[hibernate-issues] [Hibernate-JIRA] Created: (EJB-346) Hibernate is not JPA compliant when using multiple EAGER OneToMany relationships

[Doug Bateman (JIRA)]

Hibernate is not JPA compliant when using multiple EAGER OneToMany relationships
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                 Key: EJB-346
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-346
             Project: Hibernate Entity Manager
          Issue Type: Bug
    Affects Versions: 3.3.0.ga
            Reporter: Doug Bateman


JPA compatibility is broken when mapping a JPA object with multiple eagerly loaded one-to-many mappings.  Specifically, Hibernate's behavior is as follows:

+ If a JPA persistent object has multiple fields with "@OneToMany(fetch=FetchType.EAGER)" Hibernate throws "HibernateException: cannot simultaneously fetch multiple bags"
+ This issue is fixed only when the user adds the Hibernate specific annotation @Fetch(FetchMode.SUBSELECT)

To be JPA compliant, Hibernate must be able to map any JPA compliant object, without requiring additional Hibernate specific annotations.  JPA expressly allows multiple one-to-many mappings (with the implied assumption that subselects are used by default in this case).

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