[hibernate-issues] [Hibernate-JIRA] Created: (ANN-725) @OneToOne: optional = true is ignored

[Adrian Moos (JIRA)]

@OneToOne: optional = true is ignored
-------------------------------------

                 Key: ANN-725
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-725
             Project: Hibernate Annotations
          Issue Type: Bug
          Components: binder
    Affects Versions: 3.3.0.ga
         Environment: hibernate 3.2.4.sp1
            Reporter: Adrian Moos
            Priority: Minor


In some entity, I map:

    @javax.persistence.OneToOne(targetEntity = InfoAutoVerrechnungImpl.class, fetch = FetchType.LAZY, //
    optional = true)
    @javax.persistence.JoinColumns(/**/{
            @javax.persistence.JoinColumn(name = "MI0153A", referencedColumnName = "MI0153A", //
            nullable = false, updatable = false, insertable = false),
            @javax.persistence.JoinColumn(name = "MI1997A", referencedColumnName = "MI1997A", //
            nullable = false, updatable = false, insertable = false) })
    public InfoAutoVerrechnung getInfoAutoVerrechnung();

The optional = true is lost during construction of hibernate's configuration metamodel, as the property is represented using a ManyToOneType (!) with ignoreNotFound == false (and hence nullable == false). Consequently, hibernate installs a proxy for the property on entity load even if the remote end of the association does not exist (whose lazy initialization fails with an ObjectNotFoundException).

Expected behavior: Hibernate should either respect the optional = true, or throw a MappingException (ideally mentioning the expected way to express nullability).

Workaround: Adding
    @NotFound(action = NotFoundAction.IGNORE)
causes hibernate to treat the property as nullable. 

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