[hibernate-dev] [OGM] Transaction type "RESOURCE_LOCAL", still JTA is required

[Gunnar Morling]

2015-01-13 19:49 GMT+01:00 Steve Ebersole <steve at hibernate.org>:

> You'd need to not specify the JtaPlatform service stuff.
>

Yes, but which org.hibernate.Transaction implementation to use? We'd need a
"fake" implementation which triggers the grid dialect upon flush()/commit()
invocations.

On Tue, Jan 13, 2015 at 12:18 PM, Gunnar Morling <gunnar at hibernate.org>
> wrote:
>
>> Hi,
>>
>> For a demo I have an OGM application which defines a persistence unit with
>> transaction type RESOURCE_LOCAL.
>>
>> I thus assumed I wouldn't have to add a JTA implementation to the class
>> path, but actually I'm getting a CNFE (see [1] for the complete trace):
>>
>>     ClassNotFoundException: Could not load requested class :
>> com.arjuna.ats.jta.TransactionManager
>>
>> Indeed Arjuna is what we use as TM by default. It is set by OGM's
>> JtaPlatform implementation which in turn is used by transactions created
>> by
>> OGM's default TransactionFactory [2].
>>
>> Unless I'm doing something wrong configuration-wise, I feel that requiring
>> a JTA implementation for a non-transactional backend such as MongoDB is
>> confusing and may make users ask whether OGM is doing the right thing.
>>
>> Would it be feasible to to provide an "OGM local" TransactionImplementor +
>> TransactionFactory to be used in such cases where the store does not
>> support transactions (so no rollbacks etc.), but we'd "only" need a
>> trigger
>> for writing out changes to the datastore?
>>
>> Any thoughts?
>>
>> --Gunnar
>>
>> [1] https://gist.github.com/gunnarmorling/ba193caecb7d5cdbd0a4
>> [2]
>>
>> https://github.com/hibernate/hibernate-ogm/blob/master/core/src/main/java/org/hibernate/ogm/transaction/impl/OgmTransactionFactoryInitiator.java#L42
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>
>