[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5751) MappingException: using @Column in Embedded ID classes fail when also used in an @JoinColumn in the entity class

[Karsten Wutzke (JIRA)]

MappingException: using @Column in Embedded ID classes fail when also used in an @JoinColumn in the entity class
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                 Key: HHH-5751
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5751
             Project: Hibernate Core
          Issue Type: Bug
          Components: annotations, core, metamodel
    Affects Versions: 3.6.0
         Environment: Hibernate 3.6, JavaSE, HSQLDB, Ant
            Reporter: Karsten Wutzke
            Priority: Critical
         Attachments: zips-hib-embeddedid-column-broken.zip

Here's the DB design (DDL):

CREATE TABLE Countries
(
  iso_code CHAR(2) NOT NULL,
  name VARCHAR(50) NOT NULL,
  PRIMARY KEY (iso_code)
);

CREATE TABLE Zips
(
  country_code CHAR(2) NOT NULL,
  code VARCHAR(10) NOT NULL,
  PRIMARY KEY (country_code, code),
  FOREIGN KEY (country_code) REFERENCES Countries (iso_code)
);

Here's the Zip class + composite primary key class:

@Entity
@Table(name = "Zips")
public class Zip implements Serializable
{
    @EmbeddedId
    private ZipId embeddedId;

    @ManyToOne
    @JoinColumn(name = "country_code", referencedColumnName = "iso_code")
    private Country country = null;

    ...
}

@Embeddable
public class ZipId implements Serializable
{
    @Column(name = "country_code", insertable = false, updatable = false)
    private String countryCode;

    @Column(name = "code")
    private String code;

    ...
}

Hibernate stack trace:

Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: zips] Unable to build EntityManagerFactory
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:911)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:57)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
    at tld.zips.Main.main(Main.java:27)
Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: tld.zips.model.Zip column: country_code (should be mapped with insert="false" update="false")
    at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:675)
    at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:697)
    at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:719)
    at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:473)
    at org.hibernate.mapping.RootClass.validate(RootClass.java:235)
    at org.hibernate.cfg.Configuration.validate(Configuration.java:1332)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1835)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:902)
    ... 4 more

The problem here is the @Column on the @Embeddable composite primary key class. country_code is mapped as read-only (insertable = false, updatable = false) in the composite primary key class. The above syntax is JPA-compatible. Clearly, there's no other clean way where to put the @Column annotations but into the @Embeddable class. It's incomprehensible why this doesn't work. @Embeddable classes allow @Basic, @Column, @Enumerated, @Temporal, @Lob, and @Embedded on its columns, so this should work.

The exception vanishes when putting the insertable = false, updatable = false on the @JoinColumn, but this is not what I want. I prefer my associations to be writable...

The above syntax works perfectly with EclipseLink!

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