休眠子类的字段列表中的未知列

Question

So i'm writing a platform that consists of teams with researchers ( = 'onderzoeker' in Dutch ). Researchers inherit from Role because they need to be able to login with Spring security. Left out all the getters and setters but they are there! Thanks in advance :)

ERROR

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'onderzoeke0_.onderzoekerid' in 'field list'

Class Onderzoeker

 Class onderzoeker




@SuppressWarnings("serial")
@Entity
@DiscriminatorValue(value = "Onderzoeker")
public class Onderzoeker extends Rol {

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

@Column(name="onderzoekernaam")
protected String onderzoekernaam;

@Column(name="onderzoekervoornaam")
protected String onderzoekervoornaam;

@ManyToOne
@JoinColumn(name="onderzoekerteamid")
protected Team team;


    @Override
    public String getType() {
        return "Onderzoeker";
    }

}

Class Role from which Onderzoeker inherits

package be.odisee.oxyplast.domain;


@DiscriminatorOptions(force=true)
@Entity
@Table(name="rollen")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE )
@DiscriminatorColumn(name="type",
discriminatorType=DiscriminatorType.STRING)
@DiscriminatorValue("Rol")
public abstract class Rol implements Serializable {

@Id
@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
protected int id;



@Column
protected String status;

@Column(unique=true)
@Index(name="IRol_usernaam",columnNames="usernaam")
protected String usernaam;

@ManyToOne
@JoinColumn(name="sessie_id")
protected Sessie sessie;

@ManyToOne
@JoinColumn(name="persoon_id")
protected Persoon persoon;

public Rol(){}

public Rol(String status, String usernaam, Sessie sessie, Persoon persoon) {
    this.status = status;
    this.usernaam = usernaam;
    this.sessie = sessie;
    this.persoon = persoon;
}

public Rol(int id, String status, String usernaam, Sessie sessie, Persoon persoon) {
    this.id = id;
    this.status = status;
    this.usernaam = usernaam;
    this.sessie = sessie;
    this.persoon = persoon;
}

Well this needs to be enough the resolve the question. And yes the database is correct, it needs to be something else

Answer 1

I have the same problem, I finilly found both parent and child class need public default constructor!

parent class:

@MappedSuperclass
public abstract class Order {

    public Order() {

    }
}

child class:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name="ItemOrder")
public class ItemOrder extends Order {

public ItemOrder() throws Exception {
    super();        
}

I hope this answer helps someone.