[wildfly-dev] discussion about JSR352 Batch and JPA

[Clebert Suconic]

Maybe I'm getting late on the conversation.. wouldn't JMS also apply into Transactional batching?


On Sep 18, 2013, at 1:43 PM, Jason Greene <jason.greene at redhat.com> wrote:

> 
> On Sep 18, 2013, at 7:54 AM, Scott Marlow <smarlow at redhat.com> wrote:
> 
>> What are the requirements for supporting Batch section 11.6 [1]?  From 
>> looking at JSR352, I get that each "chunk" has its own JTA transaction. 
>> I previously had heard that we only supported starting the transaction 
>> from the application processing code (via UserTransaction) but I think 
>> the Batch container/runtime should start a JTA transaction for each 
>> "chunk" that is processed.  What are we really doing for managing the 
>> JTA transactions for batch?
>> 
>> 
>> REGULAR CHUNK PROCESSING & JPA
>> 
>> 
>> For the JPA support for regular chunk processing [1], the following will 
>> give a new underlying persistence context per chunk (jta tx):
>> 
>> @PersistenceContext(unitName = "chunkNonpartitionedAZTT4443334")
>> EntityManager em;
>> 
> 
> That won't work because the same block of code is executed in parallel from 2 different threads. Each chunk needs a clean entity manager.
> 
> 
> --
> Jason T. Greene
> WildFly Lead / JBoss EAP Platform Architect
> JBoss, a division of Red Hat
> 
> 
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