Is there a way to convert table entries from an old table to a new one using the same entity class?

To be specfic, here are my entity class' annotations for the new table:

```
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "benutzer_id")
private Integer benutzerId;
@Basic(optional = false)
@Column(name = "benutzer_name")
private String benutzerName;
@Column(name = "benutzer_vorname")
private String benutzerVorname;
@Column(name = "benutzer_nachname")
private String benutzerNachname;
@JoinColumn(name = "gruppe_id", referencedColumnName = "gruppe_id")
@ManyToOne(optional = false)
private Gruppe gruppe;
@OneToMany(mappedBy = "benutzer")
private Collection<Bestellung> bestellungen;

```

The columns "benutzer\_vorname" and "benutzer\_nachname" are missing in the old table, so Hibernate crashes, if it tries to map the table entries.

Do I have to create a new entity class or is it possible to convert the data using the existing one?