Spring Data JPA @OneToOne annotation Infinite Recursion Error

Question

Husband.java

package com.example.demo.com.example.domain;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstruc         


        

Answer 1

This is a known issue, when you have bidirectional relation jackson will try to serialize each reference of one side from the other side so its logical to have infinite recursion.

Solution: There are many solutions to that , you could use @JsonIgnore on one side to avoid serializing the annotated reference hence breaking the infinite recursion

 @EqualsAndHashCode(exclude = "husband",callSuper = false)
 @Entity
@Table(name = "t_wife")
public class Wife {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

private String name;

@OneToOne(mappedBy = "wife",cascade = {CascadeType.ALL})
@JsonIgnore
private Husband husband;

//omitted getter/setter
}

you also could use @JsonManagedReference/@JsonBackReference, check this link for more info how to use them

This answer has one problem , if you try to serialize wife direction you will not have husband object since the solution was to avoid serializing it.

There is a nice solution to this, its mentioned in this link , the idea is to generate a reference to the parent entity, so if you are serializing husband, you will have husband->wife->[reference to husband instead of husband], all you need to do is to annotate your entities with @JsonIdentityInfo

@EqualsAndHashCode(exclude = "husband",callSuper = false)
@Entity
@Table(name = "t_wife")
@JsonIdentityInfo(generator=ObjectIdGenerators.UUIDGenerator.class, property="@id")
public class Wife {

@JsonIdentityInfo(generator=ObjectIdGenerators.UUIDGenerator.class, property="@id")
@Entity
@Table(name = "t_husban")
public class Husband {
@Id