CODEWITHSUNDEEP
jsonhibernatehttpjakarta-ee
zexco2
zexco2

Reputation: 159

How to get response Entity with List?

I have Object which has attribute: List<Node> nodeChild; When I return response: return new ResponseEntity<>(myObject, HttpStatus.OK); In browser I get json with all attributes , but without list nodeChild inside myObject .

Entety: 

@Entity
@javax.persistence.Table(name="node")
public class Node implements Serializable {

@Id
@GeneratedValue
@Column(name="id_node")
protected int id_node;
@ManyToOne
@JoinColumn(name="id_parent")
protected Node id_parent;

@Column(name="node_name")
protected String node_name;

@JsonBackReference
@OneToMany(fetch = FetchType.EAGER,mappedBy = "id_parent",cascade =     CascadeType.ALL)
protected List<Node> nodeChild;

This is what I got:

{"id_node":2,"id_parent":{"id_node":1,"id_parent":null,"node_name":null},"node_name":null}

In java when I try before return response ... myObject.getNodeChild(); I got the list.

Upvotes: 0

Views: 392

Answers (1)

Dragan Bozanovic
Dragan Bozanovic

Reputation: 23562

You have to annotate id_parent with @JsonBackReference, and nodeChild list with @JsonManagedReference, as described here:

@JsonManagedReference is the "forward" part of reference: one that gets serialized normally, and handling of which triggers back-linkage for the other reference. Annotated property can be a bean, array, Collection (List, Set) or Map type, and it must be a bean property (handled by a property of type serialized using BeanSerializer).

@JsonBackReference is the "back" part of reference: it will be omitted from serialization, and re-constructed during deserialization of forward reference. Annotated property must be of bean type.

Upvotes: 1

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