[jira] Commented: (OPENJPA-1607) Using unidirectional one-to-many target foreign key throws exception

["Thomas O Rowe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPENJPA-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852363#action_12852363 ] 

Thomas O Rowe commented on OPENJPA-1607:
----------------------------------------

I believe a join table is required, not a join column.  The JPA 2.0 spec has an example in section 2.10.5.1 that illuminates further.

> Using unidirectional one-to-many target foreign key throws exception
> --------------------------------------------------------------------
>
>                 Key: OPENJPA-1607
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1607
>             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 2.0.

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