[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-6727) serializing an EntityManager should include enough information to later be unserialized with re-association to existing EntityManagerFactory (even on a different machine/jvm process)

[Scott Marlow (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-6727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44053#comment-44053 ] 

Scott Marlow commented on HHH-6727:
-----------------------------------

>From looking at the "EntityManagerFactoryImpl entityManagerFactory" instance variable in class EntityManagerFactoryImpl, it would appear that the serializing the EntityManager, would include the EntityManagerFactory.  

Looking at in class EntityManagerFactoryImpl, a SessionFactory (SessionFactoryImpl) instance is referenced.  When the SessionFactoryImpl is serialized, only the UUID + JNDI name of SF (if configured) is serialized.  The cache and other heavy instance variables are not serialized. :)

The puzzling part of this for me is what happens currently in a clustered environment, where the same application SF on different machines, would have different UUIDs (and possibly no JNDI name for the SF).  We must be requiring the SF JNDI name to be set, to cover that case.  That would seem to be a good workaround.  

I look forward to seeing the clustering of the extended persistence context (EntityManager) in action, so we can go by facts, not just Scott's review of current code. ;)


> serializing an EntityManager should include enough information to later be unserialized with re-association to existing EntityManagerFactory (even on a different machine/jvm process)
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-6727
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6727
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: entity-manager
>            Reporter: Scott Marlow
>             Fix For: 4.0.0.next
>
>
> The re-association (of EM to EMF) is important, as applications expect that closing the EntityManagerFactory, will close the EntityManager's that have been opened from the EMF.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira