Hibernate: I don't want delete child

Question

I'm italian and i apologize for my english.

I have two POJO classes that rappresents a parent and a child table in my Db.

Parent. Persona.java

@Id @GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@Column(name = "nome", length = 30, nullable = false)   
private String nome;

@Column(name = "cognome", length = 30, nullable = false)
private String cognome;

@Column(name = "eta")
private int eta;

@OneToMany(cascade = {CascadeType.PERSIST, CascadeType.REFRESH}, mappedBy = "persona", orphanRemoval = false)
@Column(nullable = true)
private List<Telefono> numeriDiTelefono;

// Others getters and setters

Child. Telefono.java

@Id
@Column(name = "numero_telefono")
private String numeroDiTelefono;

@Column(name = "tipo")
private String tipo;


@ManyToOne(cascade = {CascadeType.REMOVE, CascadeType.PERSIST })
@JoinColumn(name = "persona_id", nullable = true)
private Persona persona;

// Others getters and setters

I have used annotations for mapping those classes in database.

When i try to delete a Persona from the database, hibernate delete the associated Telefono with that Persona, I don't want it. I would that the child references to has a null value in the field persona_id in the Telefono table, how to obtaining that results? What annotations shoulds I used? Thanks for everyone.

Answer 1

JPA is not magic.

As @Andy Dufresne suggested, remove the CascadeType.REMOVE annotation. Then you have to set Persona to null in the Telefono, and clear the Telefono collection of the Persona before removing the Persona from the persistence context. So you have to remove all associations.

You can even combine this with the @PreRemove annotation.