Hibernate adds DiscriminatorColumn to an entity with no inheritance

Hibernate ORM
1

We’re trying to upgrade one of our applications, but run into a problem with Spring JPA.

This is our entity:

@Entity
@Table(name="R001_COUNTRY")
public class Country implements Serializable, Comparable<Country> {
  @Id
  @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="R001_SEQ")
  @SequenceGenerator(name="R001_SEQ", allocationSize = 1, initialValue = 50001)
  @Column(name="COUNTRY_ID")
  private long id;
  @Column(name="COUNTRYNAME")
  private String countryName;

  // no-args constructor, getters and setters
}

We use Spring’s repositories

@Repository
public interface CountryRepository extends CrudRepository<Country, Long> {

    public Country findByCountryName(String name);
    public Country findById(long id);
    @Override
    public List<Country> findAll();
}

But deployment fails. After turning debug level up to TRACE, I get the following lines just before it crashes:

2025-02-13 11:39:59.602 DEBUG  [EntityBinder] (EntityBinder.java:209) - Binding entity from annotated class: com.kobolde.rmm.jar.generic.Country
2025-02-13 11:39:59.620 DEBUG  [EntityBinder] (EntityBinder.java:1244) - Import with entity name Country
2025-02-13 11:39:59.620 TRACE  [InFlightMetadataCollectorImpl] (InFlightMetadataCollectorImpl.java:874) - Import: Country -> com.kobolde.rmm.jar.generic.Country
2025-02-13 11:39:59.620 TRACE  [InFlightMetadataCollectorImpl] (InFlightMetadataCollectorImpl.java:874) - Import: com.kobolde.rmm.jar.generic.Country -> com.kobolde.rmm.jar.generic.Country
2025-02-13 11:39:59.623 TRACE  [NormalizingIdentifierHelperImpl] (NormalizingIdentifierHelperImpl.java:62) - Normalizing identifier quoting [R001_COUNTRY]
2025-02-13 11:39:59.626 TRACE  [NormalizingIdentifierHelperImpl] (NormalizingIdentifierHelperImpl.java:62) - Normalizing identifier quoting [R001_COUNTRY]
2025-02-13 11:39:59.630 DEBUG  [EntityBinder] (EntityBinder.java:1793) - Bind entity com.kobolde.rmm.jar.generic.Country on table r001_country
2025-02-13 11:39:59.646 TRACE  [NormalizingIdentifierHelperImpl] (NormalizingIdentifierHelperImpl.java:62) - Normalizing identifier quoting [DTYPE]
2025-02-13 11:39:59.646 DEBUG  [AnnotatedColumn] (AnnotatedColumn.java:261) - Binding column: AnnotatedDiscriminatorColumn(column='DTYPE')
2025-02-13 11:39:59.657 DEBUG  [ServiceBinding] (ServiceBinding.java:70) - Overriding existing service binding [org.hibernate.engine.jdbc.connections.spi.ConnectionProvider]
2025-02-13 11:39:59.657  WARN  [AnnotationConfigServletWebServerApplicationContext] (AbstractApplicationContext.java:624) - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unknown access type record

We use Spring-boot-parent 3.2.0 to manage versions and it has chosen hibernate-core 6.3.1 and jakarta.persistance-api 3.1.0. We also have hibernate-commons-annotations 6.0.6.

Tomcat 10.1.35 and Java21.

I’ve saved the full log, but can’t find the “attach file” option.

2

Well, riddle me this. If I remove Serializable from the list of interfaces, it works fine …

If time allows I’ll make a bug report with test case package, but in the meantime I’m very interested in what is going on behind the scenes here. There are two other small classes with similar definitions, but they are no problem even though they still implement Serializable.

3

This is a forum for Hibernate ORM questions. Please ask your Spring related questions in the Spring forums.

4

Yes, sorry for being unclear. I wanted to provide as much context as possible. The entity is being managed by Spring’s injected EntityManager, but ad far as I can see it is rooted in Hibernate inserting a DiscriminatorColumn in an entity class without any inheritance, and then incorrectly assuming my class is a record.

Yahoo Mail – E-post på ett enklare sätt

5

Note that Hibernate ORM 6.3 is not supported anymore. Please update to the latest version i.e. 6.6 first. If you think there is a bug in Hibernate ORM, then please try to create a reproducer with our test case template and if you are able to reproduce the issue, create a bug ticket in our issue tracker and attach that reproducer.

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