Uses a native and naive internal Distributed Transaction Manager to enable 2-phase commit when underlying slices are XA-complaint.

Automatic Collocation Constraint : Identifies the correct slice for instances that are newly persistent by cascade. Collocation constraint requires that the closure of any object graph be stored in the same slice. In earlier version, user-defined DistributionPolicy has to ensure this constraint by returning the same slice for all the instances in the same closure. Now DistributionPolicy only needs to be implemented for root instances i.e. the instances that are explicit argument of persist() call. The cascaded instances will be automatically assigned the same slice identifier of the root instance.

Per-slice Configuration: Now each slice can be configured with separate database driver or database dictionary or any other property. The previous multi-URL configuration is no more supported.

First working version for extending OpenJPA to horizontally-partitioned, distributed database.

&homer;