Hibernate ManyToOne - OneToMany loop?

Question

i'm new to hibernate and i use annotations

These are my two tables:

This is my Table "Persona"

 @Entity
@Table(name = "persona")
public class Persona implements java.io.Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "codigo", unique = true, nullable = false)
    private int codigo;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "codTipoIdent", nullable = false)
    private TipoIdentificacion tipoIdentificacion;

    ....

This is my second table "TipoIdentificacion"

@Entity
@Table(name = "tipoIdentificacion")
public class TipoIdentificacion implements java.io.Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "codigo", unique = true, nullable = false)
    private int codigo;

    @Column(name = "nombre", nullable = false)
    private String nombre;

    @Column(name = "siglas", nullable = false)
    private String siglas;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "tipoIdentificacion")    
    private Set<Persona> persona = new HashSet<Persona>(0);

the primary Key of "Persona" is "codigo" and for "TipoIdentificacion" is "codigo" wich is FK from persona (codTipoIdent)

everything looks fine, also i made a crud in my web app really well, but when i debug it for request a list of "TipoIdentificacion" it looks like

it make a loop, why?