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https://issues.apache.org/jira/browse/ARIES-2050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Baptiste Onofré resolved ARIES-2050.
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Resolution: Fixed
> Aries JPA 2.7 shouldn't always reuse EM instance from previous coordinations
> ----------------------------------------------------------------------------
>
> Key: ARIES-2050
> URL: https://issues.apache.org/jira/browse/ARIES-2050
> Project: Aries
> Issue Type: Bug
> Components: JPA
> Affects Versions: jpa-2.7.2
> Reporter: Grzegorz Grzybek
> Assignee: Grzegorz Grzybek
> Priority: Major
> Fix For: jpa-2.7.3
>
>
> I have a scenario consisting of the following call graph:
> {noformat}
> testService.performTest() [ @Transactional(TxType.REQUIRED) ]
> +-- List<Car> cars = carDao.getAllCars()
> | +-- return em.createQuery("select c from Car c",
> Car.class).getResultList()
> | (em is injected using @PersistenceContext(unitName = "xa-test-unit"))
> |
> +-- carDao.createNew(car);
> | +-- em.persist(car);
> |
> +-- newTxTestService.testNewTransaction(transactionManager.getTransaction())
> [ @Transactional(TxType.REQUIRES_NEW) ]
> +-- List<Car> cars = carDao.getAllCars();
> +-- return em.createQuery("select c from Car c",
> Car.class).getResultList()
> {noformat}
> The problem is that inside the method marked with
> {{@Transactional(TxType.REQUIRES_NEW)}} the {{em}} proxy uses the same
> underlying {{em}} instance because of:
> {code:java}
> Coordination getTopCoordination() {
> Coordination coordination = coordinator.peek();
> while (coordination != null && coordination.getEnclosingCoordination() !=
> null) {
> coordination = coordination.getEnclosingCoordination();
> }
> return coordination;
> }
> {code}
> And even if the suspended transaction is not yet committed, the em returns
> the persisted (but not yet committed) cars.
> The coordination stack consists of (names of coordination objects):
> *
> txInterceptor.org.apache.aries.jpa.container.itest.bundle.blueprint.impl.TestServiceImpl.performTest
> *
> txInterceptor.org.apache.aries.jpa.container.itest.bundle.blueprint.impl.NewTxTestServiceImpl.testNewTransaction
> * jpa
> the top coordination contains {{em}} variable associated with suspended
> transaction.
> I'm working on a solution that properly assigns _current_ em respecting
> tx-demarcated coordinations.
> [~cschneider], [~gnodet], [~jbonofre] if you have an idea about the best
> solution, please share.
> For now I think both aries-jpa and aries-blueprint-transaction have to be
> fixed (the latter one should put some magical variable to the coordination
> objects pushed inside {{org.apache.aries.transaction.TxInterceptorImpl}})
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