[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-572) Repeated columns rejected in a collection of composite elements
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http://opensource.atlassian.com/projects/hibernate/browse/HHH-572?page=co...
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michael harris commented on HHH-572:
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Yes this is an issue for me as well. It seems there is no support for a one to many join
with shared composite key elements, and with this bug, I can't map the join table as a
composite element. The lifecycle semantics would be nice here. My only option is to map
a one-to-many on an entity for the join table, and then a unique many-to-many on the join
table to the child. which is a pain.
I feel this is an important issue. I feel having an entity that can be attached to any
number of parents with shared composite keys is not that exotic of a use case. Support
for this would save a bunch of time.
Repeated columns rejected in a collection of composite elements
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Key: HHH-572
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-572
Project: Hibernate Core
Issue Type: Bug
Affects Versions: 3.0.5
Environment: JRE 1.4.2_08
Reporter: Emmanuel Bourg
Assignee: Gavin King
Priority: Minor
Repeating a column in a collection of composite elements triggers an error when the
mapping is parsed, even if the property with the repeated column has the insert and update
attributes set to false:
<set name="children" table="CHILDREN">
<key column="PARENT_ID"/>
<composite-element class="Child">
<property name="parentId" column="PARENT_ID"
insert="false" update="false" />
</composite-element>
</set>
or
<set name="roles" table="ROLE">
<key column="PARENT_ID"/>
<composite-element class="Role">
<many-to-one name="child" class="Child"/>
<property name="childId" column="CHILD_ID"
insert="false" update="false" />
</composite-element>
</set>
Hibernate throws this exception:
org.hibernate.MappingException: Repeated column in mapping for collection:
Parent.children column: PARENT_ID
at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:275)
at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:298)
at org.hibernate.mapping.Collection.validate(Collection.java:255)
at org.hibernate.mapping.Set.validate(Set.java:19)
at org.hibernate.cfg.Configuration.validate(Configuration.java:817)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:976)
a workaround is to use a formula:
<set name="children" table="CHILDREN">
<key column="PARENT_ID"/>
<composite-element class="Child">
<property name="parentId" formula="PARENT_ID"/>
</composite-element>
</set>
This works fine with the fix for HHH-539
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