[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3540) Dynamic model to fetch data (getting Exception when using Set with fetch="join").

[Prosenjit Chakraborty (JIRA)]

Dynamic model to fetch data (getting Exception when using Set with fetch="join").
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                 Key: HHH-3540
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3540
             Project: Hibernate Core
          Issue Type: Bug
    Affects Versions: 3.3.1
         Environment: hibernate-distribution-3.3.1.GA
            Reporter: Prosenjit Chakraborty
         Attachments: entity.hbm.xml

I am using dynamic model to fetch data.
entity.hbm.xml:
============
<hibernate-mapping default-lazy="false">
	<class entity-name="en_table1" table="table1">
		<id name="tab_id1" column="tab_id1" type="integer"/>
		<property name="tab_name1" column="tab_name1" type="string" />		       
		<set name="en_table2s" fetch="join" lazy="false">
		  <key column="tab_id1"/>
		  <one-to-many class="en_table2"/>
		</set>		
	</class>
	<class entity-name="en_table2" table="table2">
		<id name="tab_id2" column="tab_id2" type="integer"/>
		<property name="tab_name2" column="tab_name2" type="string" />              
		<set name="en_table3s" fetch="join" lazy="false">
		  <key column="tab_id2"/>
		  <one-to-many class="en_table3"/>
		</set>
	</class>
	<class entity-name="en_table3" table="table3">
		<id name="tab_id3" column="tab_id3" type="integer"/>
		<property name="tab_name3" column="tab_name3" type="string" />              
	</class>
</hibernate-mapping>

Data Access Code:
================
Object o=session.get("en_table1",1);

Getting error: 
================
org.hibernate.LazyInitializationException: illegal access to loading collection
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:363)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
	at org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:434)
	at java.util.HashMap$Entry.hashCode(Unknown Source)
	at java.util.AbstractMap.hashCode(Unknown Source)
	at java.util.HashMap.put(Unknown Source)
	at java.util.HashSet.add(Unknown Source)...........

#####
The problem arises from the second level Set (here, 'set name="en_table3s"' ). For first level set  only('set name="en_table2s"') the problem doesn't arise.
Though can be solved by: 
<set name="en_table3s" fetch="select" lazy="false">. But, I have to use fetch="join".
So, what should I do now? Please help.

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