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Is there anybody read the sample "ESite"??

Sean Li
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I've been reading this sample these days to learn how to build a J2EE application. But I losed my way in this sample. The structure is too complicated.
First, establish 3 entity beans.
Second, use a stateless session bean named ServerDateModule to use the established entity beans.
Third, use a stateful session bean named Cart to use the stateless bean
then in the web layer, use a ClientDateModule bean to connect the session bean Cart
then again, use a bean named SessionBean to use the ClientDateModule
finally, use servlet and Jsp to use the SessionBean
Why so complicated? Borland JBuilder use a lot of their own technique to implement this sample, such as EntityBeanProvider, EntityBeanResolver, DataSet..., and they claim that will improve the efficiency. really??
I don't know if this kind of structure is popular in design a J2EE application. Because I'm a newbie, i do need advice from expert. help me!
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