how to Fix spring boot one to many bidirectional infinity loop?

Question

i am try to create a one to many bidirectional mapping using spring boot and spring data jpa please look the below entity

Employer Entity

Answer 1

You can solve your issue with two modification with annotations.
Employer.class

@Entity
public class Employer {
    private Long id;
    private String employerName;

    @OneToMany(cascade = CascadeType.ALL,
            mappedBy = "employer",
            orphanRemoval = true)
    private List<Employee> employees;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getEmployerName() {
        return employerName;
    }

    public void setEmployerName(String employerName) {
        this.employerName = employerName;
    }

    public List<Employee> getEmployees() {
        return employees;
    }

    public void setEmployees(List<Employee> employees) {
        this.employees = employees;
    }
}

Employee.class

@Entity
public class Employee {
    private Long id;
    private String employeeName;


    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "employer_id")
    private Employer employer;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getEmployeeName() {
        return employeeName;
    }

    public void setEmployeeName(String employeeName) {
        this.employeeName = employeeName;
    }

    public Employer getEmployer() {
        return employer;
    }

    public void setEmployer(Employer employer) {
        this.employer = employer;
    }
}

For more information please visit this link.

Answer 2

with the JSON its a problem with bi-directional mapping. Use the below properties.

@JsonIgnoreProperties("employer")
@JsonIgnoreProperties("employees")

please keep fetching type as eager.

hope this will work.

Answer 3

Instead of using @JsonBackReferenceand @JsonManagedReference try to use annotation @JsonIgnoreProperties:

@JsonIgnoreProperties("employer")
private List<Employee> employees;  

@JsonIgnoreProperties("employees")
private Employer employer;  

It prevents Jackson from rendering a specified properties of associated objects.