EntityClass has no primary key specified (InheritenceType.JOINED)

Java-Forum Jakarta EE (Java EE)
1

Hallo, ich habe folgendes Problem:

Ich habe 2 Klassen “Oberklasse” und “Unterklasse”:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class Oberklasse implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
//...
}

@Entity
public class Unterklasse extends Oberklasse implements Serializable {
    private static final long serialVersionUID = 1L;
//...
}

Unterklasse benötigt meiner Meinung nach keinen eigenen PrimaryKey, da dieser ja von Oberklasse geerbt wird. Jetzt meckert aber mein Glassfish 3.1.2.2 folgendes:

Exception Description: Predeployment of PersistenceUnit [FundraisingManagerPU] failed.
Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class Unterklasse] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.
org.glassfish.deployment.common.DeploymentException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [FundraisingManagerPU] failed.
Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class Unterklasse] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.

Ich hoffe, mir kann da jemand helfen…stehe irgendwie voll auf dem Schlauch…

2

Bei InheritanceType.JOINED brauchst du IMHO eine ID, weil eine andere Tabelle pro SubClass verwendet wird.

3

Hi,

versuch es mit der @MappedSuperClass Annotation:

public abstract class AbstractIdVO implements IPSValueObject {

	private static final long serialVersionUID = 1L;

	@Id
	@Column(name = "id")
	private String id = UUID.randomUUID().toString();

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String toString() {
		return "AbstractIdVO [id=" + id + "]";
	}

}

Bei jeder Subclass dann: (Hinweis: Bei mir ist noch eine Klassenhierarchie dazwischen "AbstractTrackingVO, dass jedoch genau wie „AbstractIdVO“ annotiert ist.

@Table(name = "users", uniqueConstraints = { @UniqueConstraint(columnNames = { "username" }) })
public class UserVO extends AbstractTrackingVO {

	private static final long serialVersionUID = 1L;

	@Column(name = "password")
	private String password = null;

	@Column(name = "username")
	private String username = null;
}```

Gruß,

Martin
4

Danke Martin, damit hat es funktioniert :slight_smile: