Entity listener does not run correctly in JPA

I'm having trouble running the listeners correctly in JPA.

The project uses:

JPA 2.1.

EclipseLink 2.6.3

MySql 5.7.11

I have an author entity marked with the annotation OneToMany and orphanRemoval = true to the entity Book, when in the author entity I delete the reference to a book and try to update it, no listener of the book class is running.

I add the code so you can see what it is about.

@Entity
@Table(name = "ges_autor")
public class Autor  implements Serializable, ItemIf {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private long id;

    @OneToMany(mappedBy = "autor",cascade = {CascadeType.ALL},  fetch = FetchType.LAZY, orphanRemoval = true)
    //@PrivateOwned he probado poniendola y tampoco funciona
    protected List<Libros> libros;

//getters y setters
}

@Entity
@Table(name = "ges_libro")
@EntityListeners({LibroListener.class})
public class Libro implements Serializable, ItemIf {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private long id;

    @ManyToOne
    @JoinColumn(name="autor_id")
    protected Autor autor;

//getters y setters
}



public class LibroListener {
    @PrePersist
    private prePersist(Libro libro){
         System.out.println("Listener libro persist ejecutado");
    }
    @PreUpdate
    private preUpdate(Libro libro){
         System.out.println("Listener libro update ejecutado");
    }
    @PreRemove
    private preRemove(Libro libro){
        System.out.println("Listener libro remove ejecutado");
    }
}

To reproduce the error, simply load an author of the database, delete a book and make a merge.

Autor autor = getFacade().find(id);
autor.getLibros().remove(libro);
getFacade().merge(autor);

The orphanRemoval annotation works and the book is deleted from the database but no listener is running.