Error when trying to insert an extended entity: invalid column index

问题

I have two entities for two classes. First is an extended class of the second (Observer pattern): The child:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorValue("User")
@Table(name="SCH.USER")
public class User extends Observer implements Serializable{
    ...fields...
}

And the father:

@Entity
@Inheritance(strategy = InheritanceType.JOINED) 
@DiscriminatorColumn(name = "DISCRIMINATOR", discriminatorType = DiscriminatorType.STRING)
@Table(name="SCH.OBSERVER")
public abstract class Observer implements Serializable{

    @Id
    @SequenceGenerator(name = "OBSERVER_ID_GENERATOR", sequenceName = "NEXO.SEQ_OBSERVER", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "OBSERVER_ID_GENERATOR")
    @Column(name="ID_OBSERVER")
    private Long idObserver;

    @Column(name = "DISCRIMINATOR", nullable=false, length=20)
    private String discriminator;
}

Since I upgraded JPA 2.0 to JPA 2.1 I cannot persist the child entity: em.persist(userInstance); Which generates the next SQL:

insert 
into
    NEXO.OBSERVER
    (DISCRIMINATOR, ID_OBSERVER) 
values
    ('User', ?)

And gets the resulting error:

java.sql.SQLException: invalid column index

I am pretty sure this behavior change has been produced by the upgrade to JPA 2.1

回答1:

@Chris is right. When I upgrade from Jboss7 to Wildfly10, noticed this error and fixed by updating discriminator

@Column(name = "INPUT_TYPE", nullable = false, length = 6, insertable = false, updatable = false) public String getInputType() { return inputType; }

回答2:

I faced the same problem:

ERROR SqlExceptionHelper:146 - The column index is out of range: 2, number of columns: 1

When I upgraded the JPA version to add the following two attributes to the discriminator column:

insertable = false and updatable = false

Earlier this was the default.

来源：https://stackoverflow.com/questions/32630548/error-when-trying-to-insert-an-extended-entity-invalid-column-index

标签

java

hibernate

jpa

observer-pattern

jpa-2.1