[Hibernate-issues] [Hibernate-JIRA] Created: (ANN-379) Map<Entity, Entity> fails due to unique constraint on map-key column

[Benjamin B. (JIRA) <no...@at...>]

 Map<Entity, Entity> fails due to unique constraint on map-key column
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         Key: ANN-379
         URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-379
     Project: Hibernate Annotations
        Type: Bug

  Components: binder  
    Versions: 3.2.0.cr1    
 Environment: hibernate-3.2.0.CR2, hibernate-annotations-3.2.0.CR1, jdk-1.5.0_07
    Reporter: Benjamin Bentmann
 Attachments: IndexedCollectionTest.java

The current DDL statements for a true Map<Entity, Entity> produce a unique constraint on the map-key column. This effectively prevents multiple entities (hosting such a Map) from using the same map key.

I tracked the problem down to org.hibernate.cfg.annotations.MapBinder and its method bindKeyFromAssociationTable, line 225. In case of an entity as the map-key, the code always sets the unique flag for the join-column...

Attached is a slightly modified version of your own test case IndexedCollectionTest to reproduce the problem. The only change I made is located in the method testRealMap, adding just another Atmosphere with the same GasKey.

For a more verbose problem description you might want to have a look at:
http://forum.hibernate.org/viewtopic.php?t=961102

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