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

[Gunnar Morling]

2015-01-14 9:27 GMT+01:00 Emmanuel Bernard <emmanuel at hibernate.org>:

> Probably. Needs exploring.
>

https://hibernate.atlassian.net/browse/OGM-718

Btw. why has OGM its own JTATransactionManagerTransaction instead of using
ORM's existing JtaTransaction?


> > 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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