Hibernate: @ValueGenerationType within an EmbeddedId does not work when doing INSERT

I am trying to add to my project (use Spring 5.0.2, Spring-data-jpa 2.0.5 and Hibernate 5.2.14) a new annotation that allows me to obtain the date directly from the database (Postgresql) instead of the VM.

For this, I have taken as my base the following article .

The problem is that the INSERT that Hibernate is trying to do in the database and that is displayed by the console, does not include current_date in the field that it would touch, but tries to insert a null value and, being a PK and do not admit the null value, a restriction exception is violated.

In summary, it seems that you are not invoking the new annotation that I have created and with which I decorate the corresponding attribute, do I need to configure something else? Do I have to add another previous annotation?

My new entry DataBaseDate:

@ValueGenerationType(generatedBy = DataBaseDateGenerator.class)
@Retention(RetentionPolicy.RUNTIME)
public @interface DataBaseDate {

    GenerationTiming getGenerationTiming() default GenerationTiming.ALWAYS;

}

My DataBaseDateGenerator class:

public class DataBaseDateGenerator implements AnnotationValueGeneration<DataBaseDate> {

    private static final long serialVersionUID = 1L;

    @Override
    public GenerationTiming getGenerationTiming() {
        return GenerationTiming.ALWAYS;
    }

    @Override
    public ValueGenerator<?> getValueGenerator() {
        // no in-memory generation
        return null;
    }

    @Override
    public boolean referenceColumnInSql() {
        return true;
    }

    @Override
    public String getDatabaseGeneratedReferencedColumnValue() {
        return "current_date";
    }

    @Override
    public void initialize(final DataBaseDate annotation, final Class<?> propertyType) {
        // do nothing
    }

}

The class that defines the Embeddable id:

@Embeddable
public class ComplexJPAPK implements Serializable {

    private static final long serialVersionUID = 1L;

    @Column(name = "id_anuncio", updatable = false, nullable = false)
    private Integer idAnuncio;

    @Column(name = "fecha_alta", updatable = false, nullable = false)
    @DataBaseDate(getGenerationTiming = GenerationTiming.INSERT)
    private LocalDate fechaAlta;

    public ComplexJPAPK() {
        super();
    }

    // getters/setters omitidos para simplificar la lectura

}

The class that defines the EmbeddedId:

@Entity
public class ComplexJPA  {

    @EmbeddedId
    private ComplexJPAPK id;

    private String codArticulo = StringUtils.EMPTY;

    public ComplexJPA() {
        super();
    }

    // getters/setters omitidos para simplificar la lectura
}

The class that contains ComplexJPA:

@Entity
@Table(name="anuncio")
public class AnuncioJPA  {

    @OneToMany(mappedBy = "anuncio", cascade = { CascadeType.PERSIST,
            CascadeType.MERGE }, orphanRemoval = false, fetch = FetchType.LAZY)
    private final List<ComplexJPA> complexJPAList= new ArrayList<>();

    // Resto de elementos omitidos para simplificar la lectura

    public AnuncioJPA() {
        super();
    }
}

The SQL code that is displayed by console when trying to "save" the object and where pre-guess should show the function current_date instead of waiting for a parameter:

Hibernate: insert into complexJPA(responsable, fecha_alta, anuncio_anuncio_id) values (?, ?, ?)

In any case, I have omitted the code to add the ComplexJPA element to the APJPA class and the call to saveAndFlush () in its repository, because if I initialize the date (with LocalDate.now ()), it works correctly, so I assume that the problem does not come from there.