[jboss-jira] [JBoss JIRA] (JBJCA-1357) TransactionSynchronizer registered as interposed synchronization leads to ordering issue when using hibernate

[Scott Marlow (JIRA)]

    [ https://issues.jboss.org/browse/JBJCA-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482527#comment-13482527 ] 

Scott Marlow commented on JBJCA-1357:
-------------------------------------

If JCA used Transaction.registerSynch, then at beforeCompletion time, JCA would delist XAResource's from the JTA transaction, before JPA has written to the database, since Transaction.registerSynch registered synchronizations are run first (at beforeCompletion time).

The other reason for JCA to use interposed synchronizations, is separation of system level components from application level components, as mentioned in [https://docs.oracle.com/javaee/7/api/javax/transaction/TransactionSynchronizationRegistry.html].  

> TransactionSynchronizer registered as interposed synchronization leads to ordering issue when using hibernate
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: JBJCA-1357
>                 URL: https://issues.jboss.org/browse/JBJCA-1357
>             Project: IronJacamar
>          Issue Type: Bug
>    Affects Versions: 1.4.5
>            Reporter: Alexander Pinske
>         Attachments: jca-hibernate.zip
>
>
> The TransactionSynchronizer (to cleanup connections) is registered as an interposed synchronization. Hibernate also registers its synchronization (to close the underlying JDBC connection handle) as interposed.
> This leads to undefined ordering, which in my case runs the JCA Synch before the Hibernate Synch. This leads to a log of IJ000316 and the connection being killed.
> I think that platform specific cleanup should be executed after all application level synchronization have run, therefore it should be registered with the TM (not the TSR).
> http://www.ironjacamar.org/doc/roadto12/txtracking.html describes this as an application misbehaviour. But I don't think the application has any means of controlling the ordering in this scenario.
> If I do not provide a TSR to the TransactionIntegrationImpl (which would lead to the registration of the TransactionSynchronizer via TransactionManager - thus non-interposed) has the problem that AbstractPool uses the TSR to check if a transaction is actually in progress.
> I don't know if my rationale is correct. Could you please comment on the issue?
> Thanks!



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