[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2183) org.hibernate.LazyInitializationException: failed to lazily initialize a collection while using lazy set with key as property-ref in the mapping

[Artur Jonak (JIRA)]

org.hibernate.LazyInitializationException: failed to lazily initialize a collection while using lazy set with key as property-ref in the mapping
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         Key: HHH-2183
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2183
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.1.3    
 Environment: Oracle 9i
    Reporter: Artur Jonak
    Priority: Blocker
 Attachments: hibernate-testcase.zip

I have an entity which can have multiple titles located in a separate table. I mapped this as a set where key attribute references other property of the entity:

<set name="titles" table="TTitle" cascade="none" lazy="true" inverse="true" mutable="false">
			<key column="ID" property-ref="parentId"/>
			<!--key column="ID"/-->
			<element type="string" column="title"/>
		</set>

when I try to display this set I get an exception: 
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: test.lazysetinit.Record.titles, no session or session was closed
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
...

The entire mapping is as follows:
	<class name="Record" table="TRecord" mutable="false">
		<id name="id" type="long">
			<column name="ID" sql-type="number" length="12" not-null="true" unique="true"/>
		</id>
		<set name="titles" table="TTitle" cascade="none" lazy="true" inverse="true" mutable="false">
			<key column="ID" property-ref="parentId"/>
			<!--key column="ID"/-->
			<element type="string" column="title"/>
		</set>
		<join table="TRecordInfo" inverse="true" fetch="join" optional="false">
			<key column="ID"/>
			<property name="parentId" not-null="false" />
			<property name="status" />
		</join>
	</class>

Attached the test case: test.lazysetinit.LazySetInitTest. DB schema is located in test/conf/lazysetinit/schema.sql

Regards,
Artur

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