[hibernate-issues] [Hibernate-JIRA] Created: (HHH-7045) Entity as Map Key and hashCode

[Robert Hollencamp (JIRA)]

Entity as Map Key and hashCode
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                 Key: HHH-7045
                 URL: https://hibernate.onjira.com/browse/HHH-7045
             Project: Hibernate ORM
          Issue Type: Bug
          Components: entity-manager
    Affects Versions: 3.6.10, 4.0.1
         Environment: Tested 4.0.X, 3.6.X; tested PostgreSQL and Hypersonic
            Reporter: Robert Hollencamp
         Attachments: jpa-map-work.zip

I have an entity that has a unique field; this is used as the business key. The equals and hashCode methods of the entity class use this field.

When this entity is used as the key for a map, this unique field is not loaded when the map entry is inserted; this causes hashCode to return 0 ("return field != null ? field.hashCode() : 0;") and equals to return true, so no matter how many entries there are only one will be inserted.

If I prime the cache first by loading all of these key entities, it will then work. The attached test case demonstrates this.

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