how to solve could not write json 3a infinite recursion 28stackoverflowerror 29

1// Business Object 1:
2
3@Entity
4@Table(name = "ta_trainee", uniqueConstraints = {@UniqueConstraint(columnNames = {"id"})})
5public class Trainee extends BusinessObject {
6
7    @OneToMany(mappedBy = "trainee", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
8    @Column(nullable = true)
9    @JsonManagedReference
10    private Set<BodyStat> bodyStats;
11
12// Business Object 2:
13
14@Entity
15@Table(name = "ta_bodystat", uniqueConstraints = {@UniqueConstraint(columnNames = {"id"})})
16public class BodyStat extends BusinessObject {
17
18    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
19    @JoinColumn(name="trainee_fk")
20    @JsonBackReference
21    private Trainee trainee;