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From "Kevin Sutter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-1607) Using unidirectional one-to-many target foreign key throws exception
Date Tue, 23 Jul 2013 16:56:51 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13716596#comment-13716596
] 

Kevin Sutter commented on OPENJPA-1607:
---------------------------------------

Unfortunately, this still seems to be an issue.  I just talked with a customer that is experiencing
the same type of ArgumentException when using the @JoinColumn with a @OneToMany.  They are
using a 2.0 persistence.xml and they have the related entities defined in <class> elements
in their persistence.xml.  Since we do have testcases that supposedly test this condition,
there must be some other aspect of the scenario that is alluding us.  I have not been able
to reproduce the issue myself with a junit, but I have seen the output from this customer's
system.

They have a simple mapping like this:

@Entity
@Table(name="xbo")
public class Company implements CodedEntity, Presentable {
	 	
	@OneToMany(fetch = FetchType.LAZY)
	@JoinColumn(name="bol", referencedColumnName="bol")
	private List<CompanyText> texts;

And, the resulting stacktrace is similar to what's been reported here and in openjpa-1253:

Exception in thread "main" <openjpa-2.2.1-r422266:1396819 fatal user error> org.apache.openjpa.persistence.ArgumentException:
You have supplied columns for "mycom.domain.Company.companyTexts", but this mapping cannot
have columns in this context. 
        at org.apache.openjpa.jdbc.meta.MappingInfo.assertNoSchemaComponents(MappingInfo.java:382)

        :

This seems to be a real issue that needs resolution.


                
> 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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