
}
class BackReferenceBeanTest {
public int empId = 125;
public String empName = "Jai Dev";
@JsonBackReference
public List<ManagedReferenceBeanTest> list;
public BackReferenceBeanTest(int empId, String empName) {
this.empId = empId;
this.empName = empName;
list = new ArrayList<ManagedReferenceBeanTest>();
}
public void addEmployees(ManagedReferenceBeanTest managedReferenceBeanTest) {
list.add(managedReferenceBeanTest);
}
}Output
{
"empId" : 135,
"empName" : "Adithya Ram",
"manager" : {
"empId" : 110,
"empName" : "Sai Chaitanya"
}
}
Updated on: 08-Jul-2020
3K+ Views
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