Question

I am running in-container tests with arquillian. I am prepopulating the database by adding an import.sql to the deployment. During the test I would like to create some more entities.

Unfortunately, this fails with a PersistenceException:

javax.persistence.PersistenceException:
org.hibernate.exception.ConstraintViolationException: Unique index or
primary key violation: “PRIMARY_KEY_BE ON
PUBLIC.KVS_MIPO_DOWNLOAD(ID)”

If I do not prepopulate the DB, or do not persist new entities, everything runs smoothly.

The id is the only unique field, so I strongly suspect that it must be the id generation using a sequence.

@Entity
@Table(name = "KVS_MIPO_DOWNLOAD")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.STRING)
public abstract class DownloadResource implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Integer id;

This entity is the superclass of another concrete entity, which does not add any unique attributes.

What can be done to be able to accomodate both possibilitiees – inserting manually and using a generated id?

Thank you

I am working with JPA 2 over Hibernate 4.0.1 in JBoss 7.1.1. The database is Sybase ASE 15.

EDIT: one workaround I have found so far is to set the Ids of the manually added entities high enough to avoid collisions. But this is not good enough for production – too many employees have write access to the db and may be tempted to add stuff manually. I would prefer the application to be robust enough not to die and explode in this case.

Answer 1

Use negative values for your manual ids. Hibernate shouldn’t generate negative ones.

Optionally, use your own id generator that skips a particular range (or skips say numbers divisible by 7; some such scheme).

Sample ID generator:

import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.id.IdentifierGenerator;

public class MyGenerator implements IdentifierGenerator {

    public Serializable generate(SessionImplementor session, Object object)
            throws HibernateException {
        return 1; // TODO: Your scheme to create an Integer;
    }
}

To use this annotate as follows:

@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "myid")
@GenericGenerator(name = "myid", strategy = "com.x.y.z.MyDGenerator")
public int getId() {
    return _id;
}