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Date: Thu, 16 Dec 2010 16:17:00 -0500 (EST)
From: "Jeremy Bauer (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Commented: (OPENJPA-1607) Using unidirectional one-to-many
 target foreign key throws exception
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    [ https://issues.apache.org/jira/browse/OPENJPA-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972211#action_12972211 ] 

Jeremy Bauer commented on OPENJPA-1607:
---------------------------------------

IIRC, the reason this new behavior wasn't simply enabled in OpenJPA 2.x.x, regardless of persistence version, is that it caused issues when running some JPA 1.0 TCK variations.  With the exception of the API signature tests, we made it a priority to make sure all of the 1.0 variations passed with 2.x.x level code to help ensure backward compatibility.

> 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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