Jackson: Multiple back-reference properties with name 'defaultReference'

Question

I\'m trying to map a json (string format) to an object and I get the following error

com.fasterxml.jackson.databind.JsonMappingException: Multiple back-

Answer 1

I think the best way to handle this is using @JsonIdentityInfo annotation.see the thread which demonstrate this.How to use @JsonIdentityInfo with circular references?

Answer 2

I also faced this issue, and resolved it. You should name all JsonManagedReferences and JsonBackReference in your application.

example : @JsonManagedReference(value="user-person") @JsonBackReference(value="user-person")

Answer 3

If you use @JsonBackReference on more than one getter/setter method in your project, you should distinguish them with a specific reference name.

Maybe only one 'defaultReference' is allowed in the latest version?

e.g

In MovementView.java

@JsonBackReference(value="user-movement")
public User getUser() {
    return user;
}

In User.java

@JsonManagedReference(value="user-movement")
public MovementView getMovementView() {
    return movementView;
}

Answer 4

I also faced this issue, but resolved it.

//This is parent class
@Entity
@Table(name = "checklist")
@JsonIgnoreProperties("inspection")
public class Checklist implements java.io.Serializable {

    @ManyToOne
    @JoinColumn(name = "product_id", referencedColumnName = "id")
    @JsonBackReference
    private Product product;

    @OneToMany(mappedBy = "checklists", cascade = CascadeType.ALL)
    @JsonManagedReference
    private Set<Inspection> inspection = new HashSet<Inspection>();
//Constructor
//Getter and Setter
}

//This is child class
@Entity
@Table(name = "inspections")
public class Inspection {

    @ManyToOne
    @JoinColumn(name = "chk_id", referencedColumnName = "id")
    private Checklist checklists;
//Constructor
//Getter and Setter
}

By mentioning @JsonIgnoreProperties("inspection") and @JsonManagedReference.

Resolved the issue raised by using two @JSONBackRefrence in same parent class.