[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6725) Bidirectional @OneToOne(optional=true) with a foreign ID generator should force optional=false

[Gail Badner (JIRA)]

Bidirectional @OneToOne(optional=true) with a foreign ID generator should force optional=false
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                 Key: HHH-6725
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6725
             Project: Hibernate Core
          Issue Type: Improvement
            Reporter: Gail Badner
            Assignee: Gail Badner
             Fix For: 4.0.0.next


When a foreign ID generator is used with @OneToOne(optional=true), Hibernate should:
- force optional=false
- log a warning

The default for @OneToOne is optional=true

This should be done when a foreign ID generator is used 
- with @OneToOne @PrimaryKeyJoinColumn
- with @OneToOne(mappedBy="...")

Currently, Hibernate allows the one-to-one association to be optional, but if the association is set to null, IdentifierGenerationException is thrown. 

I don't think it's possible to check for a ForeignGenerator until the SessionFactory or persister is being built with a Configuration object.

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