[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-6162) SessionFactory in QueryKey

[Pawel Omelko (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-6162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43684#comment-43684 ] 

Pawel Omelko commented on HHH-6162:
-----------------------------------

Hi Julian,

Just name your sessionFactory using hibernate.session_factory_name property. When you do that, your SF instance will be added to NAMED_INSTANCES hashMap, in every clusters node. So when cache will be replicated and deserialized in another node, SF won't be deserialized but taken from NAMED_INSTANCES map. It's working.

> SessionFactory in QueryKey
> --------------------------
>
>                 Key: HHH-6162
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6162
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.6.2, 4.0.0.Alpha1, 3.6.3, 4.0.0.Alpha2
>         Environment: Hibernate 3.6.2, Postgresql 8.3 
>            Reporter: Pawel Omelko
>
> I guess that after improvement HHH-5138, a ManyToOneType.java (and many other types) has reference to SessionFactory (by TypeFactory.TypeScope scope field). And now QueryKey, which contains Type[] positionalParameterTypes field, contains also SessionFactory - eg. ManyToOneType. So now we can find SessionFactory in QueryCache elements, which unnecessarily increase memory usage. There is another problem when cache replication is used (ehcache via RMI), I've got an exception during SessionFactory deserialization in receiver node:
> Apr 27 06:17:58 WARN net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator:320  - Unable to send message to remote peer.  Message was: null
> Apr 27 06:17:58 java.lang.NullPointerException
> Apr 27 06:17:58 at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> Apr 27 06:17:58 at org.hibernate.impl.SessionFactoryObjectFactory.getNamedInstance(SessionFactoryObjectFactory.java:159)
> Apr 27 06:17:58 at org.hibernate.impl.SessionFactoryImpl.readResolve(SessionFactoryImpl.java:753)
> Apr 27 06:17:58 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> Apr 27 06:17:58 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> Apr 27 06:17:58 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> Apr 27 06:17:58 at java.lang.reflect.Method.invoke(Method.java:597)
> Apr 27 06:17:58 at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1061)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1762)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
> Apr 27 06:17:58 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
> Apr 27 06:17:58 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
> Apr 27 06:17:58 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
> Apr 27 06:17:58 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
> Apr 27 06:17:58 at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:480)
> Apr 27 06:17:58 at org.hibernate.cache.QueryKey.readObject(QueryKey.java:192)

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