CODEWITHSUNDEEP
jsonhibernatejackson
Vinicius Carvalho
Vinicius Carvalho

Reputation: 4156

Infinite Recursion with Jackson

I'm having problems with Jackson 1.6.3 and Hibernate. I found this thread here : Infinite Recursion with Jackson JSON and Hibernate JPA issue

But it did not solve the problem.

I have a Node object that has incoming and outgoing relations. Even with the @JsonManagedReference annotations, on the console of the app server I can see the exceptions being thrown (infinite recursion).

Is there any alternative to that?

@Entity
@Table(name="nodes")
public class Node implements Serializable {

@Id
private String id;

@Column(name="x_pos")
private double x;


@Column(name="y_pos")
private double y;

@OneToMany
@JoinColumn(name="source")
@JsonManagedReference("outgoingRelations")
private Set<Relation> outgoingRelations;


@OneToMany
@JoinColumn(name="target")
@JsonManagedReference("incomingRelations")
private Set<Relation> incomingRelations;



@Entity
@Table(name="relations")
public class Relation implements Serializable {

@Id
private Long id;

@ManyToOne
@JoinColumn(name="source")
@JsonBackReference("outgoingRelations")
private Node source;

@ManyToOne
@JoinColumn(name="target")
@JsonBackReference("incomingRelations")
private Node target;

Regards

Upvotes: 1

Views: 4225

Answers (2)

MyTwoCents
MyTwoCents

Reputation: 7622

We can try to break the loop either at Node end or at Relation by following 3 ways

  • Use @JsonManagedReference and @JsonBackReference
  • Use @JsonIdentityInfo
  • Use @JsonIgnore

Use @JsonIdentityInfo

    @Entity
    @Table(name = "nodes")
    @JsonIdentityInfo(
              generator = ObjectIdGenerators.PropertyGenerator.class, 
              property = "id")
    public class Node {
        ...
    }
    
    
    
    @Entity
    @Table(name = "relations")
    @JsonIdentityInfo(
              generator = ObjectIdGenerators.PropertyGenerator.class, 
              property = "id")
    public class Relation {
        ...
    }

Use @JsonIgnore

@OneToMany(fetch = FetchType.LAZY,mappedBy="node")
@JsonIgnore
private List<Node> lstNode;

Refer more in detail here with the working demo as well.

Upvotes: 0

Matthew Cornell
Matthew Cornell

Reputation: 4184

From spring - Infinite Recursion with Jackson JSON and Hibernate JPA issue:

You may use @JsonIgnore to break the cycle.

Upvotes: 2

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