[hibernate-issues] [Hibernate-JIRA] Created: (ANN-635) Hib doesn't share allocated sequence values between different classes

[Adam Wozniak (JIRA)]

Hib doesn't share allocated sequence values between different classes
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                 Key: ANN-635
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-635
             Project: Hibernate Annotations
          Issue Type: Improvement
    Affects Versions: 3.3.0.ga
            Reporter: Adam Wozniak
         Attachments: Zbbb.java, Zccc.java

Hello Everybody

This is my first issue here, so I don't know if my issue will be classified as a bug or an improvement only.

My config:
hibernate-3.2.4.sp1
hibernate-annotations-3.3.0.GA
hibernate-entitymanager-3.3.1.GA

I use Oracle database. I have 2 entity classes (Zbbb and Zccc).
Those 2 classes map two database table: ZBBB and ZCCC.

Both tables have identical structure:
ID - NUMBER (primary key)
TEXT - VARCHAR2(10)

Identifiers for both tables are generated by _ONE_ (the same) Oracle sequence.

For both entities I have following annotations:
	@Id
	@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "my_generator")
	@javax.persistence.SequenceGenerator(
		  name = "my_generator"
		, sequenceName = "SEQ_DEPT"
		, allocationSize=2)

Note, that allocationSize is set: 2.

When I am creating and persisting 2 Zbbb and 2 Zccc entities like this:
	{ Zccc entity = new Zccc(); em.persist(entity); } // DB HIT!
	{ Zccc entity = new Zccc(); em.persist(entity); }

	{ Zbbb entity = new Zbbb(); em.persist(entity); } // DB HIT!
	{ Zbbb entity = new Zbbb(); em.persist(entity); }
... everything is OK because I have 2 hits to database sequence only.

But when I am creating and persisting 1 Zbbb and 3 Zccc entities like this:
	{ Zbbb entity = new Zbbb(); em.persist(entity); }
	{ Zccc entity = new Zccc(); em.persist(entity); }
	{ Zccc entity = new Zccc(); em.persist(entity); }
	{ Zccc entity = new Zccc(); em.persist(entity); }
... I have 3 hits do database sequence.

I would expect, that Hibernate should recognize that Zbbb and Zccc are suing the same database sequence and should share all cached values between entities of those two classes.

Do I do something wrong?

Kind regards,
Adam Wozniak

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