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use JB3 or Spring for a 3 tier application ?

I’m new to EJB3 and Spring technologies.  I have been reading about their difference and it seems that EJB3 solve the problems from its predecessors.  Spring solve many of problems from EJB1 and EJB2 as well.  

I’m going to develop a 3-tier application, I will have server and different clients (phones, pda, standalones, browsers, etc) are going to connect to it to retrieve data and process business logic.  Which technology should I use and what are the pros and cons of using one over the other?
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Mayank S
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>> for the presentation tier, a framework like JavaServer Faces is a good choice.

Agree.
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kevorkgt

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Thank you all for your replies.

mbvvsatish, the two books you recommended were published before EJB3 specifications were released. In addition, a lot of disadvantages of using EJB that the "Expert one-on-one j2ee development without EJB" mentions are addressed, according to what I've read so far, by the new EJB specifications.