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From "Scott Parkerson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2419) Sequence Caching Attempt Failing in JTA Managed Environments with PostgreSQL
Date Tue, 06 Aug 2013 23:39:48 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731450#comment-13731450
] 

Scott Parkerson commented on OPENJPA-2419:
------------------------------------------

Here's a possible fix on my Github: https://github.com/sgp/openjpa/commits/OPENJPA-2419. This
uses SAVEPOINT ... ROLLBACK TO instead of spawning a new connection. I think the only thing
I'd need to change is to detect if we are not in a JTA environment (and no transaction is
active) to skip even doing this.

Let me know what you think.
                
> Sequence Caching Attempt Failing in JTA Managed Environments with PostgreSQL
> ----------------------------------------------------------------------------
>
>                 Key: OPENJPA-2419
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2419
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.2.2
>         Environment: Fuse (JBoss) ESB 6.0.0-redhat-024 (Karaf 2.3.0)
> OpenJPA 2.2.2
> Apache Aries 1.0.0 (JPA/JTA/JNDI/Blueprint)
>            Reporter: Scott Parkerson
>
> About a year ago, there was a bug (OPENJPA-2196) that I contributed a patch to that deals
with cases where OpenJPA's sequence caching cannot be used if the native sequence in the database
is not owned by the role connecting to the database. This patch was included in OpenJPA 2.2.2.
> Since then, I've started using JTA-managed transactions in my container (the container
being JBoss Fuse ESB, using Aries JPA/JNDI/JTA), and have hit the following snags with my
previous fix:
> 1. When the attempt to ALTER SEQUENCE ... INCREMENT BY fails, it basically hoses the
entire transaction, causing the next thing (which is to get the next value in the sequence)
to fail because the transaction is now invalid and must be rolled back.
> 2. Trying to work around this using either ConnectionFactory2Name or the non-jta-data-source
configuration items in my persistence.xml file seems to never matter, as ALL native sequences
in OpenJPA are of type TYPE_CONTIGUOUS, and thus it will always choose the managed (jta-data-source
or ConnectionFactoryName) methods to attempt to modify the sequence. I cannot see where it
attempts to suspend the transaction, either.
> Perhaps there is a workaround, but I cannot see it. Does anyone else have any ideas on
what could be done to make this work?

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