Cant get hibernate to update object without EntityExistException being thrown - sql

Question

I am trying to do a bidirectional one to one relation and when updating the AccountExtrasModel on the first save it works fine but when updating I get either an error or the sql statements adds an insert and then a delete instead of an update.
import lombok.*;
import javax.persistence.*;
#ToString
#NoArgsConstructor
#Getter
#Setter
#Entity
#Table(name = "Account")
public class AccountModel {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long Account_ID;
#Column(nullable = false, updatable = false)
private String name;
#Column(nullable = false, unique = true, updatable = false)
private String email;
#Column(nullable = false, updatable = false)
private String password;
#OneToOne(mappedBy = "accountModel", cascade = CascadeType.ALL, orphanRemoval = true)
private AccountExtrasModel accountExtras;
public AccountModel addExtras(AccountExtrasModel accountExtrasModel) {
accountExtrasModel.setAccountModel(this);
this.setAccountExtras(accountExtrasModel);
return this;
}
}
import lombok.*;
import javax.persistence.*;
#Setter
#Getter
#NoArgsConstructor
#ToString
#Entity
#Table(name = "AccountExtras")
public class AccountExtrasModel {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long ID;
#OneToOne(fetch = FetchType.LAZY)
#MapsId
private AccountModel accountModel;
#Lob
private String description;
private String[] myVideos;
private String[] likedVideos;
private String imageReference;
}
If i change the #MapsId to #JoinColumn in AccountExtrasModel then i get the desired result but what its doing is inserting a new row and linking it to acccount and then deleting the old row instead of doing an update.
This is the error im getting:
{
"timestamp": "2018-04-26T18:19:01.657+0000",
"status": 500,
"error": "Internal Server Error",
"message": "A different object with the same identifier value was already associated with the session : [com.alttube.account.models.AccountExtrasModel#1]; nested exception is javax.persistence.EntityExistsException: A different object with the same identifier value was already associated with the session : [com.alttube.account.models.AccountExtrasModel#1]",
"path": "/update_account"
}
What can i do to get the desired result which is to simply perform an update on the accountExtrasModel to the corresponding account to which it belongs?

Answer 1

If you update an AccountModel instance by setting a new instance of AccountExtrasModel, as you do in addExtras(), then it is normal to have a delete+insert. By updating the id you would end with orphaned records.
When you set new values on AccountExtrasModel instance, check if accountExtras is initialized. If not, do the addExtras() stuff. If it is, do not replace it, just change it, so hibernate will generate an update on the extras table (but keep the record id unchanged).

Answer 2

Instead of use the method save try use the method merge, because in case of object exist in database the framework will update this object.
Case the object don't exist, the framework will insert as normal.
Regards!