A Comparative Study of Persistence Mechanisms

An interesting article from Sun Labs. If anything, the conclusion is worth a read.

"Acceptable EJB performance seems unattainable at present unless dramatic changes are made to the application object model to avoid fine-grain objects when mapped to EJB. While this approach is now reflected in standard design patterns for EJB, the extra effort that it implies is disturbing from the overall application design perspective. In contrast, JDO manages to achieve reasonable performance at much lower impact on application design, while remaining agnostic to the nature of the external data store. Therefore, at this time, JDO would seem to offer the best overall persistence mechanism for demanding, object-oriented, applications. Note, however, that at the time of writing, a new specification for entity bean persistence [Sun04] was being proposed for EJB 3.0 that would bring it much closer to JDO in spirit."