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...