[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2710) Cannot specify on-delete="cascade" for a map or a set with just one element

[Gerald Klopp (JIRA)]

Cannot specify on-delete="cascade" for a map or a set with just one element
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                 Key: HHH-2710
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2710
             Project: Hibernate3
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.2.4
            Reporter: Gerald Klopp
            Priority: Minor


I'd like to specify the on-delete="cascade" attribute for a map or for a set with just one element.
When I try to do this, I get the following exception :
Initial SessionFactory creation failed.org.hibernate.MappingException: only inverse one-to-many associations may use on-delete="cascade"

The on-delete="cascade" attribute can be specified for more complex relationships like one-to-many. But it seems that the case of a simple map or set is not covered.

- Mapping document example:
<hibernate-mapping>
    <class name="Document" table="DOCUMENT">
        <id name="id" column="DOCUMENT_ID">
            <generator class="native" />
        </id>

        <map name="titles" table="DOCUMENT_TITLE" lazy="false">
            <key column="DOCUMENT_ID" on-delete="cascade" />
            <index column="LANGUAGE" type="string" />
            <element column="TITLE" type="text" not-null="true" />
        </map>

        <set name="references" table="DOCUMENT_REFERENCE" lazy="false">
            <key column="DOCUMENT_ID" on-delete="cascade" />
            <element type="string" column="REFERENCE" />
        </set>
    </class>
</hibernate-mapping>


- Exception stack trace :
Initial SessionFactory creation failed.org.hibernate.MappingException: only inverse one-to-many associations may use on-delete="cascade": Document.references
Exception in thread "main" java.lang.ExceptionInInitializerError
   at fr.gklopp.test.hibernate3.util.HibernateUtil.<clinit>(HibernateUtil.java:17)
   at fr.gklopp.test.hibernate3.simple.DocumentManager.createAndStoreDocument(DocumentManager.java:23)
   at fr.gklopp.test.hibernate3.simple.DocumentManager.main(DocumentManager.java:68)
Caused by: org.hibernate.MappingException: only inverse one-to-many associations may use on-delete="cascade": fr.gklopp.test.hibernate3.simple.Document.references
   at org.hibernate.mapping.Collection.validate(Collection.java:267)
   at org.hibernate.mapping.Set.validate(Set.java:19)
   at org.hibernate.cfg.Configuration.validate(Configuration.java:1106)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)
   at fr.gklopp.test.hibernate3.util.HibernateUtil.<clinit>(HibernateUtil.java:13)
   ... 2 more


- Database : Oracle 10


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