Objects and Services

Clemens Vasters' post "Rows and Columns + Elements and Attributes is all you need" initiated an interesting discussion about the place of objects in SOA.

Does Object Oriented Programing fits with Service Orientation?
Read comments from Udi Dahan, Steve Eichert, and Jimmy Nilsson(1 and 2), for example.

In my opinion, the way to work with Entities, Managers, Objects and Services is still not clear. I haven't looked enough at architectures like ShadowFax or FABRIQ to know whether they contain guidance on this. My guess is that we'll have to wait some more time before best practices become clearly defined. Maybe all this is already well settled in the J2EE world?

I tend to do something similar to what Udi does. One of the open issues I see is "how to share business and validation rules between the Business layer and the Presentation layer?". If the rules are in the Managers, and not in the Entities, how do we use these rules in the Presentation layer?

Anyway, "encore un pavé dans la mare des tout-objet"...