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

[Emmanuel Bernard]

Probably. Needs exploring.

> On 13 Jan 2015, at 19:18, 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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