Spring Framework Or EJB3

I just come across Sun Microsystems had lunch EJB3 during Sun Java One 2006. Look very promising. I started to think should I switch my development platform from Spring Framework to EJB3.

I start download Netbeans 5.5 Beta, Netbeans Enterprise Pack 5.5 EA and Sun Java Application Server 9. Install all the products into my development PC after downloaded. Unfortunately facing a lot of problem during the testing my first EJB3 :)