Becouse EJB3 is a new topic for me i've started to think that layering is out of date for this technology and start to search something about this on the google. I found some very interesting articles where people have the same dilema about layering an application: | http://www.adam-bien.com/roller/abien/entry/to_layer_or_not_to | http://www.infoq.com/news/2007/09/jpa-dao | http://www.adam-bien.com/roller/abien/entry/jpa_ejb3_killed_the_dao | http://gleichmann.blog.com/2054653/ | | | So it seems that it is a wide topic and the matter of your application and its requirements. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117485#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...