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From "Oliver Ringel (JIRA)" <>
Subject [jira] Commented: (OPENJPA-1607) Using unidirectional one-to-many target foreign key throws exception
Date Thu, 01 Apr 2010 14:16:27 GMT


Oliver Ringel commented on OPENJPA-1607:

Hi Thomas,

sorry, but I have to disagree. Using a jointable ist default behaviour if you not use @JoinColumn,

but the JPA 2.0 spec also supports unidirectional one-to-many relationships without the need
of jointables.
See section 11.1.21 JoinColumn Annotation of the JPA 2.0 spec.

The RI supports this kind of relationships.

> Using unidirectional one-to-many target foreign key throws exception
> --------------------------------------------------------------------
>                 Key: OPENJPA-1607
>                 URL:
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 2.0.0-beta3
>            Reporter: Oliver Ringel
>         Attachments: openjpa-1607.tar
> Using this simple unidirectional relationship
> @OneToMany
> @JoinColumn(name = "DEPARTMENT_ID")
> private Set<Employee> employees;
> causes to the following exception
> <openjpa-2.0.0-beta3-r422266:926797 fatal user error> org.apache.openjpa.persistence.ArgumentException:
You have supplied columns for "com.example.Department.employees", but this mapping cannot
have columns in this context.
> Unidirectional one-to-many target foreign key relationship should be supported in JPA

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