Java Community | Help. Code. Learn.•3w ago

@MapsId not works

I have two entities as below, and I would like the "cart" entity to have the same id as the Customer entity of its respective relationship @Entity @NoArgsConstructor @Getter @Setter public class Customer extends User { public Customer(LoginAndRegisterDto dto) { super(dto); } @OneToOne(cascade = CascadeType.ALL) private Cart cart; @PrePersist public void generateCart(){ if(cart ==null){ Cart carro = new Cart(); cart=carro; cart.setCostumer(this); } } } The cart Entity: @Entity @Getter @Setter public class Cart { @Id private Long id; @OneToOne(mappedBy = "cart") @MapsId @JoinColumn(name = "id") private Customer costumer; @OneToMany(cascade = {CascadeType.PERSIST,CascadeType.MERGE,CascadeType.REMOVE},orphanRemoval = true ,mappedBy = "cart") private Set<Order> orders; }

25 Replies

JavaBot•3w ago

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JavaBot•3w ago

Please format your code to make it more readable. For java, it should look like this:

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public void foo() {
 
}
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```java
public void foo() {
 
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```

redOP•3w ago

stack.txt

redOP•3w ago

The full stacktrace

dan1st•3w ago

Does it wirk without inheritance?

redOP•3w ago

I wish it worked with inheritance

Suika•3w ago

The User abstract entity: @Getter @Setter @Entity @NoArgsConstructor @Inheritance(strategy = InheritanceType.JOINED)

public abstract class User   {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    @Getter
private Long id;
@Column(unique = true)
private String email;
private String password;

public List<Role> roles;
public User(LoginAndRegisterDto dto) {
    this.email=dto.email();
    this.password=dto.password();
}
public boolean isAdmin(){
    return this.roles.contains(Role.ADMIN);
}

}

public abstract class User   {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    @Getter
private Long id;
@Column(unique = true)
private String email;
private String password;

public List<Role> roles;
public User(LoginAndRegisterDto dto) {
    this.email=dto.email();
    this.password=dto.password();
}
public boolean isAdmin(){
    return this.roles.contains(Role.ADMIN);
}

}

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dan1st•3w ago

try it without inheritance- if you know about whether or not that works, you are one step further or try private User customer in the @MapsId column

redOP•3w ago

It didn't work

dan1st•3w ago

yeah I think the combination of inheritance with MapsId isn't supported by Hibernate, see also https://stackoverflow.com/a/68688543/10871900

Stack Overflow

Hibernate joined table inheritance im combination with OneToOne and...

Using Hibernate in combination with mysql. When I try to create a @OneToOne Relationship from a child of a joined table inheritance while also using @MapsId to map the Id of the joined table child...

redOP•3w ago

The problem is that if I remove the inheritance between User and customer, I would have to refactor a lot of code. Oh Thanks, I think this saved me a few hours trying to debug this

JavaBot•3w ago

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dan1st•3w ago

Does that really need to be the primary key? Can't you specifically another primary key and just use a UNIQUE constraint on that field there?

redOP•3w ago

A basic identifier would be enough, not necessarily a primary key

dan1st•3w ago

then you don't need @MapsId I guess but in general: Avoid inheritance with JPA

redOP•3w ago

Why? I got curious

dan1st•3w ago

because it just causes issues all the time especially when it gets more complicated

redOP•3w ago

Well, I'll review that inheritance then Anyway, thanks for the help

dan1st•3w ago

but for this if it's too much effort: you could still use inheritance but with a different @Id but no @MapsId

redOP•3w ago

How would it look?

dan1st•3w ago

public class Cart {
    @Id
    private Long id;
    //no @MapsId
    @OneToOne(...)
    private Customer customer;
}

public class Cart {
    @Id
    private Long id;
    //no @MapsId
    @OneToOne(...)
    private Customer customer;
}

I left a few things out for simplicity you even have the @Id already

redOP•3w ago

No need for @GeneratedValue?

dan1st•3w ago

left a few things out for simplicity

redOP•3w ago

Oh, I got it I'll try again

JavaBot•3w ago

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@MapsId not works

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