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Three-tier web application in JEE  RSS feed

 
Greenhorn
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I need to represent logical layers of my web application built with JEE specification. Is this three-tier architecture in the image below correct?

My issue is about data layer. Usualy it is rapresented as Data Access Layer, but I don't use JPA, I access to persistence data (represented by a file and a DBMS) with EJB and I rapresent them with standard Java objects. Should I do in a different way?
Thank you for your answer.
Immagine.png
[Thumbnail for Immagine.png]
Web application architecture
 
It is sorta covered in the JavaRanch Style Guide.
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