[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=44054#comment-44054 ] 

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

>From a sizing point of view, it appears that the following EMF data is duplicated in a clustered environment (I think).  The savings will be based from not serializing the following EMF instance variables:

	private final SessionFactory sessionFactory;  // only UUID + name is serialized
	private final PersistenceUnitTransactionType transactionType; 
	private final boolean discardOnClose;
	private final Class sessionInterceptorClass;
	private final CriteriaBuilderImpl criteriaBuilder;
	private final Metamodel metamodel;
	private final HibernatePersistenceUnitUtil util;
	private final Map<String,Object> properties;
	private final PersistenceUtilHelper.MetadataCache cache = new PersistenceUtilHelper.MetadataCache();



> 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.

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