Why am i getting an infinite list with stack overflow? - spring

Question

Im making an bungalow reservation system but i cant get a list with an many to many relationship i keep getting an infinite list with stackoverflow error.
This worked find but happens when i added the many to many relationship.
Attraction Entity this contains a many to many relationship with
the visit entity
#Entity
#Table(name = "attraction")
public class Attraction {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "name")
private String name;
#Column(name = "historical")
private Boolean historical;
#Column(name = "religious")
private Boolean religious;
#Column(name = "beaches")
private Boolean beaches;
#Column(name = "animal_sanc")
private Boolean animalSanc;
#Column(name = "hiking")
private Boolean hiking;
#Column(name = "forest")
private Boolean forest;
#Column(name = "parks")
private Boolean parks;
#Column(name = "lakes")
private Boolean lakes;
#ManyToOne
#JoinColumn(name = "bungalow_id")
private Bungalow bungalow;
#ManyToMany(cascade = {CascadeType.MERGE,CascadeType.REFRESH})
#JoinTable(
name = "visit_has_attraction",
joinColumns = #JoinColumn(name = "attraction_id"),
inverseJoinColumns = #JoinColumn(name = "visit_id")
)
private List<Visit> visitList;
//Constructer, Getters and Setters
}
Visit entity
This is the other end of the many to many relationship
#Entity
#Table(name = "visit")
public class Visit {
#Id
#Column(name = "id")
private int id;
#Column(name = "date")
private Date date;
#ManyToOne
#JoinColumn(name = "user_id")
private User user;
#ManyToMany(cascade = {CascadeType.MERGE,CascadeType.REFRESH})
#JoinTable(
name = "visit_has_attraction",
joinColumns = #JoinColumn(name = "visit_id"),
inverseJoinColumns = #JoinColumn(name = "attraction_id")
)
List<Attraction> attractions;
//Constructer, Getters and Setters
}
JPA Repository
public List<Attraction> findAttractionsByVisitList(Visit visit);
ER of the app
1

Answer 1

I added #JsonIgnore to one of the sides in many to many relationships and added #JsonBackReference to ManyToOne side and #JsonManagedReference to OneToMany side of all the one to many relationships.
#Entity
#Table(name = "attraction")
public class Attraction {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "name")
private String name;
#Column(name = "historical")
private Boolean historical;
#Column(name = "religious")
private Boolean religious;
#Column(name = "beaches")
private Boolean beaches;
#Column(name = "animal_sanc")
private Boolean animalSanc;
#Column(name = "hiking")
private Boolean hiking;
#Column(name = "forest")
private Boolean forest;
#Column(name = "parks")
private Boolean parks;
#Column(name = "lakes")
private Boolean lakes;
#ManyToOne
#JoinColumn(name = "bungalow_id")
#JsonBackReference
private Bungalow bungalow;
#ManyToMany(cascade = {CascadeType.MERGE,CascadeType.REFRESH})
#JoinTable(
name = "visit_has_attraction",
joinColumns = #JoinColumn(name = "attraction_id"),
inverseJoinColumns = #JoinColumn(name = "visit_id")
)
#JsonIgnore
private List<Visit> visitList;
//Constructer, Getters and Setters
}
Visit entity
This is the other end of the many to many relationship
#Entity
#Table(name = "visit")
public class Visit {
#Id
#Column(name = "id")
private int id;
#Column(name = "date")
private Date date;
#ManyToOne
#JoinColumn(name = "user_id")
#JsonBackReference
private User user;
#ManyToMany(cascade = {CascadeType.MERGE,CascadeType.REFRESH})
#JoinTable(
name = "visit_has_attraction",
joinColumns = #JoinColumn(name = "visit_id"),
inverseJoinColumns = #JoinColumn(name = "attraction_id")
)
List<Attraction> attractions;
//Constructer, Getters and Setters
}