Infinity loop when using findAll() Spring JPA PostgreSQL

Question

Here is my entitiy:

@Entity
@Table(name = "remind")

public class Remind {

@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
private long id;

@Column(name = "title", nullable = false, length = 50)
private String title;

@Column(name = "remind_date", nullable = false)
@Temporal(TemporalType.TIMESTAMP)
private Date remindDate;


public Remind() {
}

public long getId() {
    return id;
}

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

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public Date getRemindDate() {
    return remindDate;
}

public void setRemindDate(Date remindDate) {
    this.remindDate = remindDate;
}

 //---Dependency---->

@OneToOne(optional = false)
@JoinColumn(name="id_user", unique = true, nullable = true, updatable = false)
private Users user;

public void setUser(Users user) {
    this.user = user;
}

public Users getUser() {
    return user;
}



}

And here is another entity:

@Entity
@Table(name = "users")

public class Users {

@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
private long id;

@Column(name = "name", nullable = false, length = 50)
private String name;

public Users() {
}

public long getId() {
    return id;
}

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

public String getName() {
    return name;
}

public void setName(String title) {
    this.name = name;
}



 //---Dependency---->

@OneToOne(optional = false, mappedBy="user")
public Remind remind;

public Remind getRemind() {
    return remind;
}

public void setRemind(Remind remind) {
    this.remind = remind;
}

Here is diagram that Idea shows me:

But when I use in RemindController.class:

@RequestMapping(value = "/get", method = RequestMethod.GET)
@ResponseBody
public List<Remind> getReminder() {
    List<Remind> list = remindRepository.findAll();
    return list;
}

I have this result... infinity loop:

What am I do wrong? It seems like diagram is ok. Help me please(

Observation: makes no sense using the non-portable "increment" generator. JPA provides strategy of "GenerationType.INCREMENT" so then would work with all JPA providers. — Neil Stockton, Mar 13 '16 at 11:40
Ok, thanks, I will change it. But is doesn't solve my problem( — Tom Wally, Mar 13 '16 at 12:23

score 2 · Accepted Answer · edited May 23 '17 at 12:07

2

It's not jpa problem. It's a problem with serializing your entity to json. You need to explicitly mark the relation as bidirectional so the serializer can skip one end.

For Spring I'm assuming you're using jackson.

Take a look at answers to this question.

edited May 23 '17 at 12:07

Community

1
1

answered Mar 13 '16 at 12:39

Tuan Pham

1,171
2
15
27

@TomWally I'm glad it helped, but be aware that using `@JsonIgnore` will cause your field to always be ignored. It that's not something you want, take a look at `@JsonManagedReference` and `@JsonBackReference` or `@JsonIdentity`. – Tuan Pham Mar 13 '16 at 12:53

Infinity loop when using findAll() Spring JPA PostgreSQL

1 Answers1