[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-442) hibernate does not handle correctly covariant return types of java 1.5.

[Steve Ebersole (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Ebersole closed HHH-442.
------------------------------

    Resolution: Duplicate

> hibernate does not handle correctly covariant return types of java 1.5.
> -----------------------------------------------------------------------
>
>                 Key: HHH-442
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-442
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.0.2
>         Environment: INFO: Hibernate 3.0.2
> Windows XP Pro
> java version "1.5.0_03"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
> Java HotSpot(TM) Client VM (build 1.5.0_03-b07, mixed mode, sharing)
>            Reporter: Stefan Bühlmann
>            Priority: Minor
>         Attachments: covariant_problem.zip
>
>
> Hi Gavin,
> It seems as if hibernate does not handle correctly covariant return types of java 1.5.
> In the example included LocalWorkspace implements LocalWorkspaceI.
> The attribute visibleCommittedTrx and it's setters and getters use the type Transaction;
> But the interface LocalWorkspaceI uses TransactionI as a return type for getVisibleCommittedTrx().
> To put it the other way around, LocalWorkspace.getVisibleCommittedTrx() returns a class and not an interface, but this still implements the interface, since it is a covariant return type.
> It compiles nicely with java 1.5, but when run it get the following:
> org.hibernate.MappingException: An association from the table LOCALWORKSPACE refers to an unmapped class: x2.elements.interfaces.TransactionI
> This clearly shows, that hibernate tries to use TransactionI. But I never made a mapping for an interface!
> To use the stripped down example, just edit go.bat and set JAVA_HOME to your liking. Then run go.bat.
> But how can I upload a zip?
> Bye Stefan

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