openjpa-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jacek Laskowski (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-197) @Version property doesn't ensure integrity when performing the merge operation
Date Mon, 02 Apr 2007 20:08:32 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486112
] 

Jacek Laskowski commented on OPENJPA-197:
-----------------------------------------

Please close the issue with WON'T FIX or alike due to the section in JPA spec - 3.4.2 Version
Attributes page 55:

The persistence provider's implementation of the merge operation must examine the version
attribute when an entity is being merged and throw an OptimisticLockException if it is discovered
that
the object being merged is a stale copy of the entity—i.e. that the entity has been updated
since the entity became detached. Depending on the implementation strategy used, it is possible
that this exception may not be thrown until flush is called or commit time, whichever happens
first.

The relevant part is the last sentence. Sorry for bothering.

> @Version property doesn't ensure integrity when performing the merge operation
> ------------------------------------------------------------------------------
>
>                 Key: OPENJPA-197
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-197
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>    Affects Versions: 0.9.7
>            Reporter: Jacek Laskowski
>
> See the simple test case:
>         {
>             Query query = em.createQuery("SELECT o FROM Osoba o WHERE o.imie = 'Jacek'
AND o.nazwisko = 'Laskowski'");
>             final Osoba osoba = (Osoba) query.getSingleResult();
>             final Long numerOsoby = osoba.getNumer(); // numer is the pk
>             long wersja = osoba.getWersja(); // wersja is a versioned property
>             {
>                 EntityTransaction tx = em.getTransaction();
>                 tx.begin();
>                 Osoba osobaWersja0 = em.find(Osoba.class, numerOsoby);
>                 assert osobaWersja0.getWersja() == wersja;
>                 osobaWersja0.setImie("change");
>                 em.flush();
>                 wersja++;
>                 assert osobaWersja0.getWersja() == wersja;
>                 tx.commit();
>                 assert osobaWersja0.getWersja() == wersja;
>                 em.refresh(osobaWersja0);
>                 assert osobaWersja0.getWersja() == wersja;
>             }
>             {
>                 em.clear(); // osoba is now detached
>                 final String noweImie = "Yet another name change";
>                 osoba.setImie(noweImie);
>                 EntityTransaction tx = em.getTransaction();
>                 tx.begin();
>                 Osoba osobaWersja1 = em.find(Osoba.class, numerOsoby);
>                 osobaWersja1.setImie("and another");
>                 tx.commit(); // change is on its way to database
>                 wersja++;
>                 assert osobaWersja1.getWersja() == wersja;
>                 assert osobaWersja1.getWersja() != osoba.getWersja();
>                 if (em.getClass().getCanonicalName().equals("org.apache.openjpa.persistence.EntityManagerImpl"))
{
>                     Osoba osobaPoMerge = em.merge(osoba);
>                     assert osobaPoMerge.getImie().equals(osoba.getImie());
>                     assert osobaPoMerge.getImie().equals(noweImie);
>                     em.getTransaction().begin();
>                     try {
>                         em.flush();
>                         assert false;
>                     } catch (/* OptimisticLock */Exception oczekiwano) {
>                         em.getTransaction().rollback();
>                     }
>                 }
>             }
>         }
> It works fine with Apache OpenJPA 0.9.7-SNAPSHOT with the sources on the past Friday.
Hibernate EntityManager 3.3.1 and TopLink Essentials 2.0 BUILD 40 throw exception as the detached
entity is merged  to em. According to the spec 9.1.17 Version Annotation p. 178 (and the javadoc
- http://java.sun.com/javaee/5/docs/api/javax/persistence/Version.html - too):
> The Version annotation specifies the version field or property of an entity class that
serves as its optimistic lock value. The version is used to ensure integrity when performing
the merge operation and for optimistic concurrency control.
> So, I think that it's a bug in OpenJPA.
> BTW, I'm still unable to send emails to open-jpa-dev. Who should I contact to in order
to fix it?

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message