MappedSuperclass - Change SequenceGenerator in Subclass without @GeneratedValue on the Superclass

Question

I have a base class:

@MappedSuperclass
public abstract class SuperClass{
    @Id
    protected Long id;

    public Long getId() {
        return id;
    }
}

The @GeneratedValue is not used since the id is generated using a BackendSession

There are a lot of inheritance from this class so one can't change it!

my sub class: I tried to override the getId method

@Entity
@Table(name = "FTC_DATA")
@SequenceGenerator(name="sequence", sequenceName = "FTC_DATA_SEQ")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class SubClass extends SuperClass {

    @Override
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "FTC_DATA_SEQ")
    public void getId(Long id) {
        this.id = id;
    }
}

But I fail on IdentifierGenerationException, what am I doing wrong?

Maybe this answers your question: stackoverflow.com/questions/8589928/… — R.Groote
– R.Groote, Commented Feb 13, 2020 at 6:50
I tried stackoverflow.com/questions/8589928/… - but it is with changing the super class to have GeneratedValue. — Avital A.
– Avital A., Commented Feb 13, 2020 at 6:57

JR Ector · Accepted Answer · 2022-08-17 19:59:39Z

0

Here's what worked for me. Remove getId() from SuperClass, remove the @Override from SubClass getId() and move the @Id annotation to the SubClass getId().

answered Aug 17, 2022 at 19:59

JR Ector

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5 Comments

Haroldo Macedo Over a year ago

It may solve the problem.However, if the id is used in other subclasses, by removing it from the superclass you break all other subclasses.

JR Ector Over a year ago

I have a total of 6 subclasses and this is not a problem.

JR Ector Over a year ago

Just to clarify. The ID attribute is not removed, just the getter.

Haroldo Macedo Over a year ago

Ah, OK. Should it work to move the @Id to the method in the super class?

JR Ector Over a year ago

I have @Id in the subclasses. If I remember correctly it didn't work when it was in the superclass.

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