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http://opensource.atlassian.com/projects/hibernate/browse/HHH-2807?page=c...
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Max Rydahl Andersen closed HHH-2807.
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    Resolution: Incomplete
use <collection-cache collection="SubClass.myCollection"
region="xxx" usage="transactional"/>
casing matters.
if you still got an error then submit a *working* testcase.
 Impossible to define caching for a subclass's collection in
hibernate.cgf.xml 
 ------------------------------------------------------------------------------
                 Key: HHH-2807
                 URL: 
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2807
             Project: Hibernate3
          Issue Type: Bug
          Components: caching (L2)
    Affects Versions: 3.2.5
         Environment: Hibernate 3.2.5
 Sybase
            Reporter: Sebastien Blind
 Basically, hibernate allows to define <cache usage="transactional"/>
inside the subclass mapping, i.e.
 <subclass name="SubClass" extends="BaseClass"
discriminator-value="xxx">
         <bag name="subClassLinks" lazy="false"
inverse="true" batch-size="100">
             <cache usage="transactional" region="xxx"/>
     		<key column="xxx" not-null="true"/>
     		<one-to-many class="xxx"/>
         </bag>    
     
         <join table="xxx">
         </join>
 </subclass>
 but it's not allowed to do the same using <collection-cache
collection="subClass.myCollection" region="xxx"
usage="transactional"/>.
 It throws:
 Exception in thread "main" org.hibernate.MappingException: Cannot cache an
unknown collection: subClass.myCollection
 	at
org.hibernate.cfg.Configuration.setCollectionCacheConcurrencyStrategy(Configuration.java:1984)
 	at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1568)
 	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1534)
 	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1508)
 	at org.hibernate.cfg.Configuration.configure(Configuration.java:1428) 
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