[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1820) Lazy loading problem when property-ref is used for collections

[Jakub M. (JIRA) <no...@at...>]

Lazy loading problem when property-ref is used for collections
--------------------------------------------------------------

         Key: HHH-1820
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1820
     Project: Hibernate3
        Type: Bug

    Versions: 3.1.3    
 Environment: Oracle 8.1.7
    Reporter: Jakub Mendys


Consider mapping 

	<class name="MedDRATerm" table="MBROW_MEDDRA_TERMS" mutable="false"
		batch-size="50">
		<cache usage="read-only" region="dictionary" />
		<id name="medDRATermId" type="long" column="TERM_ID">
			<generator class="assigned" />
		</id>
		<map name="termNames" table="MBROW_TERM_NAMES" lazy="true"
			batch-size="50">
			<cache usage="read-only" region="dictionary" />
			<key column="MEDDRA_CODE" property-ref="medDRACode" />
			<index column="LANGUAGE_ID"
				type="com.roche.dss.meddra.dao.type.LanguageType" />
			<element column="NAME" type="string" />
		</map>
		<property name="medDRACode" column="MEDDRA_CODE"
			type="com.roche.dss.meddra.dao.type.MedDRACodeType" />
	</class>
	<class name="MedDRATermInstance" table="MBROW_MEDDRA_TREES"
		mutable="false">
		<cache usage="read-only" region="dictionary" />
		<id name="medDRATermInstanceId" type="long" column="NODE_ID">
			<generator class="assigned" />
		</id>
		<many-to-one name="medDRATerm" class="MedDRATerm"
			column="TERM_ID" fetch="join" not-null="true" insert="false"
			update="false" />
	</class>

When you execute a query:

from MedDRATermInstance i where i.version=:versionId and i.medDRATerm in (:terms)

and then using the _same session_ you will iterate over returned collection and will call session.get(id) for returned records it is very likely that for _SOME_ (random??) of objects when you will try to access its properties you will get following exception thrown:

2006-06-07 19:25:11,942 ERROR org.hibernate.LazyInitializationException - failed to lazily initialize a collection of role: com.roche.dss.meddra.model.MedDRATerm.termNames, no session or session was
losed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.roche.dss.meddra.model.MedDRATerm.termNames, 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.readElementByIndex(AbstractPersistentCollection.java:151)
        at org.hibernate.collection.PersistentMap.get(PersistentMap.java:127)

Calling session.clear() before session.get() helps to workaround this but causes all the records to be fethed again from the database.





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