[rules-users] JTA question

[Allen Day]

Kris,

Thanks for your reply to my post.

WebSphere Application Server does not expose the javax.transaction.TransactionManager interface to applications or application frameworks deployed into WebSphere Application Server.
http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.html

Specifically we've come to find that we cannot use the TransactionManager to:

*         Suspend Transactions

*         Register Transaction Synchronizations


Looking at the source code you referenced it appears the TransactionManager interface is only being used to register a synchronization.  Is there any other code you're aware of that uses the EnvironmentName.TRANSACTION_MANAGER?  If not this is good because Websphere 7 supports JTA 1.1 which supports the TransactionSynchronizationRegistry.  Is it possible for us to provide an alternative implementation of the SingleSessionCommandService?  We would provide an implementation that uses the TransactionSynchronizationRegistry instead of TransactionManager.  If you could point us in the right direction there that would be great.  Otherwise perhaps we could just provide a dummy TransactionManager implementation that delegates to the TransactionSynchronizationRegistry?  What do you think?

Allen


From: Mark Proctor [mailto:mproctor at codehaus.org]
Sent: Wednesday, October 28, 2009 11:12 PM
To: Rules Users List
Cc: Allen Day
Subject: Re: [rules-users] JTA question

Kris Verlaenen wrote:

Allen,



We selected JPA and JTA because they appear to be the standards for

persistence and transaction currently.  When you say incompatible, do

you mean that the WebSphere transaction manager isn't JTA compliant,

that we are using JTA features that WebSphere does not support, or that

it is a custom transaction solution?



Note that persistence and transactions is defined as an orthogonal

concern, meaning you can easily replace it by another implementation

without having to redefine everything.  I'm more than happy to work with

you on making this work on WebSphere.  If you want to take a look at our

transaction implementation, take a look at SingleSessionCommandService:

http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-persistence-jpa/src/main/java/org/drools/persistence/session/SingleSessionCommandService.java



As you can see, there are only a few calls to the transaction manager

before and after the execution of the commands (supporting both

user-defined or default transactions).  Shouldn't be too difficult to

either replace that with another transaction implementation, or make the

solution more generic to support multiple ones altogether.


I can concur that the plan was always to support other transaction models, but to target JTA first as it's an established standard. Beyond that we wanted to make sure our direction was user driven.

Mark




Kris



Quoting Allen Day <DayAK at ldschurch.org><mailto:DayAK at ldschurch.org>:





I am new to this list, so I apologize if this question has been asked

before.



It appears that drools-flow requires JTA in order to use JPA.  Is

anybody using drools-flow running on WebSphere, because WebSphere

uses its' own transaction manager (and the two don't seem

compatible).  Has anybody looked at the feature request to provide

support for resource local transactions -

https://jira.jboss.org/jira/browse/JBRULES-2289



We need to decide soon between Drools Flow & JBPM, and this issue

could swing in JBPM's favor.



Thanks,

  Allen









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