I just fixed the problems with the ojb-block in trunk; haven't checked if they exist in 2.1.x as well.
The different implementations (PB, ODMG) all inherit from AbstractOjbImpl that in turn uses a datasource class. This datasource class is based on static methods. So if you have configured two implementations (PB and ODMG), the static methods of the datasource are called twice and this results in an error!
So there must be something wrong with this I guess ;)
Should be fixed now. I enabled all other impls back.
Vadim
