Re: [eclipselink-users] Order of persist operations

2:57:58,867 TRACE TypeFactory:72 - Scoping types to session factory org.hibernate.internal.SessionFactoryImpl@395fa2b5

Hibernate: insert into ROLE (ID) values (?)

12:57:59,365 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST0

Hibernate: insert into ROLE (ID) values (?)

12:57:59,369 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST1

Hibernate: insert into ROLE (ID) values (?)

12:57:59,371 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST2

Hibernate: insert into ROLE (ID) values (?)

12:57:59,372 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST3

Hibernate: insert into ROLE (ID) values (?)

12:57:59,373 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST4

Hibernate: insert into ROLE (ID) values (?)

12:57:59,375 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST5

Hibernate: insert into ROLE (ID) values (?)

12:57:59,376 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST6

Hibernate: insert into ROLE (ID) values (?)

12:57:59,377 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST7

Hibernate: insert into ROLE (ID) values (?)

12:57:59,378 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST8

Hibernate: insert into ROLE (ID) values (?)

12:57:59,380 TRACE BasicBinder:83 - binding parameter [1] as [VARCHAR] - TEST9

On Jan 17, 2013, at 12:19 , Deyan Tsvetanov <deyan@xxxxxxxxxxxx> wrote:

Hi guys,

I am experiencing a weird imho behaviour of Eclipselink and I'd really like to hear some other opinions .

I have a pretty simple entity with assigned IDs;

@Entity @Table(name="ROLE")

public class Role implements Serializable {

	private static final long serialVersionUID = 1L;

	@Id @Column(name="ID", length=20, nullable=false)

    public String id;

}

I am executing the following operations:

public static void main(String[] args) {

		EntityManagerFactory emf = Persistence.createEntityManagerFactory("EclipseLinkJPATest");

		EntityManager em = emf.createEntityManager();

		em.getTransaction().begin();

		for (int i = 0; i < 10; i++) {

			Role r = new Role();

			r.id = "TEST" + i;

			em.persist(r);

}

		em.getTransaction().commit();

		em.close();

		emf.close();

}

And I'd expect that the INSERT queries will be executed in the same order as the persist() method is called: 

TEST0, TEST1, TEST2 , etc.

But in the real life the insert queries are in a random order every time: 

EL Fine]: sql: 2013-01-17 12:13:58.11--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST1]
[EL Fine]: sql: 2013-01-17 12:13:58.113--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST6]
[EL Fine]: sql: 2013-01-17 12:13:58.114--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST2]
[EL Fine]: sql: 2013-01-17 12:13:58.115--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST7]
[EL Fine]: sql: 2013-01-17 12:13:58.117--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST4]
[EL Fine]: sql: 2013-01-17 12:13:58.121--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST8]
[EL Fine]: sql: 2013-01-17 12:13:58.123--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST3]
[EL Fine]: sql: 2013-01-17 12:13:58.124--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST9]
[EL Fine]: sql: 2013-01-17 12:13:58.126--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST5]
[EL Fine]: sql: 2013-01-17 12:13:58.127--ClientSession(1694665796)--Connection(1795160456)--INSERT INTO ROLE (ID) VALUES (?)
	bind => [TEST0]

As you can see the order if insert queries is: 

TEST1, TEST6, TEST2, TEST7, TEST4, etc. 

That is really weird and wrong ! :) 

I dug a lot and could not find a solution. 

Please help :)

Thanks in advance,

Deyan 