如何扩展@Entity(How to extend an @Entity)

 这是我的超类 
 
@Entity
@Table(name = "utente")
@Component
@Inheritance
public class Utente implements Serializable{

    private static final long serialVersionUID = -7124540331184173742L;

    @Id
    @GeneratedValue
    @Column(name = "id")
    private int id;

    @Column(name = "nome")
    @Size(min = 1, max = 20)
    @Pattern(regexp="^[A-Za-z 'òàùèéì]*$")      
    @NotBlank
    private String nome;

    @Column(name = "cognome")
    @Size(min = 1, max = 20)
    @Pattern(regexp="^[A-Za-z 'òàùèéì]*$")
    @NotBlank
    private String cognome;

    @Column(name = "email")
    @Email
    @Size(min = 1, max = 40)
    private String email;

    @OneToOne(mappedBy = "utente", cascade = CascadeType.ALL)
    @Valid
    private Autenticazione autenticazione;  

    @OneToMany(mappedBy = "utente", fetch = FetchType.EAGER,  orphanRemoval=true, cascade=CascadeType.ALL)  
    private List<Autorizzazioni> autorizzazioniLista;
}
 
 这是扩展上述类的类： 
 
@Entity
public class UtenteSubClass extends Utente{ 

@Transient
private String newField;
}
 
 当我尝试检索对象UtenteSubClass时，我收到此错误"org.hibernate.util.JDBCExceptionReporter - Unknown column 'this_.DTYPE' in 'where clause'" 。 
 
 可能我的“绘图系统”是错误的。 我的错误在哪里？ 
 
 先谢谢你。 

This is my superclass
 
@Entity
@Table(name = "utente")
@Component
@Inheritance
public class Utente implements Serializable{

    private static final long serialVersionUID = -7124540331184173742L;

    @Id
    @GeneratedValue
    @Column(name = "id")
    private int id;

    @Column(name = "nome")
    @Size(min = 1, max = 20)
    @Pattern(regexp="^[A-Za-z 'òàùèéì]*$")      
    @NotBlank
    private String nome;

    @Column(name = "cognome")
    @Size(min = 1, max = 20)
    @Pattern(regexp="^[A-Za-z 'òàùèéì]*$")
    @NotBlank
    private String cognome;

    @Column(name = "email")
    @Email
    @Size(min = 1, max = 40)
    private String email;

    @OneToOne(mappedBy = "utente", cascade = CascadeType.ALL)
    @Valid
    private Autenticazione autenticazione;  

    @OneToMany(mappedBy = "utente", fetch = FetchType.EAGER,  orphanRemoval=true, cascade=CascadeType.ALL)  
    private List<Autorizzazioni> autorizzazioniLista;
}
 
This is the class that extend the one above:
 
@Entity
public class UtenteSubClass extends Utente{ 

@Transient
private String newField;
}
 
When I try to retrieve an object UtenteSubClass I get this error "org.hibernate.util.JDBCExceptionReporter - Unknown column 'this_.DTYPE' in 'where clause'".
 
Probably my "mapping system" is wrong. Where is my error?
 
Thank you in advance.

原文：https://stackoverflow.com/questions/36127632